diff --git a/setup.c b/setup.c
index 424716be8c..021d0133ae 100644
--- a/setup.c
+++ b/setup.c
@@ -414,6 +414,15 @@ static const char *setup_discovered_git_dir(const char *gitdir,
 	if (check_repository_format_gently(gitdir, nongit_ok))
 		return NULL;
 
+	/* --work-tree is set without --git-dir; use discovered one */
+	if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
+		if (offset != len && !is_absolute_path(gitdir))
+			gitdir = xstrdup(make_absolute_path(gitdir));
+		if (chdir(cwd))
+			die_errno("Could not come back to cwd");
+		return setup_explicit_git_dir(gitdir, cwd, len, nongit_ok);
+	}
+
 	/* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */
 	if (is_bare_repository_cfg > 0) {
 		set_git_dir(offset == len ? gitdir : make_absolute_path(gitdir));
@@ -446,6 +455,16 @@ static const char *setup_bare_git_dir(char *cwd, int offset, int len, int *nongi
 	if (check_repository_format_gently(".", nongit_ok))
 		return NULL;
 
+	/* --work-tree is set without --git-dir; use discovered one */
+	if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
+		const char *gitdir;
+
+		gitdir = offset == len ? "." : xmemdupz(cwd, offset);
+		if (chdir(cwd))
+			die_errno("Could not come back to cwd");
+		return setup_explicit_git_dir(gitdir, cwd, len, nongit_ok);
+	}
+
 	inside_git_dir = 1;
 	inside_work_tree = 0;
 	if (offset != len) {
diff --git a/t/t1510-repo-setup.sh b/t/t1510-repo-setup.sh
index e9c451cc58..dcc0f86bd8 100755
--- a/t/t1510-repo-setup.sh
+++ b/t/t1510-repo-setup.sh
@@ -1,56 +1,223 @@
 #!/bin/sh
 
-test_description='Tests of cwd/prefix/worktree/gitdir setup in all cases'
+test_description="Tests of cwd/prefix/worktree/gitdir setup in all cases
 
+A few rules for repo setup:
+
+1. GIT_DIR is relative to user's cwd. --git-dir is equivalent to
+   GIT_DIR.
+
+2. .git file is relative to parent directory. .git file is basically
+   symlink in disguise. The directory where .git file points to will
+   become new git_dir.
+
+3. core.worktree is relative to git_dir.
+
+4. GIT_WORK_TREE is relative to user's cwd. --work-tree is
+   equivalent to GIT_WORK_TREE.
+
+5. GIT_WORK_TREE/core.worktree was originally meant to work only if
+   GIT_DIR is set, but earlier git didn't enforce it, and some scripts
+   depend on the implementation that happened to first discover .git by
+   going up from the users $cwd and then using the specified working tree
+   that may or may not have any relation to where .git was found in.  This
+   historical behaviour must be kept.
+
+6. Effective GIT_WORK_TREE overrides core.worktree and core.bare
+
+7. Effective core.worktree conflicts with core.bare
+
+8. If GIT_DIR is set but neither worktree nor bare setting is given,
+   original cwd becomes worktree.
+
+9. If .git discovery is done inside a repo, the repo becomes a bare
+   repo. .git discovery is performed if GIT_DIR is not set.
+
+10. If no worktree is available, cwd remains unchanged, prefix is
+    NULL.
+
+11. When user's cwd is outside worktree, cwd remains unchanged,
+    prefix is NULL.
+"
 . ./test-lib.sh
 
-#
-# A few rules for repo setup:
-#
-# 1. GIT_DIR is relative to user's cwd. --git-dir is equivalent to
-#    GIT_DIR.
-#
-# 2. .git file is relative to parent directory. .git file is basically
-#    symlink in disguise. The directory where .git file points to will
-#    become new git_dir.
-#
-# 3. core.worktree is relative to git_dir.
-#
-# 4. GIT_WORK_TREE is relative to user's cwd. --work-tree is
-#    equivalent to GIT_WORK_TREE.
-#
-# 5. GIT_WORK_TREE/core.worktree is only effective if GIT_DIR is set
-#    Uneffective worktree settings should be warned.
-#
-# 6. Effective GIT_WORK_TREE overrides core.worktree and core.bare
-#
-# 7. Effective core.worktree conflicts with core.bare
-#
-# 8. If GIT_DIR is set but neither worktree nor bare setting is given,
-#    original cwd becomes worktree.
-#
-# 9. If .git discovery is done inside a repo, the repo becomes a bare
-#    repo. .git discovery is performed if GIT_DIR is not set.
-#
-# 10. If no worktree is available, cwd remains unchanged, prefix is
-#     NULL.
-#
-# 11. When user's cwd is outside worktree, cwd remains unchanged,
-#     prefix is NULL.
-#
+here=$(pwd)
 
-test_repo() {
+test_repo () {
 	(
-	cd "$1" &&
-	if test -n "$2"; then GIT_DIR="$2" && export GIT_DIR; fi &&
-	if test -n "$3"; then GIT_WORK_TREE="$3" && export GIT_WORK_TREE; fi &&
-	rm -f trace &&
-	GIT_TRACE="`pwd`/trace" git symbolic-ref HEAD >/dev/null &&
-	grep '^setup: ' trace >result &&
-	test_cmp expected result
+		cd "$1" &&
+		if test -n "$2"
+		then
+			GIT_DIR="$2" &&
+			export GIT_DIR
+		fi &&
+		if test -n "$3"
+		then
+			GIT_WORK_TREE="$3" &&
+			export GIT_WORK_TREE
+		fi &&
+		rm -f trace &&
+		GIT_TRACE="$(pwd)/trace" git symbolic-ref HEAD >/dev/null &&
+		grep '^setup: ' trace >result &&
+		test_cmp expected result
 	)
 }
 
+maybe_config () {
+	file=$1 var=$2 value=$3 &&
+	if test "$value" != unset
+	then
+		git config --file="$file" "$var" "$value"
+	fi
+}
+
+setup_repo () {
+	name=$1 worktreecfg=$2 gitfile=$3 barecfg=$4 &&
+	sane_unset GIT_DIR GIT_WORK_TREE &&
+
+	git init "$name" &&
+	maybe_config "$name/.git/config" core.worktree "$worktreecfg" &&
+	maybe_config "$name/.git/config" core.bare "$barecfg" &&
+	mkdir -p "$name/sub/sub" &&
+
+	if test "${gitfile:+set}"
+	then
+		mv "$name/.git" "$name.git" &&
+		echo "gitdir: ../$name.git" >"$name/.git"
+	fi
+}
+
+maybe_set () {
+	var=$1 value=$2 &&
+	if test "$value" != unset
+	then
+		eval "$var=\$value" &&
+		export $var
+	fi
+}
+
+setup_env () {
+	worktreenv=$1 gitdirenv=$2 &&
+	sane_unset GIT_DIR GIT_WORK_TREE &&
+	maybe_set GIT_DIR "$gitdirenv" &&
+	maybe_set GIT_WORK_TREE "$worktreeenv"
+}
+
+expect () {
+	cat >"$1/expected" <<-EOF
+	setup: git_dir: $2
+	setup: worktree: $3
+	setup: cwd: $4
+	setup: prefix: $5
+	EOF
+}
+
+try_case () {
+	name=$1 worktreeenv=$2 gitdirenv=$3 &&
+	setup_env "$worktreeenv" "$gitdirenv" &&
+	expect "$name" "$4" "$5" "$6" "$7" &&
+	test_repo "$name"
+}
+
+run_wt_tests () {
+	N=$1 gitfile=$2
+
+	absgit="$here/$N/.git"
+	dotgit=.git
+	dotdotgit=../../.git
+
+	if test "$gitfile"
+	then
+		absgit="$here/$N.git"
+		dotgit=$absgit dotdotgit=$absgit
+	fi
+
+	test_expect_success "#$N: explicit GIT_WORK_TREE and GIT_DIR at toplevel" '
+		try_case $N "$here/$N" .git \
+			"$dotgit" "$here/$N" "$here/$N" "(null)" &&
+		try_case $N . .git \
+			"$dotgit" "$here/$N" "$here/$N" "(null)" &&
+		try_case $N "$here/$N" "$here/$N/.git" \
+			"$absgit" "$here/$N" "$here/$N" "(null)" &&
+		try_case $N . "$here/$N/.git" \
+			"$absgit" "$here/$N" "$here/$N" "(null)"
+	'
+
+	test_expect_success "#$N: explicit GIT_WORK_TREE and GIT_DIR in subdir" '
+		try_case $N/sub/sub "$here/$N" ../../.git \
+			"$absgit" "$here/$N" "$here/$N" sub/sub/ &&
+		try_case $N/sub/sub ../.. ../../.git \
+			"$absgit" "$here/$N" "$here/$N" sub/sub/ &&
+		try_case $N/sub/sub "$here/$N" "$here/$N/.git" \
+			"$absgit" "$here/$N" "$here/$N" sub/sub/ &&
+		try_case $N/sub/sub ../.. "$here/$N/.git" \
+			"$absgit" "$here/$N" "$here/$N" sub/sub/
+	'
+
+	test_expect_success "#$N: explicit GIT_WORK_TREE from parent of worktree" '
+		try_case $N "$here/$N/wt" .git \
+			"$dotgit" "$here/$N/wt" "$here/$N" "(null)" &&
+		try_case $N wt .git \
+			"$dotgit" "$here/$N/wt" "$here/$N" "(null)" &&
+		try_case $N wt "$here/$N/.git" \
+			"$absgit" "$here/$N/wt" "$here/$N" "(null)" &&
+		try_case $N "$here/$N/wt" "$here/$N/.git" \
+			"$absgit" "$here/$N/wt" "$here/$N" "(null)"
+	'
+
+	test_expect_success "#$N: explicit GIT_WORK_TREE from nephew of worktree" '
+		try_case $N/sub/sub "$here/$N/wt" ../../.git \
+			"$dotdotgit" "$here/$N/wt" "$here/$N/sub/sub" "(null)" &&
+		try_case $N/sub/sub ../../wt ../../.git \
+			"$dotdotgit" "$here/$N/wt" "$here/$N/sub/sub" "(null)" &&
+		try_case $N/sub/sub ../../wt "$here/$N/.git" \
+			"$absgit" "$here/$N/wt" "$here/$N/sub/sub" "(null)" &&
+		try_case $N/sub/sub "$here/$N/wt" "$here/$N/.git" \
+			"$absgit" "$here/$N/wt" "$here/$N/sub/sub" "(null)"
+	'
+
+	test_expect_success "#$N: chdir_to_toplevel uses worktree, not git dir" '
+		try_case $N "$here" .git \
+			"$absgit" "$here" "$here" $N/ &&
+		try_case $N .. .git \
+			"$absgit" "$here" "$here" $N/ &&
+		try_case $N .. "$here/$N/.git" \
+			"$absgit" "$here" "$here" $N/ &&
+		try_case $N "$here" "$here/$N/.git" \
+			"$absgit" "$here" "$here" $N/
+	'
+
+	test_expect_success "#$N: chdir_to_toplevel uses worktree (from subdir)" '
+		try_case $N/sub/sub "$here" ../../.git \
+			"$absgit" "$here" "$here" $N/sub/sub/ &&
+		try_case $N/sub/sub ../../.. ../../.git \
+			"$absgit" "$here" "$here" $N/sub/sub/ &&
+		try_case $N/sub/sub ../../../ "$here/$N/.git" \
+			"$absgit" "$here" "$here" $N/sub/sub/ &&
+		try_case $N/sub/sub "$here" "$here/$N/.git" \
+			"$absgit" "$here" "$here" $N/sub/sub/
+	'
+}
+
+# try_repo #c GIT_WORK_TREE GIT_DIR core.worktree .gitfile? core.bare \
+#	(git dir) (work tree) (cwd) (prefix) \	<-- at toplevel
+#	(git dir) (work tree) (cwd) (prefix)	<-- from subdir
+try_repo () {
+	name=$1 worktreeenv=$2 gitdirenv=$3 &&
+	setup_repo "$name" "$4" "$5" "$6" &&
+	shift 6 &&
+	try_case "$name" "$worktreeenv" "$gitdirenv" \
+		"$1" "$2" "$3" "$4" &&
+	shift 4 &&
+	case "$gitdirenv" in
+	/* | ?:/* | unset) ;;
+	*)
+		gitdirenv=../$gitdirenv ;;
+	esac &&
+	try_case "$name/sub" "$worktreeenv" "$gitdirenv" \
+		"$1" "$2" "$3" "$4"
+}
+
 # Bit 0 = GIT_WORK_TREE
 # Bit 1 = GIT_DIR
 # Bit 2 = core.worktree
@@ -58,4476 +225,552 @@ test_repo() {
 # Bit 4 = bare repo
 # Case# = encoding of the above 5 bits
 
-#
-# Case #0
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is not set
-#  - GIT_DIR is not set
-#  - core.worktree is not set
-#  - .git is a directory
-#  - core.bare is not set, cwd is outside .git
-#
-# Output:
-#
-#  - worktree is .git's parent directory
-#  - cwd is at worktree root dir
-#  - prefix is calculated
-#  - git_dir is set to ".git"
-#  - cwd can't be outside worktree
-
-test_expect_success '#0: setup' '
-	sane_unset GIT_DIR GIT_WORK_TREE &&
-	mkdir 0 0/sub &&
-	(cd 0 && git init) &&
-	here=$(pwd)
+test_expect_success '#0: nonbare repo, no explicit configuration' '
+	try_repo 0 unset unset unset "" unset \
+		.git "$here/0" "$here/0" "(null)" \
+		.git "$here/0" "$here/0" sub/ 2>message &&
+	! test -s message
 '
 
-test_expect_success '#0: at root' '
-	cat >0/expected <<EOF &&
-setup: git_dir: .git
-setup: worktree: $here/0
-setup: cwd: $here/0
-setup: prefix: (null)
-EOF
-	test_repo 0
+test_expect_success '#1: GIT_WORK_TREE without explicit GIT_DIR is accepted' '
+	mkdir -p wt &&
+	try_repo 1 "$here" unset unset "" unset \
+		"$here/1/.git" "$here" "$here" 1/ \
+		"$here/1/.git" "$here" "$here" 1/sub/ 2>message &&
+	! test -s message
 '
 
-test_expect_success '#0: in subdir' '
-	cat >0/sub/expected <<EOF &&
-setup: git_dir: .git
-setup: worktree: $here/0
-setup: cwd: $here/0
-setup: prefix: sub/
-EOF
-	test_repo 0/sub
+test_expect_success '#2: worktree defaults to cwd with explicit GIT_DIR' '
+	try_repo 2 unset "$here/2/.git" unset "" unset \
+		"$here/2/.git" "$here/2" "$here/2" "(null)" \
+		"$here/2/.git" "$here/2/sub" "$here/2/sub" "(null)"
 '
 
-#
-# case #1
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is set
-#  - GIT_DIR is not set
-#  - core.worktree is not set
-#  - .git is a directory
-#  - core.bare is not set, cwd is outside .git
-#
-# Output:
-#
-# GIT_WORK_TREE is ignored -> #0
-
-test_expect_success '#1: setup' '
-	sane_unset GIT_DIR GIT_WORK_TREE &&
-	mkdir 1 1/sub 1.wt 1.wt/sub 1/wt 1/wt/sub &&
-	cd 1 &&
-	git init &&
-	GIT_WORK_TREE=non-existent &&
-	export GIT_WORK_TREE &&
-	cd ..
+test_expect_success '#2b: relative GIT_DIR' '
+	try_repo 2b unset ".git" unset "" unset \
+		".git" "$here/2b" "$here/2b" "(null)" \
+		"../.git" "$here/2b/sub" "$here/2b/sub" "(null)"
 '
 
-test_expect_success '#1: at root' '
-	cat >1/expected <<EOF &&
-setup: git_dir: .git
-setup: worktree: $here/1
-setup: cwd: $here/1
-setup: prefix: (null)
-EOF
-	test_repo 1
-'
-
-test_expect_success '#1: in subdir' '
-	cat >1/sub/expected <<EOF &&
-setup: git_dir: .git
-setup: worktree: $here/1
-setup: cwd: $here/1
-setup: prefix: sub/
-EOF
-	test_repo 1/sub
-'
-
-#
-# case #2
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is not set
-#  - GIT_DIR is set
-#  - core.worktree is not set
-#  - .git is a directory
-#  - core.bare is not set, cwd is outside .git
-#
-# Output:
-#
-#  - worktree is at original cwd
-#  - cwd is unchanged
-#  - prefix is NULL
-#  - git_dir is set to $GIT_DIR
-#  - cwd can't be outside worktree
-
-test_expect_success '#2: setup' '
-	sane_unset GIT_DIR GIT_WORK_TREE &&
-	mkdir 2 2/sub &&
-	cd 2 && git init && cd ..
-'
-
-test_expect_success '#2: at root' '
-	cat >2/expected <<EOF &&
-setup: git_dir: $here/2/.git
-setup: worktree: $here/2
-setup: cwd: $here/2
-setup: prefix: (null)
-EOF
-	test_repo 2 "$here/2/.git"
-'
-
-test_expect_success '#2: in subdir' '
-	cat >2/sub/expected <<EOF &&
-setup: git_dir: $here/2/.git
-setup: worktree: $here/2/sub
-setup: cwd: $here/2/sub
-setup: prefix: (null)
-EOF
-	test_repo 2/sub "$here/2/.git"
-'
-
-test_expect_success '#2: relative GIT_DIR at root' '
-	cat >2/expected <<EOF &&
-setup: git_dir: .git
-setup: worktree: $here/2
-setup: cwd: $here/2
-setup: prefix: (null)
-EOF
-	test_repo 2 .git
-'
-
-test_expect_success '#2: relative GIT_DIR in subdir' '
-	cat >2/sub/expected <<EOF &&
-setup: git_dir: ../.git
-setup: worktree: $here/2/sub
-setup: cwd: $here/2/sub
-setup: prefix: (null)
-EOF
-	test_repo 2/sub ../.git
-'
-
-#
-# case #3
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is set
-#  - GIT_DIR is set
-#  - core.worktree is not set
-#  - .git is a directory
-#  - core.bare is not set, cwd is outside .git
-#
-# Output:
-#
-#  - worktree is set to $GIT_WORK_TREE
-#  - cwd is at worktree root
-#  - prefix is calculated
-#  - git_dir is set to $GIT_DIR
-#  - cwd can be outside worktree
-
 test_expect_success '#3: setup' '
-	sane_unset GIT_DIR GIT_WORK_TREE &&
-	mkdir 3 3/sub 3/sub/sub 3.wt 3.wt/sub 3/wt 3/wt/sub &&
-	cd 3 && git init && cd ..
+	setup_repo 3 unset "" unset &&
+	mkdir -p 3/sub/sub 3/wt/sub
+'
+run_wt_tests 3
+
+test_expect_success '#4: core.worktree without GIT_DIR set is accepted' '
+	setup_repo 4 ../sub "" unset &&
+	mkdir -p 4/sub sub &&
+	try_case 4 unset unset \
+		.git "$here/4/sub" "$here/4" "(null)" \
+		"$here/4/.git" "$here/4/sub" "$here/4/sub" "(null)" 2>message &&
+	! test -s message
 '
 
-test_expect_success '#3: GIT_DIR(rel), GIT_WORK_TREE=root at root' '
-	cat >3/expected <<EOF &&
-setup: git_dir: .git
-setup: worktree: $here/3
-setup: cwd: $here/3
-setup: prefix: (null)
-EOF
-	test_repo 3 .git "$here/3"
+test_expect_success '#5: core.worktree + GIT_WORK_TREE is accepted' '
+	# or: you cannot intimidate away the lack of GIT_DIR setting
+	try_repo 5 "$here" unset "$here/5" "" unset \
+		"$here/5/.git" "$here" "$here" 5/ \
+		"$here/5/.git" "$here" "$here" 5/sub/ 2>message &&
+	try_repo 5a .. unset "$here/5a" "" unset \
+		"$here/5a/.git" "$here" "$here" 5a/ \
+		"$here/5a/.git" "$here/5a" "$here/5a" sub/ &&
+	! test -s message
 '
 
-test_expect_success '#3: GIT_DIR(rel), GIT_WORK_TREE=root(rel) at root' '
-	cat >3/expected <<EOF &&
-setup: git_dir: .git
-setup: worktree: $here/3
-setup: cwd: $here/3
-setup: prefix: (null)
-EOF
-	test_repo 3 .git .
+test_expect_success '#6: setting GIT_DIR brings core.worktree to life' '
+	setup_repo 6 "$here/6" "" unset &&
+	try_case 6 unset .git \
+		.git "$here/6" "$here/6" "(null)" &&
+	try_case 6 unset "$here/6/.git" \
+		"$here/6/.git" "$here/6" "$here/6" "(null)" &&
+	try_case 6/sub/sub unset ../../.git \
+		"$here/6/.git" "$here/6" "$here/6" sub/sub/ &&
+	try_case 6/sub/sub unset "$here/6/.git" \
+		"$here/6/.git" "$here/6" "$here/6" sub/sub/
 '
 
-test_expect_success '#3: GIT_DIR, GIT_WORK_TREE=root at root' '
-	cat >3/expected <<EOF &&
-setup: git_dir: $here/3/.git
-setup: worktree: $here/3
-setup: cwd: $here/3
-setup: prefix: (null)
-EOF
-	test_repo 3 "$here/3/.git" "$here/3"
+test_expect_success '#6b: GIT_DIR set, core.worktree relative' '
+	setup_repo 6b .. "" unset &&
+	try_case 6b unset .git \
+		.git "$here/6b" "$here/6b" "(null)" &&
+	try_case 6b unset "$here/6b/.git" \
+		"$here/6b/.git" "$here/6b" "$here/6b" "(null)" &&
+	try_case 6b/sub/sub unset ../../.git \
+		"$here/6b/.git" "$here/6b" "$here/6b" sub/sub/ &&
+	try_case 6b/sub/sub unset "$here/6b/.git" \
+		"$here/6b/.git" "$here/6b" "$here/6b" sub/sub/
 '
 
-test_expect_success '#3: GIT_DIR, GIT_WORK_TREE=root(rel) at root' '
-	cat >3/expected <<EOF &&
-setup: git_dir: $here/3/.git
-setup: worktree: $here/3
-setup: cwd: $here/3
-setup: prefix: (null)
-EOF
-	test_repo 3 "$here/3/.git" .
+test_expect_success '#6c: GIT_DIR set, core.worktree=../wt (absolute)' '
+	setup_repo 6c "$here/6c/wt" "" unset &&
+	mkdir -p 6c/wt/sub &&
+
+	try_case 6c unset .git \
+		.git "$here/6c/wt" "$here/6c" "(null)" &&
+	try_case 6c unset "$here/6c/.git" \
+		"$here/6c/.git" "$here/6c/wt" "$here/6c" "(null)" &&
+	try_case 6c/sub/sub unset ../../.git \
+		../../.git "$here/6c/wt" "$here/6c/sub/sub" "(null)" &&
+	try_case 6c/sub/sub unset "$here/6c/.git" \
+		"$here/6c/.git" "$here/6c/wt" "$here/6c/sub/sub" "(null)"
 '
 
-test_expect_success '#3: GIT_DIR(rel), GIT_WORKTREE=root in subdir' '
-	cat >3/sub/sub/expected <<EOF &&
-setup: git_dir: $here/3/.git
-setup: worktree: $here/3
-setup: cwd: $here/3
-setup: prefix: sub/sub/
-EOF
-	test_repo 3/sub/sub ../../.git "$here/3"
+test_expect_success '#6d: GIT_DIR set, core.worktree=../wt (relative)' '
+	setup_repo 6d "$here/6d/wt" "" unset &&
+	mkdir -p 6d/wt/sub &&
+
+	try_case 6d unset .git \
+		.git "$here/6d/wt" "$here/6d" "(null)" &&
+	try_case 6d unset "$here/6d/.git" \
+		"$here/6d/.git" "$here/6d/wt" "$here/6d" "(null)" &&
+	try_case 6d/sub/sub unset ../../.git \
+		../../.git "$here/6d/wt" "$here/6d/sub/sub" "(null)" &&
+	try_case 6d/sub/sub unset "$here/6d/.git" \
+		"$here/6d/.git" "$here/6d/wt" "$here/6d/sub/sub" "(null)"
 '
 
-test_expect_success '#3: GIT_DIR(rel), GIT_WORKTREE=root(rel) in subdir' '
-	cat >3/sub/sub/expected <<EOF &&
-setup: git_dir: $here/3/.git
-setup: worktree: $here/3
-setup: cwd: $here/3
-setup: prefix: sub/sub/
-EOF
-	test_repo 3/sub/sub ../../.git ../..
+test_expect_success '#6e: GIT_DIR set, core.worktree=../.. (absolute)' '
+	setup_repo 6e "$here" "" unset &&
+	try_case 6e unset .git \
+		"$here/6e/.git" "$here" "$here" 6e/ &&
+	try_case 6e unset "$here/6e/.git" \
+		"$here/6e/.git" "$here" "$here" 6e/ &&
+	try_case 6e/sub/sub unset ../../.git \
+		"$here/6e/.git" "$here" "$here" 6e/sub/sub/ &&
+	try_case 6e/sub/sub unset "$here/6e/.git" \
+		"$here/6e/.git" "$here" "$here" 6e/sub/sub/
 '
 
-test_expect_success '#3: GIT_DIR, GIT_WORKTREE=root in subdir' '
-	cat >3/sub/expected <<EOF &&
-setup: git_dir: $here/3/.git
-setup: worktree: $here/3
-setup: cwd: $here/3
-setup: prefix: sub/
-EOF
-	test_repo 3/sub "$here/3/.git" "$here/3"
+test_expect_success '#6f: GIT_DIR set, core.worktree=../.. (relative)' '
+	setup_repo 6f ../../ "" unset &&
+	try_case 6f unset .git \
+		"$here/6f/.git" "$here" "$here" 6f/ &&
+	try_case 6f unset "$here/6f/.git" \
+		"$here/6f/.git" "$here" "$here" 6f/ &&
+	try_case 6f/sub/sub unset ../../.git \
+		"$here/6f/.git" "$here" "$here" 6f/sub/sub/ &&
+	try_case 6f/sub/sub unset "$here/6f/.git" \
+		"$here/6f/.git" "$here" "$here" 6f/sub/sub/
 '
 
-test_expect_success '#3: GIT_DIR, GIT_WORKTREE=root(rel) in subdir' '
-	cat >3/sub/sub/expected <<EOF &&
-setup: git_dir: $here/3/.git
-setup: worktree: $here/3
-setup: cwd: $here/3
-setup: prefix: sub/sub/
-EOF
-	test_repo 3/sub/sub "$here/3/.git" ../..
-'
-
-test_expect_success '#3: GIT_DIR(rel), GIT_WORK_TREE=wt at root' '
-	cat >3/expected <<EOF &&
-setup: git_dir: .git
-setup: worktree: $here/3/wt
-setup: cwd: $here/3
-setup: prefix: (null)
-EOF
-	test_repo 3 .git "$here/3/wt"
-'
-
-test_expect_success '#3: GIT_DIR(rel), GIT_WORK_TREE=wt(rel) at root' '
-	cat >3/expected <<EOF &&
-setup: git_dir: .git
-setup: worktree: $here/3/wt
-setup: cwd: $here/3
-setup: prefix: (null)
-EOF
-	test_repo 3 .git wt
-'
-
-test_expect_success '#3: GIT_DIR, GIT_WORK_TREE=wt(rel) at root' '
-	cat >3/expected <<EOF &&
-setup: git_dir: $here/3/.git
-setup: worktree: $here/3/wt
-setup: cwd: $here/3
-setup: prefix: (null)
-EOF
-	test_repo 3 "$here/3/.git" wt
-'
-
-test_expect_success '#3: GIT_DIR, GIT_WORK_TREE=wt at root' '
-	cat >3/expected <<EOF &&
-setup: git_dir: $here/3/.git
-setup: worktree: $here/3/wt
-setup: cwd: $here/3
-setup: prefix: (null)
-EOF
-	test_repo 3 "$here/3/.git" "$here/3/wt"
-'
-
-test_expect_success '#3: GIT_DIR(rel), GIT_WORK_TREE=wt in subdir' '
-	cat >3/sub/sub/expected <<EOF &&
-setup: git_dir: ../../.git
-setup: worktree: $here/3/wt
-setup: cwd: $here/3/sub/sub
-setup: prefix: (null)
-EOF
-	test_repo 3/sub/sub ../../.git "$here/3/wt"
-'
-
-test_expect_success '#3: GIT_DIR(rel), GIT_WORK_TREE=wt(rel) in subdir' '
-	cat >3/sub/sub/expected <<EOF &&
-setup: git_dir: ../../.git
-setup: worktree: $here/3/wt
-setup: cwd: $here/3/sub/sub
-setup: prefix: (null)
-EOF
-	test_repo 3/sub/sub ../../.git ../../wt
-'
-
-test_expect_success '#3: GIT_DIR, GIT_WORK_TREE=wt(rel) in subdir' '
-	cat >3/sub/sub/expected <<EOF &&
-setup: git_dir: $here/3/.git
-setup: worktree: $here/3/wt
-setup: cwd: $here/3/sub/sub
-setup: prefix: (null)
-EOF
-	test_repo 3/sub/sub "$here/3/.git" ../../wt
-'
-
-test_expect_success '#3: GIT_DIR, GIT_WORK_TREE=wt in subdir' '
-	cat >3/sub/sub/expected <<EOF &&
-setup: git_dir: $here/3/.git
-setup: worktree: $here/3/wt
-setup: cwd: $here/3/sub/sub
-setup: prefix: (null)
-EOF
-	test_repo 3/sub/sub "$here/3/.git" "$here/3/wt"
-'
-
-test_expect_success '#3: GIT_DIR(rel), GIT_WORK_TREE=.. at root' '
-	cat >3/expected <<EOF &&
-setup: git_dir: $here/3/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 3/
-EOF
-	test_repo 3 .git "$here"
-'
-
-test_expect_success '#3: GIT_DIR(rel), GIT_WORK_TREE=..(rel) at root' '
-	cat >3/expected <<EOF &&
-setup: git_dir: $here/3/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 3/
-EOF
-	test_repo 3 .git ..
-'
-
-test_expect_success '#3: GIT_DIR, GIT_WORK_TREE=..(rel) at root' '
-	cat >3/expected <<EOF &&
-setup: git_dir: $here/3/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 3/
-EOF
-	test_repo 3 "$here/3/.git" ..
-'
-
-test_expect_success '#3: GIT_DIR, GIT_WORK_TREE=.. at root' '
-	cat >3/expected <<EOF &&
-setup: git_dir: $here/3/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 3/
-EOF
-	test_repo 3 "$here/3/.git" "$here"
-'
-
-test_expect_success '#3: GIT_DIR(rel), GIT_WORK_TREE=.. in subdir' '
-	cat >3/sub/sub/expected <<EOF &&
-setup: git_dir: $here/3/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 3/sub/sub/
-EOF
-	test_repo 3/sub/sub ../../.git "$here"
-'
-
-test_expect_success '#3: GIT_DIR(rel), GIT_WORK_TREE=..(rel) in subdir' '
-	cat >3/sub/sub/expected <<EOF &&
-setup: git_dir: $here/3/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 3/sub/sub/
-EOF
-	test_repo 3/sub/sub ../../.git ../../..
-'
-
-test_expect_success '#3: GIT_DIR, GIT_WORK_TREE=..(rel) in subdir' '
-	cat >3/sub/sub/expected <<EOF &&
-setup: git_dir: $here/3/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 3/sub/sub/
-EOF
-	test_repo 3/sub/sub "$here/3/.git" ../../../
-'
-
-test_expect_success '#3: GIT_DIR, GIT_WORK_TREE=.. in subdir' '
-	cat >3/sub/sub/expected <<EOF &&
-setup: git_dir: $here/3/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 3/sub/sub/
-EOF
-	test_repo 3/sub/sub "$here/3/.git" "$here"
-'
-
-#
-# case #4
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is not set
-#  - GIT_DIR is not set
-#  - core.worktree is set
-#  - .git is a directory
-#  - core.bare is not set, cwd is outside .git
-#
-# Output:
-#
-# core.worktree is ignored -> #0
-
-test_expect_success '#4: setup' '
-	sane_unset GIT_DIR GIT_WORK_TREE &&
-	mkdir 4 4/sub &&
-	cd 4 &&
-	git init &&
-	git config core.worktree non-existent &&
-	cd ..
-'
-
-test_expect_success '#4: at root' '
-	cat >4/expected <<EOF &&
-setup: git_dir: .git
-setup: worktree: $here/4
-setup: cwd: $here/4
-setup: prefix: (null)
-EOF
-	test_repo 4
-'
-
-test_expect_success '#4: in subdir' '
-	cat >4/sub/expected <<EOF &&
-setup: git_dir: .git
-setup: worktree: $here/4
-setup: cwd: $here/4
-setup: prefix: sub/
-EOF
-	test_repo 4/sub
-'
-
-#
-# case #5
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is set
-#  - GIT_DIR is not set
-#  - core.worktree is set
-#  - .git is a directory
-#  - core.bare is not set, cwd is outside .git
-#
-# Output:
-#
-# GIT_WORK_TREE/core.worktree are ignored -> #0
-
-test_expect_success '#5: setup' '
-	sane_unset GIT_DIR GIT_WORK_TREE &&
-	mkdir 5 5/sub &&
-	cd 5 &&
-	git init &&
-	git config core.worktree non-existent &&
-	GIT_WORK_TREE=non-existent-too &&
-	export GIT_WORK_TREE &&
-	cd ..
-'
-
-test_expect_success '#5: at root' '
-	cat >5/expected <<EOF &&
-setup: git_dir: .git
-setup: worktree: $here/5
-setup: cwd: $here/5
-setup: prefix: (null)
-EOF
-	test_repo 5
-'
-
-test_expect_success '#5: in subdir' '
-	cat >5/sub/expected <<EOF &&
-setup: git_dir: .git
-setup: worktree: $here/5
-setup: cwd: $here/5
-setup: prefix: sub/
-EOF
-	test_repo 5/sub
-'
-
-#
-# case #6
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is not set
-#  - GIT_DIR is set
-#  - core.worktree is set
-#  - .git is a directory
-#  - core.bare is not set, cwd is outside .git
-#
-# Output:
-#
-#  - worktree is at core.worktree
-#  - cwd is at worktree root
-#  - prefix is calculated
-#  - git_dir is at $GIT_DIR
-#  - cwd can be outside worktree
-
-test_expect_success '#6: setup' '
-	sane_unset GIT_DIR GIT_WORK_TREE &&
-	mkdir 6 6/sub 6/sub/sub 6.wt 6.wt/sub 6/wt 6/wt/sub &&
-	cd 6 && git init && cd ..
-'
-
-test_expect_success '#6: GIT_DIR(rel), core.worktree=.. at root' '
-	cat >6/expected <<EOF &&
-setup: git_dir: .git
-setup: worktree: $here/6
-setup: cwd: $here/6
-setup: prefix: (null)
-EOF
-	git config --file="$here/6/.git/config" core.worktree "$here/6" &&
-	test_repo 6 .git
-'
-
-test_expect_success '#6: GIT_DIR(rel), core.worktree=..(rel) at root' '
-	cat >6/expected <<EOF &&
-setup: git_dir: .git
-setup: worktree: $here/6
-setup: cwd: $here/6
-setup: prefix: (null)
-EOF
-	git config --file="$here/6/.git/config" core.worktree .. &&
-	test_repo 6 .git
-'
-
-test_expect_success '#6: GIT_DIR, core.worktree=.. at root' '
-	cat >6/expected <<EOF &&
-setup: git_dir: $here/6/.git
-setup: worktree: $here/6
-setup: cwd: $here/6
-setup: prefix: (null)
-EOF
-	git config --file="$here/6/.git/config" core.worktree "$here/6" &&
-	test_repo 6 "$here/6/.git"
-'
-
-test_expect_success '#6: GIT_DIR, core.worktree=..(rel) at root' '
-	cat >6/expected <<EOF &&
-setup: git_dir: $here/6/.git
-setup: worktree: $here/6
-setup: cwd: $here/6
-setup: prefix: (null)
-EOF
-	git config --file="$here/6/.git/config" core.worktree .. &&
-	test_repo 6 "$here/6/.git"
-'
-
-test_expect_success '#6: GIT_DIR(rel), core.worktree=.. in subdir' '
-	cat >6/sub/sub/expected <<EOF &&
-setup: git_dir: $here/6/.git
-setup: worktree: $here/6
-setup: cwd: $here/6
-setup: prefix: sub/sub/
-EOF
-	git config --file="$here/6/.git/config" core.worktree "$here/6" &&
-	test_repo 6/sub/sub ../../.git
-'
-
-test_expect_success '#6: GIT_DIR(rel), core.worktree=..(rel) in subdir' '
-	cat >6/sub/sub/expected <<EOF &&
-setup: git_dir: $here/6/.git
-setup: worktree: $here/6
-setup: cwd: $here/6
-setup: prefix: sub/sub/
-EOF
-	git config --file="$here/6/.git/config" core.worktree .. &&
-	test_repo 6/sub/sub ../../.git
-'
-
-test_expect_success '#6: GIT_DIR, core.worktree=.. in subdir' '
-	cat >6/sub/expected <<EOF &&
-setup: git_dir: $here/6/.git
-setup: worktree: $here/6
-setup: cwd: $here/6
-setup: prefix: sub/
-EOF
-	git config --file="$here/6/.git/config" core.worktree "$here/6" &&
-	test_repo 6/sub "$here/6/.git"
-'
-
-test_expect_success '#6: GIT_DIR, core.worktree=..(rel) in subdir' '
-	cat >6/sub/sub/expected <<EOF &&
-setup: git_dir: $here/6/.git
-setup: worktree: $here/6
-setup: cwd: $here/6
-setup: prefix: sub/sub/
-EOF
-	git config --file="$here/6/.git/config" core.worktree .. &&
-	test_repo 6/sub/sub "$here/6/.git"
-'
-
-test_expect_success '#6: GIT_DIR(rel), core.worktree=../wt at root' '
-	cat >6/expected <<EOF &&
-setup: git_dir: .git
-setup: worktree: $here/6/wt
-setup: cwd: $here/6
-setup: prefix: (null)
-EOF
-	git config --file="$here/6/.git/config" core.worktree "$here/6/wt" &&
-	test_repo 6 .git
-'
-
-test_expect_success '#6: GIT_DIR(rel), core.worktree=../wt(rel) at root' '
-	cat >6/expected <<EOF &&
-setup: git_dir: .git
-setup: worktree: $here/6/wt
-setup: cwd: $here/6
-setup: prefix: (null)
-EOF
-	git config --file="$here/6/.git/config" core.worktree ../wt &&
-	test_repo 6 .git
-'
-
-test_expect_success '#6: GIT_DIR, core.worktree=../wt(rel) at root' '
-	cat >6/expected <<EOF &&
-setup: git_dir: $here/6/.git
-setup: worktree: $here/6/wt
-setup: cwd: $here/6
-setup: prefix: (null)
-EOF
-	git config --file="$here/6/.git/config" core.worktree ../wt &&
-	test_repo 6 "$here/6/.git"
-'
-
-test_expect_success '#6: GIT_DIR, core.worktree=../wt at root' '
-	cat >6/expected <<EOF &&
-setup: git_dir: $here/6/.git
-setup: worktree: $here/6/wt
-setup: cwd: $here/6
-setup: prefix: (null)
-EOF
-	git config --file="$here/6/.git/config" core.worktree "$here/6/wt" &&
-	test_repo 6 "$here/6/.git"
-'
-
-test_expect_success '#6: GIT_DIR(rel), core.worktree=../wt in subdir' '
-	cat >6/sub/sub/expected <<EOF &&
-setup: git_dir: ../../.git
-setup: worktree: $here/6/wt
-setup: cwd: $here/6/sub/sub
-setup: prefix: (null)
-EOF
-	git config --file="$here/6/.git/config" core.worktree "$here/6/wt" &&
-	test_repo 6/sub/sub ../../.git
-'
-
-test_expect_success '#6: GIT_DIR(rel), core.worktree=../wt(rel) in subdir' '
-	cat >6/sub/sub/expected <<EOF &&
-setup: git_dir: ../../.git
-setup: worktree: $here/6/wt
-setup: cwd: $here/6/sub/sub
-setup: prefix: (null)
-EOF
-	git config --file="$here/6/.git/config" core.worktree ../wt &&
-	test_repo 6/sub/sub ../../.git
-'
-
-test_expect_success '#6: GIT_DIR, core.worktree=../wt(rel) in subdir' '
-	cat >6/sub/sub/expected <<EOF &&
-setup: git_dir: $here/6/.git
-setup: worktree: $here/6/wt
-setup: cwd: $here/6/sub/sub
-setup: prefix: (null)
-EOF
-	git config --file="$here/6/.git/config" core.worktree ../wt &&
-	test_repo 6/sub/sub "$here/6/.git"
-'
-
-test_expect_success '#6: GIT_DIR, core.worktree=../wt in subdir' '
-	cat >6/sub/sub/expected <<EOF &&
-setup: git_dir: $here/6/.git
-setup: worktree: $here/6/wt
-setup: cwd: $here/6/sub/sub
-setup: prefix: (null)
-EOF
-	git config --file="$here/6/.git/config" core.worktree "$here/6/wt" &&
-	test_repo 6/sub/sub "$here/6/.git"
-'
-
-test_expect_success '#6: GIT_DIR(rel), core.worktree=../.. at root' '
-	cat >6/expected <<EOF &&
-setup: git_dir: $here/6/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 6/
-EOF
-	git config --file="$here/6/.git/config" core.worktree "$here" &&
-	test_repo 6 .git
-'
-
-test_expect_success '#6: GIT_DIR(rel), core.worktree=../..(rel) at root' '
-	cat >6/expected <<EOF &&
-setup: git_dir: $here/6/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 6/
-EOF
-	git config --file="$here/6/.git/config" core.worktree ../../ &&
-	test_repo 6 .git
-'
-
-test_expect_success '#6: GIT_DIR, core.worktree=../..(rel) at root' '
-	cat >6/expected <<EOF &&
-setup: git_dir: $here/6/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 6/
-EOF
-	git config --file="$here/6/.git/config" core.worktree ../../ &&
-	test_repo 6 "$here/6/.git"
-'
-
-test_expect_success '#6: GIT_DIR, core.worktree=../.. at root' '
-	cat >6/expected <<EOF &&
-setup: git_dir: $here/6/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 6/
-EOF
-	git config --file="$here/6/.git/config" core.worktree "$here" &&
-	test_repo 6 "$here/6/.git"
-'
-
-test_expect_success '#6: GIT_DIR(rel), core.worktree=../.. in subdir' '
-	cat >6/sub/sub/expected <<EOF &&
-setup: git_dir: $here/6/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 6/sub/sub/
-EOF
-	git config --file="$here/6/.git/config" core.worktree "$here" &&
-	test_repo 6/sub/sub ../../.git
-'
-
-test_expect_success '#6: GIT_DIR(rel), core.worktree=../..(rel) in subdir' '
-	cat >6/sub/sub/expected <<EOF &&
-setup: git_dir: $here/6/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 6/sub/sub/
-EOF
-	git config --file="$here/6/.git/config" core.worktree ../.. &&
-	test_repo 6/sub/sub ../../.git
-'
-
-test_expect_success '#6: GIT_DIR, core.worktree=../..(rel) in subdir' '
-	cat >6/sub/sub/expected <<EOF &&
-setup: git_dir: $here/6/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 6/sub/sub/
-EOF
-	git config --file="$here/6/.git/config" core.worktree ../.. &&
-	test_repo 6/sub/sub "$here/6/.git"
-'
-
-test_expect_success '#6: GIT_DIR, core.worktree=../.. in subdir' '
-	cat >6/sub/sub/expected <<EOF &&
-setup: git_dir: $here/6/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 6/sub/sub/
-EOF
-	git config --file="$here/6/.git/config" core.worktree "$here" &&
-	test_repo 6/sub/sub "$here/6/.git"
-'
-
-#
-# case #7
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is set
-#  - GIT_DIR is set
-#  - core.worktree is set
-#  - .git is a directory
-#  - core.bare is not set, cwd is outside .git
-#
-# Output:
-#
-# core.worktree is overridden by GIT_WORK_TREE -> #3
-
+# case #7: GIT_WORK_TREE overrides core.worktree.
 test_expect_success '#7: setup' '
-	sane_unset GIT_DIR GIT_WORK_TREE &&
-	mkdir 7 7/sub 7/sub/sub 7.wt 7.wt/sub 7/wt 7/wt/sub &&
-	cd 7 &&
-	git init &&
-	git config core.worktree non-existent &&
-	cd ..
+	setup_repo 7 non-existent "" unset &&
+	mkdir -p 7/sub/sub 7/wt/sub
+'
+run_wt_tests 7
+
+test_expect_success '#8: gitfile, easy case' '
+	try_repo 8 unset unset unset gitfile unset \
+		"$here/8.git" "$here/8" "$here/8" "(null)" \
+		"$here/8.git" "$here/8" "$here/8" sub/
 '
 
-test_expect_success '#7: GIT_DIR(rel), GIT_WORK_TREE=root at root' '
-	cat >7/expected <<EOF &&
-setup: git_dir: .git
-setup: worktree: $here/7
-setup: cwd: $here/7
-setup: prefix: (null)
-EOF
-	test_repo 7 .git "$here/7"
+test_expect_success '#9: GIT_WORK_TREE accepted with gitfile' '
+	mkdir -p 9/wt &&
+	try_repo 9 wt unset unset gitfile unset \
+		"$here/9.git" "$here/9/wt" "$here/9" "(null)" \
+		"$here/9.git" "$here/9/sub/wt" "$here/9/sub" "(null)" 2>message &&
+	! test -s message
 '
 
-test_expect_success '#7: GIT_DIR(rel), GIT_WORK_TREE=root(rel) at root' '
-	cat >7/expected <<EOF &&
-setup: git_dir: .git
-setup: worktree: $here/7
-setup: cwd: $here/7
-setup: prefix: (null)
-EOF
-	test_repo 7 .git .
+test_expect_success '#10: GIT_DIR can point to gitfile' '
+	try_repo 10 unset "$here/10/.git" unset gitfile unset \
+		"$here/10.git" "$here/10" "$here/10" "(null)" \
+		"$here/10.git" "$here/10/sub" "$here/10/sub" "(null)"
 '
 
-test_expect_success '#7: GIT_DIR, GIT_WORK_TREE=root at root' '
-	cat >7/expected <<EOF &&
-setup: git_dir: $here/7/.git
-setup: worktree: $here/7
-setup: cwd: $here/7
-setup: prefix: (null)
-EOF
-	test_repo 7 "$here/7/.git" "$here/7"
+test_expect_success '#10b: relative GIT_DIR can point to gitfile' '
+	try_repo 10b unset .git unset gitfile unset \
+		"$here/10b.git" "$here/10b" "$here/10b" "(null)" \
+		"$here/10b.git" "$here/10b/sub" "$here/10b/sub" "(null)"
 '
 
-test_expect_success '#7: GIT_DIR, GIT_WORK_TREE=root(rel) at root' '
-	cat >7/expected <<EOF &&
-setup: git_dir: $here/7/.git
-setup: worktree: $here/7
-setup: cwd: $here/7
-setup: prefix: (null)
-EOF
-	test_repo 7 "$here/7/.git" .
-'
-
-test_expect_success '#7: GIT_DIR(rel), GIT_WORKTREE=root in subdir' '
-	cat >7/sub/sub/expected <<EOF &&
-setup: git_dir: $here/7/.git
-setup: worktree: $here/7
-setup: cwd: $here/7
-setup: prefix: sub/sub/
-EOF
-	test_repo 7/sub/sub ../../.git "$here/7"
-'
-
-test_expect_success '#7: GIT_DIR(rel), GIT_WORKTREE=root(rel) in subdir' '
-	cat >7/sub/sub/expected <<EOF &&
-setup: git_dir: $here/7/.git
-setup: worktree: $here/7
-setup: cwd: $here/7
-setup: prefix: sub/sub/
-EOF
-	test_repo 7/sub/sub ../../.git ../..
-'
-
-test_expect_success '#7: GIT_DIR, GIT_WORKTREE=root in subdir' '
-	cat >7/sub/expected <<EOF &&
-setup: git_dir: $here/7/.git
-setup: worktree: $here/7
-setup: cwd: $here/7
-setup: prefix: sub/
-EOF
-	test_repo 7/sub "$here/7/.git" "$here/7"
-'
-
-test_expect_success '#7: GIT_DIR, GIT_WORKTREE=root(rel) in subdir' '
-	cat >7/sub/sub/expected <<EOF &&
-setup: git_dir: $here/7/.git
-setup: worktree: $here/7
-setup: cwd: $here/7
-setup: prefix: sub/sub/
-EOF
-	test_repo 7/sub/sub "$here/7/.git" ../..
-'
-
-test_expect_success '#7: GIT_DIR(rel), GIT_WORK_TREE=wt at root' '
-	cat >7/expected <<EOF &&
-setup: git_dir: .git
-setup: worktree: $here/7/wt
-setup: cwd: $here/7
-setup: prefix: (null)
-EOF
-	test_repo 7 .git "$here/7/wt"
-'
-
-test_expect_success '#7: GIT_DIR(rel), GIT_WORK_TREE=wt(rel) at root' '
-	cat >7/expected <<EOF &&
-setup: git_dir: .git
-setup: worktree: $here/7/wt
-setup: cwd: $here/7
-setup: prefix: (null)
-EOF
-	test_repo 7 .git wt
-'
-
-test_expect_success '#7: GIT_DIR, GIT_WORK_TREE=wt(rel) at root' '
-	cat >7/expected <<EOF &&
-setup: git_dir: $here/7/.git
-setup: worktree: $here/7/wt
-setup: cwd: $here/7
-setup: prefix: (null)
-EOF
-	test_repo 7 "$here/7/.git" wt
-'
-
-test_expect_success '#7: GIT_DIR, GIT_WORK_TREE=wt at root' '
-	cat >7/expected <<EOF &&
-setup: git_dir: $here/7/.git
-setup: worktree: $here/7/wt
-setup: cwd: $here/7
-setup: prefix: (null)
-EOF
-	test_repo 7 "$here/7/.git" "$here/7/wt"
-'
-
-test_expect_success '#7: GIT_DIR(rel), GIT_WORK_TREE=wt in subdir' '
-	cat >7/sub/sub/expected <<EOF &&
-setup: git_dir: ../../.git
-setup: worktree: $here/7/wt
-setup: cwd: $here/7/sub/sub
-setup: prefix: (null)
-EOF
-	test_repo 7/sub/sub ../../.git "$here/7/wt"
-'
-
-test_expect_success '#7: GIT_DIR(rel), GIT_WORK_TREE=wt(rel) in subdir' '
-	cat >7/sub/sub/expected <<EOF &&
-setup: git_dir: ../../.git
-setup: worktree: $here/7/wt
-setup: cwd: $here/7/sub/sub
-setup: prefix: (null)
-EOF
-	test_repo 7/sub/sub ../../.git ../../wt
-'
-
-test_expect_success '#7: GIT_DIR, GIT_WORK_TREE=wt(rel) in subdir' '
-	cat >7/sub/sub/expected <<EOF &&
-setup: git_dir: $here/7/.git
-setup: worktree: $here/7/wt
-setup: cwd: $here/7/sub/sub
-setup: prefix: (null)
-EOF
-	test_repo 7/sub/sub "$here/7/.git" ../../wt
-'
-
-test_expect_success '#7: GIT_DIR, GIT_WORK_TREE=wt in subdir' '
-	cat >7/sub/sub/expected <<EOF &&
-setup: git_dir: $here/7/.git
-setup: worktree: $here/7/wt
-setup: cwd: $here/7/sub/sub
-setup: prefix: (null)
-EOF
-	test_repo 7/sub/sub "$here/7/.git" "$here/7/wt"
-'
-
-test_expect_success '#7: GIT_DIR(rel), GIT_WORK_TREE=.. at root' '
-	cat >7/expected <<EOF &&
-setup: git_dir: $here/7/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 7/
-EOF
-	test_repo 7 .git "$here"
-'
-
-test_expect_success '#7: GIT_DIR(rel), GIT_WORK_TREE=..(rel) at root' '
-	cat >7/expected <<EOF &&
-setup: git_dir: $here/7/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 7/
-EOF
-	test_repo 7 .git ..
-'
-
-test_expect_success '#7: GIT_DIR, GIT_WORK_TREE=..(rel) at root' '
-	cat >7/expected <<EOF &&
-setup: git_dir: $here/7/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 7/
-EOF
-	test_repo 7 "$here/7/.git" ..
-'
-
-test_expect_success '#7: GIT_DIR, GIT_WORK_TREE=.. at root' '
-	cat >7/expected <<EOF &&
-setup: git_dir: $here/7/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 7/
-EOF
-	test_repo 7 "$here/7/.git" "$here"
-'
-
-test_expect_success '#7: GIT_DIR(rel), GIT_WORK_TREE=.. in subdir' '
-	cat >7/sub/sub/expected <<EOF &&
-setup: git_dir: $here/7/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 7/sub/sub/
-EOF
-	test_repo 7/sub/sub ../../.git "$here"
-'
-
-test_expect_success '#7: GIT_DIR(rel), GIT_WORK_TREE=..(rel) in subdir' '
-	cat >7/sub/sub/expected <<EOF &&
-setup: git_dir: $here/7/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 7/sub/sub/
-EOF
-	test_repo 7/sub/sub ../../.git ../../..
-'
-
-test_expect_success '#7: GIT_DIR, GIT_WORK_TREE=..(rel) in subdir' '
-	cat >7/sub/sub/expected <<EOF &&
-setup: git_dir: $here/7/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 7/sub/sub/
-EOF
-	test_repo 7/sub/sub "$here/7/.git" ../../../
-'
-
-test_expect_success '#7: GIT_DIR, GIT_WORK_TREE=.. in subdir' '
-	cat >7/sub/sub/expected <<EOF &&
-setup: git_dir: $here/7/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 7/sub/sub/
-EOF
-	test_repo 7/sub/sub "$here/7/.git" "$here"
-'
-
-#
-# case #8
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is not set
-#  - GIT_DIR is not set
-#  - core.worktree is not set
-#  - .git is a file
-#  - core.bare is not set, cwd is outside .git
-#
-# Output:
-#
-# #0 except that git_dir is set by .git file
-
-test_expect_success '#8: setup' '
-	sane_unset GIT_DIR GIT_WORK_TREE &&
-	mkdir 8 8/sub &&
-	cd 8 &&
-	git init &&
-	mv .git ../8.git &&
-	echo gitdir: ../8.git >.git &&
-	cd ..
-'
-
-test_expect_success '#8: at root' '
-	cat >8/expected <<EOF &&
-setup: git_dir: $here/8.git
-setup: worktree: $here/8
-setup: cwd: $here/8
-setup: prefix: (null)
-EOF
-	test_repo 8
-'
-
-test_expect_success '#8: in subdir' '
-	cat >8/sub/expected <<EOF &&
-setup: git_dir: $here/8.git
-setup: worktree: $here/8
-setup: cwd: $here/8
-setup: prefix: sub/
-EOF
-	test_repo 8/sub
-'
-
-#
-# case #9
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is set
-#  - GIT_DIR is not set
-#  - core.worktree is not set
-#  - .git is a file
-#  - core.bare is not set, cwd is outside .git
-#
-# Output:
-#
-# #1 except that git_dir is set by .git file
-
-test_expect_success '#9: setup' '
-	sane_unset GIT_DIR GIT_WORK_TREE &&
-	mkdir 9 9/sub 9.wt 9.wt/sub 9/wt 9/wt/sub &&
-	cd 9 &&
-	git init &&
-	mv .git ../9.git &&
-	echo gitdir: ../9.git >.git &&
-	GIT_WORK_TREE=non-existent &&
-	export GIT_WORK_TREE &&
-	cd ..
-'
-
-test_expect_success '#9: at root' '
-	cat >9/expected <<EOF &&
-setup: git_dir: $here/9.git
-setup: worktree: $here/9
-setup: cwd: $here/9
-setup: prefix: (null)
-EOF
-	test_repo 9
-'
-
-test_expect_success '#9: in subdir' '
-	cat >9/sub/expected <<EOF &&
-setup: git_dir: $here/9.git
-setup: worktree: $here/9
-setup: cwd: $here/9
-setup: prefix: sub/
-EOF
-	test_repo 9/sub
-'
-
-#
-# case #10
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is not set
-#  - GIT_DIR is set
-#  - core.worktree is not set
-#  - .git is a file
-#  - core.bare is not set, cwd is outside .git
-#
-# Output:
-#
-# #2 except that git_dir is set by .git file
-
-test_expect_success '#10: setup' '
-	sane_unset GIT_DIR GIT_WORK_TREE &&
-	mkdir 10 10/sub &&
-	cd 10 &&
-	git init &&
-	mv .git ../10.git &&
-	echo gitdir: ../10.git >.git &&
-	cd ..
-'
-
-test_expect_success '#10: at root' '
-	cat >10/expected <<EOF &&
-setup: git_dir: $here/10.git
-setup: worktree: $here/10
-setup: cwd: $here/10
-setup: prefix: (null)
-EOF
-	test_repo 10 "$here/10/.git"
-'
-
-test_expect_success '#10: in subdir' '
-	cat >10/sub/expected <<EOF &&
-setup: git_dir: $here/10.git
-setup: worktree: $here/10/sub
-setup: cwd: $here/10/sub
-setup: prefix: (null)
-EOF
-	test_repo 10/sub "$here/10/.git"
-'
-
-test_expect_success '#10: relative GIT_DIR at root' '
-	cat >10/expected <<EOF &&
-setup: git_dir: $here/10.git
-setup: worktree: $here/10
-setup: cwd: $here/10
-setup: prefix: (null)
-EOF
-	test_repo 10 .git
-'
-
-test_expect_success '#10: relative GIT_DIR in subdir' '
-	cat >10/sub/expected <<EOF &&
-setup: git_dir: $here/10.git
-setup: worktree: $here/10/sub
-setup: cwd: $here/10/sub
-setup: prefix: (null)
-EOF
-	test_repo 10/sub ../.git
-'
-
-#
-# case #11
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is set
-#  - GIT_DIR is set
-#  - core.worktree is not set
-#  - .git is a file
-#  - core.bare is not set, cwd is outside .git
-#
-# Output:
-#
-# #3 except that git_dir is set by .git file
-
+# case #11: GIT_WORK_TREE works, gitfile case.
 test_expect_success '#11: setup' '
-	sane_unset GIT_DIR GIT_WORK_TREE &&
-	mkdir 11 11/sub 11/sub/sub 11.wt 11.wt/sub 11/wt 11/wt/sub &&
-	cd 11 &&
-	git init &&
-	mv .git ../11.git &&
-	echo gitdir: ../11.git >.git &&
-	cd ..
+	setup_repo 11 unset gitfile unset &&
+	mkdir -p 11/sub/sub 11/wt/sub
+'
+run_wt_tests 11 gitfile
+
+test_expect_success '#12: core.worktree with gitfile is accepted' '
+	try_repo 12 unset unset "$here/12" gitfile unset \
+		"$here/12.git" "$here/12" "$here/12" "(null)" \
+		"$here/12.git" "$here/12" "$here/12" sub/ 2>message &&
+	! test -s message
 '
 
-test_expect_success '#11: GIT_DIR(rel), GIT_WORK_TREE=root at root' '
-	cat >11/expected <<EOF &&
-setup: git_dir: $here/11.git
-setup: worktree: $here/11
-setup: cwd: $here/11
-setup: prefix: (null)
-EOF
-	test_repo 11 .git "$here/11"
+test_expect_success '#13: core.worktree+GIT_WORK_TREE accepted (with gitfile)' '
+	# or: you cannot intimidate away the lack of GIT_DIR setting
+	try_repo 13 non-existent-too unset non-existent gitfile unset \
+		"$here/13.git" "$here/13/non-existent-too" "$here/13" "(null)" \
+		"$here/13.git" "$here/13/sub/non-existent-too" "$here/13/sub" "(null)" 2>message &&
+	! test -s message
 '
 
-test_expect_success '#11: GIT_DIR(rel), GIT_WORK_TREE=root(rel) at root' '
-	cat >11/expected <<EOF &&
-setup: git_dir: $here/11.git
-setup: worktree: $here/11
-setup: cwd: $here/11
-setup: prefix: (null)
-EOF
-	test_repo 11 .git .
+# case #14.
+# If this were more table-driven, it could share code with case #6.
+
+test_expect_success '#14: core.worktree with GIT_DIR pointing to gitfile' '
+	setup_repo 14 "$here/14" gitfile unset &&
+	try_case 14 unset .git \
+		"$here/14.git" "$here/14" "$here/14" "(null)" &&
+	try_case 14 unset "$here/14/.git" \
+		"$here/14.git" "$here/14" "$here/14" "(null)" &&
+	try_case 14/sub/sub unset ../../.git \
+		"$here/14.git" "$here/14" "$here/14" sub/sub/ &&
+	try_case 14/sub/sub unset "$here/14/.git" \
+		"$here/14.git" "$here/14" "$here/14" sub/sub/ &&
+
+	setup_repo 14c "$here/14c/wt" gitfile unset &&
+	mkdir -p 14c/wt/sub &&
+
+	try_case 14c unset .git \
+		"$here/14c.git" "$here/14c/wt" "$here/14c" "(null)" &&
+	try_case 14c unset "$here/14c/.git" \
+		"$here/14c.git" "$here/14c/wt" "$here/14c" "(null)" &&
+	try_case 14c/sub/sub unset ../../.git \
+		"$here/14c.git" "$here/14c/wt" "$here/14c/sub/sub" "(null)" &&
+	try_case 14c/sub/sub unset "$here/14c/.git" \
+		"$here/14c.git" "$here/14c/wt" "$here/14c/sub/sub" "(null)" &&
+
+	setup_repo 14d "$here/14d/wt" gitfile unset &&
+	mkdir -p 14d/wt/sub &&
+
+	try_case 14d unset .git \
+		"$here/14d.git" "$here/14d/wt" "$here/14d" "(null)" &&
+	try_case 14d unset "$here/14d/.git" \
+		"$here/14d.git" "$here/14d/wt" "$here/14d" "(null)" &&
+	try_case 14d/sub/sub unset ../../.git \
+		"$here/14d.git" "$here/14d/wt" "$here/14d/sub/sub" "(null)" &&
+	try_case 14d/sub/sub unset "$here/14d/.git" \
+		"$here/14d.git" "$here/14d/wt" "$here/14d/sub/sub" "(null)" &&
+
+	setup_repo 14e "$here" gitfile unset &&
+	try_case 14e unset .git \
+		"$here/14e.git" "$here" "$here" 14e/ &&
+	try_case 14e unset "$here/14e/.git" \
+		"$here/14e.git" "$here" "$here" 14e/ &&
+	try_case 14e/sub/sub unset ../../.git \
+		"$here/14e.git" "$here" "$here" 14e/sub/sub/ &&
+	try_case 14e/sub/sub unset "$here/14e/.git" \
+		"$here/14e.git" "$here" "$here" 14e/sub/sub/
 '
 
-test_expect_success '#11: GIT_DIR, GIT_WORK_TREE=root at root' '
-	cat >11/expected <<EOF &&
-setup: git_dir: $here/11.git
-setup: worktree: $here/11
-setup: cwd: $here/11
-setup: prefix: (null)
-EOF
-	test_repo 11 "$here/11/.git" "$here/11"
+test_expect_success '#14b: core.worktree is relative to actual git dir' '
+	setup_repo 14b ../14b gitfile unset &&
+	try_case 14b unset .git \
+		"$here/14b.git" "$here/14b" "$here/14b" "(null)" &&
+	try_case 14b unset "$here/14b/.git" \
+		"$here/14b.git" "$here/14b" "$here/14b" "(null)" &&
+	try_case 14b/sub/sub unset ../../.git \
+		"$here/14b.git" "$here/14b" "$here/14b" sub/sub/ &&
+	try_case 14b/sub/sub unset "$here/14b/.git" \
+		"$here/14b.git" "$here/14b" "$here/14b" sub/sub/ &&
+
+	setup_repo 14f ../ gitfile unset &&
+	try_case 14f unset .git \
+		"$here/14f.git" "$here" "$here" 14f/ &&
+	try_case 14f unset "$here/14f/.git" \
+		"$here/14f.git" "$here" "$here" 14f/ &&
+	try_case 14f/sub/sub unset ../../.git \
+		"$here/14f.git" "$here" "$here" 14f/sub/sub/ &&
+	try_case 14f/sub/sub unset "$here/14f/.git" \
+		"$here/14f.git" "$here" "$here" 14f/sub/sub/
 '
 
-test_expect_success '#11: GIT_DIR, GIT_WORK_TREE=root(rel) at root' '
-	cat >11/expected <<EOF &&
-setup: git_dir: $here/11.git
-setup: worktree: $here/11
-setup: cwd: $here/11
-setup: prefix: (null)
-EOF
-	test_repo 11 "$here/11/.git" .
-'
-
-test_expect_success '#11: GIT_DIR(rel), GIT_WORKTREE=root in subdir' '
-	cat >11/sub/sub/expected <<EOF &&
-setup: git_dir: $here/11.git
-setup: worktree: $here/11
-setup: cwd: $here/11
-setup: prefix: sub/sub/
-EOF
-	test_repo 11/sub/sub ../../.git "$here/11"
-'
-
-test_expect_success '#11: GIT_DIR(rel), GIT_WORKTREE=root(rel) in subdir' '
-	cat >11/sub/sub/expected <<EOF &&
-setup: git_dir: $here/11.git
-setup: worktree: $here/11
-setup: cwd: $here/11
-setup: prefix: sub/sub/
-EOF
-	test_repo 11/sub/sub ../../.git ../..
-'
-
-test_expect_success '#11: GIT_DIR, GIT_WORKTREE=root in subdir' '
-	cat >11/sub/expected <<EOF &&
-setup: git_dir: $here/11.git
-setup: worktree: $here/11
-setup: cwd: $here/11
-setup: prefix: sub/
-EOF
-	test_repo 11/sub "$here/11/.git" "$here/11"
-'
-
-test_expect_success '#11: GIT_DIR, GIT_WORKTREE=root(rel) in subdir' '
-	cat >11/sub/sub/expected <<EOF &&
-setup: git_dir: $here/11.git
-setup: worktree: $here/11
-setup: cwd: $here/11
-setup: prefix: sub/sub/
-EOF
-	test_repo 11/sub/sub "$here/11/.git" ../..
-'
-
-test_expect_success '#11: GIT_DIR(rel), GIT_WORK_TREE=wt at root' '
-	cat >11/expected <<EOF &&
-setup: git_dir: $here/11.git
-setup: worktree: $here/11/wt
-setup: cwd: $here/11
-setup: prefix: (null)
-EOF
-	test_repo 11 .git "$here/11/wt"
-'
-
-test_expect_success '#11: GIT_DIR(rel), GIT_WORK_TREE=wt(rel) at root' '
-	cat >11/expected <<EOF &&
-setup: git_dir: $here/11.git
-setup: worktree: $here/11/wt
-setup: cwd: $here/11
-setup: prefix: (null)
-EOF
-	test_repo 11 .git wt
-'
-
-test_expect_success '#11: GIT_DIR, GIT_WORK_TREE=wt(rel) at root' '
-	cat >11/expected <<EOF &&
-setup: git_dir: $here/11.git
-setup: worktree: $here/11/wt
-setup: cwd: $here/11
-setup: prefix: (null)
-EOF
-	test_repo 11 "$here/11/.git" wt
-'
-
-test_expect_success '#11: GIT_DIR, GIT_WORK_TREE=wt at root' '
-	cat >11/expected <<EOF &&
-setup: git_dir: $here/11.git
-setup: worktree: $here/11/wt
-setup: cwd: $here/11
-setup: prefix: (null)
-EOF
-	test_repo 11 "$here/11/.git" "$here/11/wt"
-'
-
-test_expect_success '#11: GIT_DIR(rel), GIT_WORK_TREE=wt in subdir' '
-	cat >11/sub/sub/expected <<EOF &&
-setup: git_dir: $here/11.git
-setup: worktree: $here/11/wt
-setup: cwd: $here/11/sub/sub
-setup: prefix: (null)
-EOF
-	test_repo 11/sub/sub ../../.git "$here/11/wt"
-'
-
-test_expect_success '#11: GIT_DIR(rel), GIT_WORK_TREE=wt(rel) in subdir' '
-	cat >11/sub/sub/expected <<EOF &&
-setup: git_dir: $here/11.git
-setup: worktree: $here/11/wt
-setup: cwd: $here/11/sub/sub
-setup: prefix: (null)
-EOF
-	test_repo 11/sub/sub ../../.git ../../wt
-'
-
-test_expect_success '#11: GIT_DIR, GIT_WORK_TREE=wt(rel) in subdir' '
-	cat >11/sub/sub/expected <<EOF &&
-setup: git_dir: $here/11.git
-setup: worktree: $here/11/wt
-setup: cwd: $here/11/sub/sub
-setup: prefix: (null)
-EOF
-	test_repo 11/sub/sub "$here/11/.git" ../../wt
-'
-
-test_expect_success '#11: GIT_DIR, GIT_WORK_TREE=wt in subdir' '
-	cat >11/sub/sub/expected <<EOF &&
-setup: git_dir: $here/11.git
-setup: worktree: $here/11/wt
-setup: cwd: $here/11/sub/sub
-setup: prefix: (null)
-EOF
-	test_repo 11/sub/sub "$here/11/.git" "$here/11/wt"
-'
-
-test_expect_success '#11: GIT_DIR(rel), GIT_WORK_TREE=.. at root' '
-	cat >11/expected <<EOF &&
-setup: git_dir: $here/11.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 11/
-EOF
-	test_repo 11 .git "$here"
-'
-
-test_expect_success '#11: GIT_DIR(rel), GIT_WORK_TREE=..(rel) at root' '
-	cat >11/expected <<EOF &&
-setup: git_dir: $here/11.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 11/
-EOF
-	test_repo 11 .git ..
-'
-
-test_expect_success '#11: GIT_DIR, GIT_WORK_TREE=..(rel) at root' '
-	cat >11/expected <<EOF &&
-setup: git_dir: $here/11.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 11/
-EOF
-	test_repo 11 "$here/11/.git" ..
-'
-
-test_expect_success '#11: GIT_DIR, GIT_WORK_TREE=.. at root' '
-	cat >11/expected <<EOF &&
-setup: git_dir: $here/11.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 11/
-EOF
-	test_repo 11 "$here/11/.git" "$here"
-'
-
-test_expect_success '#11: GIT_DIR(rel), GIT_WORK_TREE=.. in subdir' '
-	cat >11/sub/sub/expected <<EOF &&
-setup: git_dir: $here/11.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 11/sub/sub/
-EOF
-	test_repo 11/sub/sub ../../.git "$here"
-'
-
-test_expect_success '#11: GIT_DIR(rel), GIT_WORK_TREE=..(rel) in subdir' '
-	cat >11/sub/sub/expected <<EOF &&
-setup: git_dir: $here/11.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 11/sub/sub/
-EOF
-	test_repo 11/sub/sub ../../.git ../../..
-'
-
-test_expect_success '#11: GIT_DIR, GIT_WORK_TREE=..(rel) in subdir' '
-	cat >11/sub/sub/expected <<EOF &&
-setup: git_dir: $here/11.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 11/sub/sub/
-EOF
-	test_repo 11/sub/sub "$here/11/.git" ../../../
-'
-
-test_expect_success '#11: GIT_DIR, GIT_WORK_TREE=.. in subdir' '
-	cat >11/sub/sub/expected <<EOF &&
-setup: git_dir: $here/11.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 11/sub/sub/
-EOF
-	test_repo 11/sub/sub "$here/11/.git" "$here"
-'
-
-#
-# case #12
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is not set
-#  - GIT_DIR is not set
-#  - core.worktree is set
-#  - .git is a file
-#  - core.bare is not set, cwd is outside .git
-#
-# Output:
-#
-# #4 except that git_dir is set by .git file
-
-
-test_expect_success '#12: setup' '
-	sane_unset GIT_DIR GIT_WORK_TREE &&
-	mkdir 12 12/sub 12/sub/sub 12.wt 12.wt/sub 12/wt 12/wt/sub &&
-	cd 12 &&
-	git init &&
-	git config core.worktree non-existent &&
-	mv .git ../12.git &&
-	echo gitdir: ../12.git >.git &&
-	cd ..
-'
-
-test_expect_success '#12: at root' '
-	cat >12/expected <<EOF &&
-setup: git_dir: $here/12.git
-setup: worktree: $here/12
-setup: cwd: $here/12
-setup: prefix: (null)
-EOF
-	test_repo 12
-'
-
-test_expect_success '#12: in subdir' '
-	cat >12/sub/expected <<EOF &&
-setup: git_dir: $here/12.git
-setup: worktree: $here/12
-setup: cwd: $here/12
-setup: prefix: sub/
-EOF
-	test_repo 12/sub
-'
-
-#
-# case #13
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is set
-#  - GIT_DIR is not set
-#  - core.worktree is set
-#  - .git is a file
-#  - core.bare is not set, cwd is outside .git
-#
-# Output:
-#
-# #5 except that git_dir is set by .git file
-
-test_expect_success '#13: setup' '
-	sane_unset GIT_DIR GIT_WORK_TREE &&
-	mkdir 13 13/sub 13/sub/sub 13.wt 13.wt/sub 13/wt 13/wt/sub &&
-	cd 13 &&
-	git init &&
-	git config core.worktree non-existent &&
-	GIT_WORK_TREE=non-existent-too &&
-	export GIT_WORK_TREE &&
-	mv .git ../13.git &&
-	echo gitdir: ../13.git >.git &&
-	cd ..
-'
-
-test_expect_success '#13: at root' '
-	cat >13/expected <<EOF &&
-setup: git_dir: $here/13.git
-setup: worktree: $here/13
-setup: cwd: $here/13
-setup: prefix: (null)
-EOF
-	test_repo 13
-'
-
-test_expect_success '#13: in subdir' '
-	cat >13/sub/expected <<EOF &&
-setup: git_dir: $here/13.git
-setup: worktree: $here/13
-setup: cwd: $here/13
-setup: prefix: sub/
-EOF
-	test_repo 13/sub
-'
-
-#
-# case #14
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is not set
-#  - GIT_DIR is set
-#  - core.worktree is set
-#  - .git is a file
-#  - core.bare is not set, cwd is outside .git
-#
-# Output:
-#
-# #6 except that git_dir is set by .git file
-
-test_expect_success '#14: setup' '
-	sane_unset GIT_DIR GIT_WORK_TREE &&
-	mkdir 14 14/sub 14/sub/sub 14.wt 14.wt/sub 14/wt 14/wt/sub &&
-	cd 14 &&
-	git init &&
-	mv .git ../14.git &&
-	echo gitdir: ../14.git >.git &&
-	cd ..
-'
-
-test_expect_success '#14: GIT_DIR(rel), core.worktree=../14 at root' '
-	cat >14/expected <<EOF &&
-setup: git_dir: $here/14.git
-setup: worktree: $here/14
-setup: cwd: $here/14
-setup: prefix: (null)
-EOF
-	git config --file="$here/14.git/config" core.worktree "$here/14" &&
-	test_repo 14 .git
-'
-
-test_expect_success '#14: GIT_DIR(rel), core.worktree=../14(rel) at root' '
-	cat >14/expected <<EOF &&
-setup: git_dir: $here/14.git
-setup: worktree: $here/14
-setup: cwd: $here/14
-setup: prefix: (null)
-EOF
-	git config --file="$here/14.git/config" core.worktree ../14 &&
-	test_repo 14 .git
-'
-
-test_expect_success '#14: GIT_DIR, core.worktree=../14 at root' '
-	cat >14/expected <<EOF &&
-setup: git_dir: $here/14.git
-setup: worktree: $here/14
-setup: cwd: $here/14
-setup: prefix: (null)
-EOF
-	git config --file="$here/14.git/config" core.worktree "$here/14" &&
-	test_repo 14 "$here/14/.git"
-'
-
-test_expect_success '#14: GIT_DIR, core.worktree=../14(rel) at root' '
-	cat >14/expected <<EOF &&
-setup: git_dir: $here/14.git
-setup: worktree: $here/14
-setup: cwd: $here/14
-setup: prefix: (null)
-EOF
-	git config --file="$here/14.git/config" core.worktree ../14 &&
-	test_repo 14 "$here/14/.git"
-'
-
-test_expect_success '#14: GIT_DIR(rel), core.worktree=../14 in subdir' '
-	cat >14/sub/sub/expected <<EOF &&
-setup: git_dir: $here/14.git
-setup: worktree: $here/14
-setup: cwd: $here/14
-setup: prefix: sub/sub/
-EOF
-	git config --file="$here/14.git/config" core.worktree "$here/14" &&
-	test_repo 14/sub/sub ../../.git
-'
-
-test_expect_success '#14: GIT_DIR(rel), core.worktree=../14(rel) in subdir' '
-	cat >14/sub/sub/expected <<EOF &&
-setup: git_dir: $here/14.git
-setup: worktree: $here/14
-setup: cwd: $here/14
-setup: prefix: sub/sub/
-EOF
-	git config --file="$here/14.git/config" core.worktree ../14 &&
-	test_repo 14/sub/sub ../../.git
-'
-
-test_expect_success '#14: GIT_DIR, core.worktree=../14 in subdir' '
-	cat >14/sub/expected <<EOF &&
-setup: git_dir: $here/14.git
-setup: worktree: $here/14
-setup: cwd: $here/14
-setup: prefix: sub/
-EOF
-	git config --file="$here/14.git/config" core.worktree "$here/14" &&
-	test_repo 14/sub "$here/14/.git"
-'
-
-test_expect_success '#14: GIT_DIR, core.worktree=../14(rel) in subdir' '
-	cat >14/sub/sub/expected <<EOF &&
-setup: git_dir: $here/14.git
-setup: worktree: $here/14
-setup: cwd: $here/14
-setup: prefix: sub/sub/
-EOF
-	git config --file="$here/14.git/config" core.worktree ../14 &&
-	test_repo 14/sub/sub "$here/14/.git"
-'
-
-test_expect_success '#14: GIT_DIR(rel), core.worktree=../14/wt at root' '
-	cat >14/expected <<EOF &&
-setup: git_dir: $here/14.git
-setup: worktree: $here/14/wt
-setup: cwd: $here/14
-setup: prefix: (null)
-EOF
-	git config --file="$here/14.git/config" core.worktree "$here/14/wt" &&
-	test_repo 14 .git
-'
-
-test_expect_success '#14: GIT_DIR(rel), core.worktree=../14/wt(rel) at root' '
-	cat >14/expected <<EOF &&
-setup: git_dir: $here/14.git
-setup: worktree: $here/14/wt
-setup: cwd: $here/14
-setup: prefix: (null)
-EOF
-	git config --file="$here/14.git/config" core.worktree ../14/wt &&
-	test_repo 14 .git
-'
-
-test_expect_success '#14: GIT_DIR, core.worktree=../14/wt(rel) at root' '
-	cat >14/expected <<EOF &&
-setup: git_dir: $here/14.git
-setup: worktree: $here/14/wt
-setup: cwd: $here/14
-setup: prefix: (null)
-EOF
-	git config --file="$here/14.git/config" core.worktree ../14/wt &&
-	test_repo 14 "$here/14/.git"
-'
-
-test_expect_success '#14: GIT_DIR, core.worktree=../14/wt at root' '
-	cat >14/expected <<EOF &&
-setup: git_dir: $here/14.git
-setup: worktree: $here/14/wt
-setup: cwd: $here/14
-setup: prefix: (null)
-EOF
-	git config --file="$here/14.git/config" core.worktree "$here/14/wt" &&
-	test_repo 14 "$here/14/.git"
-'
-
-test_expect_success '#14: GIT_DIR(rel), core.worktree=../14/wt in subdir' '
-	cat >14/sub/sub/expected <<EOF &&
-setup: git_dir: $here/14.git
-setup: worktree: $here/14/wt
-setup: cwd: $here/14/sub/sub
-setup: prefix: (null)
-EOF
-	git config --file="$here/14.git/config" core.worktree "$here/14/wt" &&
-	test_repo 14/sub/sub ../../.git
-'
-
-test_expect_success '#14: GIT_DIR(rel), core.worktree=../14/wt(rel) in subdir' '
-	cat >14/sub/sub/expected <<EOF &&
-setup: git_dir: $here/14.git
-setup: worktree: $here/14/wt
-setup: cwd: $here/14/sub/sub
-setup: prefix: (null)
-EOF
-	git config --file="$here/14.git/config" core.worktree ../14/wt &&
-	test_repo 14/sub/sub ../../.git
-'
-
-test_expect_success '#14: GIT_DIR, core.worktree=../14/wt(rel) in subdir' '
-	cat >14/sub/sub/expected <<EOF &&
-setup: git_dir: $here/14.git
-setup: worktree: $here/14/wt
-setup: cwd: $here/14/sub/sub
-setup: prefix: (null)
-EOF
-	git config --file="$here/14.git/config" core.worktree ../14/wt &&
-	test_repo 14/sub/sub "$here/14/.git"
-'
-
-test_expect_success '#14: GIT_DIR, core.worktree=../14/wt in subdir' '
-	cat >14/sub/sub/expected <<EOF &&
-setup: git_dir: $here/14.git
-setup: worktree: $here/14/wt
-setup: cwd: $here/14/sub/sub
-setup: prefix: (null)
-EOF
-	git config --file="$here/14.git/config" core.worktree "$here/14/wt" &&
-	test_repo 14/sub/sub "$here/14/.git"
-'
-
-test_expect_success '#14: GIT_DIR(rel), core.worktree=.. at root' '
-	cat >14/expected <<EOF &&
-setup: git_dir: $here/14.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 14/
-EOF
-	git config --file="$here/14.git/config" core.worktree "$here" &&
-	test_repo 14 .git
-'
-
-test_expect_success '#14: GIT_DIR(rel), core.worktree=..(rel) at root' '
-	cat >14/expected <<EOF &&
-setup: git_dir: $here/14.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 14/
-EOF
-	git config --file="$here/14.git/config" core.worktree .. &&
-	test_repo 14 .git
-'
-
-test_expect_success '#14: GIT_DIR, core.worktree=..(rel) at root' '
-	cat >14/expected <<EOF &&
-setup: git_dir: $here/14.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 14/
-EOF
-	git config --file="$here/14.git/config" core.worktree .. &&
-	test_repo 14 "$here/14/.git"
-'
-
-test_expect_success '#14: GIT_DIR, core.worktree=.. at root' '
-	cat >14/expected <<EOF &&
-setup: git_dir: $here/14.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 14/
-EOF
-	git config --file="$here/14.git/config" core.worktree "$here" &&
-	test_repo 14 "$here/14/.git"
-'
-
-test_expect_success '#14: GIT_DIR(rel), core.worktree=.. in subdir' '
-	cat >14/sub/sub/expected <<EOF &&
-setup: git_dir: $here/14.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 14/sub/sub/
-EOF
-	git config --file="$here/14.git/config" core.worktree "$here" &&
-	test_repo 14/sub/sub ../../.git
-'
-
-test_expect_success '#14: GIT_DIR(rel), core.worktree=..(rel) in subdir' '
-	cat >14/sub/sub/expected <<EOF &&
-setup: git_dir: $here/14.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 14/sub/sub/
-EOF
-	git config --file="$here/14.git/config" core.worktree .. &&
-	test_repo 14/sub/sub ../../.git
-'
-
-test_expect_success '#14: GIT_DIR, core.worktree=..(rel) in subdir' '
-	cat >14/sub/sub/expected <<EOF &&
-setup: git_dir: $here/14.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 14/sub/sub/
-EOF
-	git config --file="$here/14.git/config" core.worktree .. &&
-	test_repo 14/sub/sub "$here/14/.git"
-'
-
-test_expect_success '#14: GIT_DIR, core.worktree=.. in subdir' '
-	cat >14/sub/sub/expected <<EOF &&
-setup: git_dir: $here/14.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 14/sub/sub/
-EOF
-	git config --file="$here/14.git/config" core.worktree "$here" &&
-	test_repo 14/sub/sub "$here/14/.git"
-'
-
-#
-# case #15
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is set
-#  - GIT_DIR is set
-#  - core.worktree is set
-#  - .git is a file
-#  - core.bare is not set, cwd is outside .git
-#
-# Output:
-#
-# #7 except that git_dir is set by .git file
-
+# case #15: GIT_WORK_TREE overrides core.worktree (gitfile case).
 test_expect_success '#15: setup' '
-	sane_unset GIT_DIR GIT_WORK_TREE &&
-	mkdir 15 15/sub 15/sub/sub 15.wt 15.wt/sub 15/wt 15/wt/sub &&
-	cd 15 &&
-	git init &&
-	git config core.worktree non-existent &&
-	mv .git ../15.git &&
-	echo gitdir: ../15.git >.git &&
-	cd ..
+	setup_repo 15 non-existent gitfile unset &&
+	mkdir -p 15/sub/sub 15/wt/sub
+'
+run_wt_tests 15 gitfile
+
+test_expect_success '#16a: implicitly bare repo (cwd inside .git dir)' '
+	setup_repo 16a unset "" unset &&
+	mkdir -p 16a/.git/wt/sub &&
+
+	try_case 16a/.git unset unset \
+		. "(null)" "$here/16a/.git" "(null)" &&
+	try_case 16a/.git/wt unset unset \
+		"$here/16a/.git" "(null)" "$here/16a/.git/wt" "(null)" &&
+	try_case 16a/.git/wt/sub unset unset \
+		"$here/16a/.git" "(null)" "$here/16a/.git/wt/sub" "(null)"
 '
 
-test_expect_success '#15: GIT_DIR(rel), GIT_WORK_TREE=root at root' '
-	cat >15/expected <<EOF &&
-setup: git_dir: $here/15.git
-setup: worktree: $here/15
-setup: cwd: $here/15
-setup: prefix: (null)
-EOF
-	test_repo 15 .git "$here/15"
+test_expect_success '#16b: bare .git (cwd inside .git dir)' '
+	setup_repo 16b unset "" true &&
+	mkdir -p 16b/.git/wt/sub &&
+
+	try_case 16b/.git unset unset \
+		. "(null)" "$here/16b/.git" "(null)" &&
+	try_case 16b/.git/wt unset unset \
+		"$here/16b/.git" "(null)" "$here/16b/.git/wt" "(null)" &&
+	try_case 16b/.git/wt/sub unset unset \
+		"$here/16b/.git" "(null)" "$here/16b/.git/wt/sub" "(null)"
 '
 
-test_expect_success '#15: GIT_DIR(rel), GIT_WORK_TREE=root(rel) at root' '
-	cat >15/expected <<EOF &&
-setup: git_dir: $here/15.git
-setup: worktree: $here/15
-setup: cwd: $here/15
-setup: prefix: (null)
-EOF
-	test_repo 15 .git .
+test_expect_success '#16c: bare .git has no worktree' '
+	try_repo 16c unset unset unset "" true \
+		.git "(null)" "$here/16c" "(null)" \
+		"$here/16c/.git" "(null)" "$here/16c/sub" "(null)"
 '
 
-test_expect_success '#15: GIT_DIR, GIT_WORK_TREE=root at root' '
-	cat >15/expected <<EOF &&
-setup: git_dir: $here/15.git
-setup: worktree: $here/15
-setup: cwd: $here/15
-setup: prefix: (null)
-EOF
-	test_repo 15 "$here/15/.git" "$here/15"
+test_expect_success '#17: GIT_WORK_TREE without explicit GIT_DIR is accepted (bare case)' '
+	# Just like #16.
+	setup_repo 17a unset "" true &&
+	setup_repo 17b unset "" true &&
+	mkdir -p 17a/.git/wt/sub &&
+	mkdir -p 17b/.git/wt/sub &&
+
+	try_case 17a/.git "$here/17a" unset \
+		"$here/17a/.git" "$here/17a" "$here/17a" .git/ \
+		2>message &&
+	try_case 17a/.git/wt "$here/17a" unset \
+		"$here/17a/.git" "$here/17a" "$here/17a" .git/wt/ &&
+	try_case 17a/.git/wt/sub "$here/17a" unset \
+		"$here/17a/.git" "$here/17a" "$here/17a" .git/wt/sub/ &&
+
+	try_case 17b/.git "$here/17b" unset \
+		"$here/17b/.git" "$here/17b" "$here/17b" .git/ &&
+	try_case 17b/.git/wt "$here/17b" unset \
+		"$here/17b/.git" "$here/17b" "$here/17b" .git/wt/ &&
+	try_case 17b/.git/wt/sub "$here/17b" unset \
+		"$here/17b/.git" "$here/17b" "$here/17b" .git/wt/sub/ &&
+
+	try_repo 17c "$here/17c" unset unset "" true \
+		.git "$here/17c" "$here/17c" "(null)" \
+		"$here/17c/.git" "$here/17c" "$here/17c" sub/ 2>message &&
+	! test -s message
 '
 
-test_expect_success '#15: GIT_DIR, GIT_WORK_TREE=root(rel) at root' '
-	cat >15/expected <<EOF &&
-setup: git_dir: $here/15.git
-setup: worktree: $here/15
-setup: cwd: $here/15
-setup: prefix: (null)
-EOF
-	test_repo 15 "$here/15/.git" .
+test_expect_success '#18: bare .git named by GIT_DIR has no worktree' '
+	try_repo 18 unset .git unset "" true \
+		.git "(null)" "$here/18" "(null)" \
+		../.git "(null)" "$here/18/sub" "(null)" &&
+	try_repo 18b unset "$here/18b/.git" unset "" true \
+		"$here/18b/.git" "(null)" "$here/18b" "(null)" \
+		"$here/18b/.git" "(null)" "$here/18b/sub" "(null)"
 '
 
-test_expect_success '#15: GIT_DIR(rel), GIT_WORKTREE=root in subdir' '
-	cat >15/sub/sub/expected <<EOF &&
-setup: git_dir: $here/15.git
-setup: worktree: $here/15
-setup: cwd: $here/15
-setup: prefix: sub/sub/
-EOF
-	test_repo 15/sub/sub ../../.git "$here/15"
-'
-
-test_expect_success '#15: GIT_DIR(rel), GIT_WORKTREE=root(rel) in subdir' '
-	cat >15/sub/sub/expected <<EOF &&
-setup: git_dir: $here/15.git
-setup: worktree: $here/15
-setup: cwd: $here/15
-setup: prefix: sub/sub/
-EOF
-	test_repo 15/sub/sub ../../.git ../..
-'
-
-test_expect_success '#15: GIT_DIR, GIT_WORKTREE=root in subdir' '
-	cat >15/sub/expected <<EOF &&
-setup: git_dir: $here/15.git
-setup: worktree: $here/15
-setup: cwd: $here/15
-setup: prefix: sub/
-EOF
-	test_repo 15/sub "$here/15/.git" "$here/15"
-'
-
-test_expect_success '#15: GIT_DIR, GIT_WORKTREE=root(rel) in subdir' '
-	cat >15/sub/sub/expected <<EOF &&
-setup: git_dir: $here/15.git
-setup: worktree: $here/15
-setup: cwd: $here/15
-setup: prefix: sub/sub/
-EOF
-	test_repo 15/sub/sub "$here/15/.git" ../..
-'
-
-test_expect_success '#15: GIT_DIR(rel), GIT_WORK_TREE=wt at root' '
-	cat >15/expected <<EOF &&
-setup: git_dir: $here/15.git
-setup: worktree: $here/15/wt
-setup: cwd: $here/15
-setup: prefix: (null)
-EOF
-	test_repo 15 .git "$here/15/wt"
-'
-
-test_expect_success '#15: GIT_DIR(rel), GIT_WORK_TREE=wt(rel) at root' '
-	cat >15/expected <<EOF &&
-setup: git_dir: $here/15.git
-setup: worktree: $here/15/wt
-setup: cwd: $here/15
-setup: prefix: (null)
-EOF
-	test_repo 15 .git wt
-'
-
-test_expect_success '#15: GIT_DIR, GIT_WORK_TREE=wt(rel) at root' '
-	cat >15/expected <<EOF &&
-setup: git_dir: $here/15.git
-setup: worktree: $here/15/wt
-setup: cwd: $here/15
-setup: prefix: (null)
-EOF
-	test_repo 15 "$here/15/.git" wt
-'
-
-test_expect_success '#15: GIT_DIR, GIT_WORK_TREE=wt at root' '
-	cat >15/expected <<EOF &&
-setup: git_dir: $here/15.git
-setup: worktree: $here/15/wt
-setup: cwd: $here/15
-setup: prefix: (null)
-EOF
-	test_repo 15 "$here/15/.git" "$here/15/wt"
-'
-
-test_expect_success '#15: GIT_DIR(rel), GIT_WORK_TREE=wt in subdir' '
-	cat >15/sub/sub/expected <<EOF &&
-setup: git_dir: $here/15.git
-setup: worktree: $here/15/wt
-setup: cwd: $here/15/sub/sub
-setup: prefix: (null)
-EOF
-	test_repo 15/sub/sub ../../.git "$here/15/wt"
-'
-
-test_expect_success '#15: GIT_DIR(rel), GIT_WORK_TREE=wt(rel) in subdir' '
-	cat >15/sub/sub/expected <<EOF &&
-setup: git_dir: $here/15.git
-setup: worktree: $here/15/wt
-setup: cwd: $here/15/sub/sub
-setup: prefix: (null)
-EOF
-	test_repo 15/sub/sub ../../.git ../../wt
-'
-
-test_expect_success '#15: GIT_DIR, GIT_WORK_TREE=wt(rel) in subdir' '
-	cat >15/sub/sub/expected <<EOF &&
-setup: git_dir: $here/15.git
-setup: worktree: $here/15/wt
-setup: cwd: $here/15/sub/sub
-setup: prefix: (null)
-EOF
-	test_repo 15/sub/sub "$here/15/.git" ../../wt
-'
-
-test_expect_success '#15: GIT_DIR, GIT_WORK_TREE=wt in subdir' '
-	cat >15/sub/sub/expected <<EOF &&
-setup: git_dir: $here/15.git
-setup: worktree: $here/15/wt
-setup: cwd: $here/15/sub/sub
-setup: prefix: (null)
-EOF
-	test_repo 15/sub/sub "$here/15/.git" "$here/15/wt"
-'
-
-test_expect_success '#15: GIT_DIR(rel), GIT_WORK_TREE=.. at root' '
-	cat >15/expected <<EOF &&
-setup: git_dir: $here/15.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 15/
-EOF
-	test_repo 15 .git "$here"
-'
-
-test_expect_success '#15: GIT_DIR(rel), GIT_WORK_TREE=..(rel) at root' '
-	cat >15/expected <<EOF &&
-setup: git_dir: $here/15.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 15/
-EOF
-	test_repo 15 .git ..
-'
-
-test_expect_success '#15: GIT_DIR, GIT_WORK_TREE=..(rel) at root' '
-	cat >15/expected <<EOF &&
-setup: git_dir: $here/15.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 15/
-EOF
-	test_repo 15 "$here/15/.git" ..
-'
-
-test_expect_success '#15: GIT_DIR, GIT_WORK_TREE=.. at root' '
-	cat >15/expected <<EOF &&
-setup: git_dir: $here/15.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 15/
-EOF
-	test_repo 15 "$here/15/.git" "$here"
-'
-
-test_expect_success '#15: GIT_DIR(rel), GIT_WORK_TREE=.. in subdir' '
-	cat >15/sub/sub/expected <<EOF &&
-setup: git_dir: $here/15.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 15/sub/sub/
-EOF
-	test_repo 15/sub/sub ../../.git "$here"
-'
-
-test_expect_success '#15: GIT_DIR(rel), GIT_WORK_TREE=..(rel) in subdir' '
-	cat >15/sub/sub/expected <<EOF &&
-setup: git_dir: $here/15.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 15/sub/sub/
-EOF
-	test_repo 15/sub/sub ../../.git ../../..
-'
-
-test_expect_success '#15: GIT_DIR, GIT_WORK_TREE=..(rel) in subdir' '
-	cat >15/sub/sub/expected <<EOF &&
-setup: git_dir: $here/15.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 15/sub/sub/
-EOF
-	test_repo 15/sub/sub "$here/15/.git" ../../../
-'
-
-test_expect_success '#15: GIT_DIR, GIT_WORK_TREE=.. in subdir' '
-	cat >15/sub/sub/expected <<EOF &&
-setup: git_dir: $here/15.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 15/sub/sub/
-EOF
-	test_repo 15/sub/sub "$here/15/.git" "$here"
-'
-
-#
-# case #16.1
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is not set
-#  - GIT_DIR is not set
-#  - core.worktree is not set
-#  - .git is a directory
-#  - cwd is inside .git
-#
-# Output:
-#
-#  - no worktree
-#  - cwd is unchanged
-#  - prefix is NULL
-#  - git_dir is set
-#  - cwd can't be outside worktree
-
-test_expect_success '#16.1: setup' '
-	sane_unset GIT_DIR GIT_WORK_TREE &&
-	mkdir 16 16/sub &&
-	cd 16 &&
-	git init &&
-	mkdir .git/wt .git/wt/sub &&
-	cd ..
-'
-
-test_expect_success '#16.1: at .git' '
-	cat >16/.git/expected <<EOF &&
-setup: git_dir: .
-setup: worktree: (null)
-setup: cwd: $here/16/.git
-setup: prefix: (null)
-EOF
-	test_repo 16/.git
-'
-
-test_expect_success '#16.1: in .git/wt' '
-	cat >16/.git/wt/expected <<EOF &&
-setup: git_dir: $here/16/.git
-setup: worktree: (null)
-setup: cwd: $here/16/.git/wt
-setup: prefix: (null)
-EOF
-	test_repo 16/.git/wt
-'
-
-test_expect_success '#16.1: in .git/wt/sub' '
-	cat >16/.git/wt/sub/expected <<EOF &&
-setup: git_dir: $here/16/.git
-setup: worktree: (null)
-setup: cwd: $here/16/.git/wt/sub
-setup: prefix: (null)
-EOF
-	test_repo 16/.git/wt/sub
-'
-
-#
-# case #16.2
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is not set
-#  - GIT_DIR is not set
-#  - core.worktree is not set
-#  - .git is a directory
-#  - core.bare is set
-#
-# Output:
-#
-#  - no worktree
-#  - cwd is unchanged
-#  - prefix is NULL
-#  - git_dir is set
-#  - cwd can't be outside worktree
-
-test_expect_success '#16.2: setup' '
-	git config --file="$here/16/.git/config" core.bare true
-'
-
-test_expect_success '#16.2: at .git' '
-	cat >16/.git/expected <<EOF &&
-setup: git_dir: .
-setup: worktree: (null)
-setup: cwd: $here/16/.git
-setup: prefix: (null)
-EOF
-	test_repo 16/.git
-'
-
-test_expect_success '#16.2: in .git/wt' '
-	cat >16/.git/wt/expected <<EOF &&
-setup: git_dir: $here/16/.git
-setup: worktree: (null)
-setup: cwd: $here/16/.git/wt
-setup: prefix: (null)
-EOF
-	test_repo 16/.git/wt
-'
-
-test_expect_success '#16.2: in .git/wt/sub' '
-	cat >16/.git/wt/sub/expected <<EOF &&
-setup: git_dir: $here/16/.git
-setup: worktree: (null)
-setup: cwd: $here/16/.git/wt/sub
-setup: prefix: (null)
-EOF
-	test_repo 16/.git/wt/sub
-'
-
-test_expect_success '#16.2: at root' '
-	cat >16/expected <<EOF &&
-setup: git_dir: .git
-setup: worktree: (null)
-setup: cwd: $here/16
-setup: prefix: (null)
-EOF
-	test_repo 16
-'
-
-test_expect_success '#16.2: in subdir' '
-	cat >16/sub/expected <<EOF &&
-setup: git_dir: $here/16/.git
-setup: worktree: (null)
-setup: cwd: $here/16/sub
-setup: prefix: (null)
-EOF
-	test_repo 16/sub
-'
-
-#
-# case #17.1
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is set
-#  - GIT_DIR is not set
-#  - core.worktree is not set
-#  - .git is a directory
-#  - cwd is inside .git
-#
-# Output:
-#
-# GIT_WORK_TREE is ignored -> #16.1 (with warnings perhaps)
-
-test_expect_success '#17.1: setup' '
-	sane_unset GIT_DIR GIT_WORK_TREE &&
-	mkdir 17 17/sub &&
-	cd 17 &&
-	git init &&
-	mkdir .git/wt .git/wt/sub &&
-	GIT_WORK_TREE=non-existent &&
-	export GIT_WORK_TREE &&
-	cd ..
-'
-
-test_expect_success '#17.1: at .git' '
-	cat >17/.git/expected <<EOF &&
-setup: git_dir: .
-setup: worktree: (null)
-setup: cwd: $here/17/.git
-setup: prefix: (null)
-EOF
-	test_repo 17/.git
-'
-
-test_expect_success '#17.1: in .git/wt' '
-	cat >17/.git/wt/expected <<EOF &&
-setup: git_dir: $here/17/.git
-setup: worktree: (null)
-setup: cwd: $here/17/.git/wt
-setup: prefix: (null)
-EOF
-	test_repo 17/.git/wt
-'
-
-test_expect_success '#17.1: in .git/wt/sub' '
-	cat >17/.git/wt/sub/expected <<EOF &&
-setup: git_dir: $here/17/.git
-setup: worktree: (null)
-setup: cwd: $here/17/.git/wt/sub
-setup: prefix: (null)
-EOF
-	test_repo 17/.git/wt/sub
-'
-
-#
-# case #17.2
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is set
-#  - GIT_DIR is not set
-#  - core.worktree is not set
-#  - .git is a directory
-#  - core.bare is set
-#
-# Output:
-#
-# GIT_WORK_TREE is ignored -> #16.2 (with warnings perhaps)
-
-test_expect_success '#17.2: setup' '
-	git config --file="$here/17/.git/config" core.bare true
-'
-
-test_expect_success '#17.2: at .git' '
-	cat >17/.git/expected <<EOF &&
-setup: git_dir: .
-setup: worktree: (null)
-setup: cwd: $here/17/.git
-setup: prefix: (null)
-EOF
-	test_repo 17/.git
-'
-
-test_expect_success '#17.2: in .git/wt' '
-	cat >17/.git/wt/expected <<EOF &&
-setup: git_dir: $here/17/.git
-setup: worktree: (null)
-setup: cwd: $here/17/.git/wt
-setup: prefix: (null)
-EOF
-	test_repo 17/.git/wt
-'
-
-test_expect_success '#17.2: in .git/wt/sub' '
-	cat >17/.git/wt/sub/expected <<EOF &&
-setup: git_dir: $here/17/.git
-setup: worktree: (null)
-setup: cwd: $here/17/.git/wt/sub
-setup: prefix: (null)
-EOF
-	test_repo 17/.git/wt/sub
-'
-
-test_expect_success '#17.2: at root' '
-	cat >17/expected <<EOF &&
-setup: git_dir: .git
-setup: worktree: (null)
-setup: cwd: $here/17
-setup: prefix: (null)
-EOF
-	test_repo 17
-'
-
-test_expect_success '#17.2: in subdir' '
-	cat >17/sub/expected <<EOF &&
-setup: git_dir: $here/17/.git
-setup: worktree: (null)
-setup: cwd: $here/17/sub
-setup: prefix: (null)
-EOF
-	test_repo 17/sub
-'
-
-#
-# case #18
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is not set
-#  - GIT_DIR is set
-#  - core.worktree is not set
-#  - .git is a directory
-#  - core.bare is set
-#
-# Output:
-#
-#  - no worktree (rule #8)
-#  - cwd is unchanged
-#  - prefix is NULL
-#  - git_dir is set to $GIT_DIR
-#  - cwd can't be outside worktree
-
-test_expect_success '#18: setup' '
-	sane_unset GIT_DIR GIT_WORK_TREE &&
-	mkdir 18 18/sub &&
-	cd 18 &&
-	git init &&
-	mkdir .git/wt .git/wt/sub &&
-	git config core.bare true &&
-	cd ..
-'
-
-test_expect_success '#18: (rel) at root' '
-	cat >18/expected <<EOF &&
-setup: git_dir: .git
-setup: worktree: (null)
-setup: cwd: $here/18
-setup: prefix: (null)
-EOF
-	 test_repo 18 .git
-'
-
-test_expect_success '#18: at root' '
-	cat >18/expected <<EOF &&
-setup: git_dir: $here/18/.git
-setup: worktree: (null)
-setup: cwd: $here/18
-setup: prefix: (null)
-EOF
-	 test_repo 18 "$here/18/.git"
-'
-
-test_expect_success '#18: (rel) in subdir' '
-	cat >18/sub/expected <<EOF &&
-setup: git_dir: ../.git
-setup: worktree: (null)
-setup: cwd: $here/18/sub
-setup: prefix: (null)
-EOF
-	test_repo 18/sub ../.git
-'
-
-test_expect_success '#18: in subdir' '
-	cat >18/sub/expected <<EOF &&
-setup: git_dir: $here/18/.git
-setup: worktree: (null)
-setup: cwd: $here/18/sub
-setup: prefix: (null)
-EOF
-	test_repo 18/sub "$here/18/.git"
-'
-
-#
-# case #19
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is set
-#  - GIT_DIR is set
-#  - .git is a directory
-#  - core.worktree is not set
-#  - core.bare is set
-#
-# Output:
-#
-# bare repo is overridden by GIT_WORK_TREE -> #3
-
+# Case #19: GIT_DIR + GIT_WORK_TREE suppresses bareness.
 test_expect_success '#19: setup' '
-	sane_unset GIT_DIR GIT_WORK_TREE &&
-	mkdir 19 19/sub 19/sub/sub 19.wt 19.wt/sub 19/wt 19/wt/sub &&
-	cd 19 &&
-	git init &&
-	git config core.bare true &&
-	cd ..
-'
-
-test_expect_success '#19: GIT_DIR(rel), GIT_WORK_TREE=root at root' '
-	cat >19/expected <<EOF &&
-setup: git_dir: .git
-setup: worktree: $here/19
-setup: cwd: $here/19
-setup: prefix: (null)
-EOF
-	test_repo 19 .git "$here/19"
-'
-
-test_expect_success '#19: GIT_DIR(rel), GIT_WORK_TREE=root(rel) at root' '
-	cat >19/expected <<EOF &&
-setup: git_dir: .git
-setup: worktree: $here/19
-setup: cwd: $here/19
-setup: prefix: (null)
-EOF
-	test_repo 19 .git .
-'
-
-test_expect_success '#19: GIT_DIR, GIT_WORK_TREE=root at root' '
-	cat >19/expected <<EOF &&
-setup: git_dir: $here/19/.git
-setup: worktree: $here/19
-setup: cwd: $here/19
-setup: prefix: (null)
-EOF
-	test_repo 19 "$here/19/.git" "$here/19"
-'
-
-test_expect_success '#19: GIT_DIR, GIT_WORK_TREE=root(rel) at root' '
-	cat >19/expected <<EOF &&
-setup: git_dir: $here/19/.git
-setup: worktree: $here/19
-setup: cwd: $here/19
-setup: prefix: (null)
-EOF
-	test_repo 19 "$here/19/.git" .
-'
-
-test_expect_success '#19: GIT_DIR(rel), GIT_WORKTREE=root in subdir' '
-	cat >19/sub/sub/expected <<EOF &&
-setup: git_dir: $here/19/.git
-setup: worktree: $here/19
-setup: cwd: $here/19
-setup: prefix: sub/sub/
-EOF
-	test_repo 19/sub/sub ../../.git "$here/19"
-'
-
-test_expect_success '#19: GIT_DIR(rel), GIT_WORKTREE=root(rel) in subdir' '
-	cat >19/sub/sub/expected <<EOF &&
-setup: git_dir: $here/19/.git
-setup: worktree: $here/19
-setup: cwd: $here/19
-setup: prefix: sub/sub/
-EOF
-	test_repo 19/sub/sub ../../.git ../..
-'
-
-test_expect_success '#19: GIT_DIR, GIT_WORKTREE=root in subdir' '
-	cat >19/sub/expected <<EOF &&
-setup: git_dir: $here/19/.git
-setup: worktree: $here/19
-setup: cwd: $here/19
-setup: prefix: sub/
-EOF
-	test_repo 19/sub "$here/19/.git" "$here/19"
-'
-
-test_expect_success '#19: GIT_DIR, GIT_WORKTREE=root(rel) in subdir' '
-	cat >19/sub/sub/expected <<EOF &&
-setup: git_dir: $here/19/.git
-setup: worktree: $here/19
-setup: cwd: $here/19
-setup: prefix: sub/sub/
-EOF
-	test_repo 19/sub/sub "$here/19/.git" ../..
-'
-
-test_expect_success '#19: GIT_DIR(rel), GIT_WORK_TREE=wt at root' '
-	cat >19/expected <<EOF &&
-setup: git_dir: .git
-setup: worktree: $here/19/wt
-setup: cwd: $here/19
-setup: prefix: (null)
-EOF
-	test_repo 19 .git "$here/19/wt"
-'
-
-test_expect_success '#19: GIT_DIR(rel), GIT_WORK_TREE=wt(rel) at root' '
-	cat >19/expected <<EOF &&
-setup: git_dir: .git
-setup: worktree: $here/19/wt
-setup: cwd: $here/19
-setup: prefix: (null)
-EOF
-	test_repo 19 .git wt
-'
-
-test_expect_success '#19: GIT_DIR, GIT_WORK_TREE=wt(rel) at root' '
-	cat >19/expected <<EOF &&
-setup: git_dir: $here/19/.git
-setup: worktree: $here/19/wt
-setup: cwd: $here/19
-setup: prefix: (null)
-EOF
-	test_repo 19 "$here/19/.git" wt
-'
-
-test_expect_success '#19: GIT_DIR, GIT_WORK_TREE=wt at root' '
-	cat >19/expected <<EOF &&
-setup: git_dir: $here/19/.git
-setup: worktree: $here/19/wt
-setup: cwd: $here/19
-setup: prefix: (null)
-EOF
-	test_repo 19 "$here/19/.git" "$here/19/wt"
-'
-
-test_expect_success '#19: GIT_DIR(rel), GIT_WORK_TREE=wt in subdir' '
-	cat >19/sub/sub/expected <<EOF &&
-setup: git_dir: ../../.git
-setup: worktree: $here/19/wt
-setup: cwd: $here/19/sub/sub
-setup: prefix: (null)
-EOF
-	test_repo 19/sub/sub ../../.git "$here/19/wt"
-'
-
-test_expect_success '#19: GIT_DIR(rel), GIT_WORK_TREE=wt(rel) in subdir' '
-	cat >19/sub/sub/expected <<EOF &&
-setup: git_dir: ../../.git
-setup: worktree: $here/19/wt
-setup: cwd: $here/19/sub/sub
-setup: prefix: (null)
-EOF
-	test_repo 19/sub/sub ../../.git ../../wt
-'
-
-test_expect_success '#19: GIT_DIR, GIT_WORK_TREE=wt(rel) in subdir' '
-	cat >19/sub/sub/expected <<EOF &&
-setup: git_dir: $here/19/.git
-setup: worktree: $here/19/wt
-setup: cwd: $here/19/sub/sub
-setup: prefix: (null)
-EOF
-	test_repo 19/sub/sub "$here/19/.git" ../../wt
-'
-
-test_expect_success '#19: GIT_DIR, GIT_WORK_TREE=wt in subdir' '
-	cat >19/sub/sub/expected <<EOF &&
-setup: git_dir: $here/19/.git
-setup: worktree: $here/19/wt
-setup: cwd: $here/19/sub/sub
-setup: prefix: (null)
-EOF
-	test_repo 19/sub/sub "$here/19/.git" "$here/19/wt"
-'
-
-test_expect_success '#19: GIT_DIR(rel), GIT_WORK_TREE=.. at root' '
-	cat >19/expected <<EOF &&
-setup: git_dir: $here/19/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 19/
-EOF
-	test_repo 19 .git "$here"
-'
-
-test_expect_success '#19: GIT_DIR(rel), GIT_WORK_TREE=..(rel) at root' '
-	cat >19/expected <<EOF &&
-setup: git_dir: $here/19/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 19/
-EOF
-	test_repo 19 .git ..
-'
-
-test_expect_success '#19: GIT_DIR, GIT_WORK_TREE=..(rel) at root' '
-	cat >19/expected <<EOF &&
-setup: git_dir: $here/19/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 19/
-EOF
-	test_repo 19 "$here/19/.git" ..
-'
-
-test_expect_success '#19: GIT_DIR, GIT_WORK_TREE=.. at root' '
-	cat >19/expected <<EOF &&
-setup: git_dir: $here/19/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 19/
-EOF
-	test_repo 19 "$here/19/.git" "$here"
-'
-
-test_expect_success '#19: GIT_DIR(rel), GIT_WORK_TREE=.. in subdir' '
-	cat >19/sub/sub/expected <<EOF &&
-setup: git_dir: $here/19/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 19/sub/sub/
-EOF
-	test_repo 19/sub/sub ../../.git "$here"
-'
-
-test_expect_success '#19: GIT_DIR(rel), GIT_WORK_TREE=..(rel) in subdir' '
-	cat >19/sub/sub/expected <<EOF &&
-setup: git_dir: $here/19/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 19/sub/sub/
-EOF
-	test_repo 19/sub/sub ../../.git ../../..
-'
-
-test_expect_success '#19: GIT_DIR, GIT_WORK_TREE=..(rel) in subdir' '
-	cat >19/sub/sub/expected <<EOF &&
-setup: git_dir: $here/19/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 19/sub/sub/
-EOF
-	test_repo 19/sub/sub "$here/19/.git" ../../../
-'
-
-test_expect_success '#19: GIT_DIR, GIT_WORK_TREE=.. in subdir' '
-	cat >19/sub/sub/expected <<EOF &&
-setup: git_dir: $here/19/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 19/sub/sub/
-EOF
-	test_repo 19/sub/sub "$here/19/.git" "$here"
-'
-
-#
-# case #20.1
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is not set
-#  - GIT_DIR is not set
-#  - core.worktree is set
-#  - .git is a directory
-#  - cwd is inside .git
-#
-# Output:
-#
-# core.worktree is ignored -> #16.1
-
-test_expect_success '#20.1: setup' '
-	sane_unset GIT_DIR GIT_WORK_TREE &&
-	mkdir 20 20/sub &&
-	cd 20 &&
-	git init &&
-	git config core.worktree non-existent &&
-	mkdir .git/wt .git/wt/sub &&
-	cd ..
-'
-
-test_expect_success '#20.1: at .git' '
-	cat >20/.git/expected <<EOF &&
-setup: git_dir: .
-setup: worktree: (null)
-setup: cwd: $here/20/.git
-setup: prefix: (null)
-EOF
-	test_repo 20/.git
-'
-
-test_expect_success '#20.1: in .git/wt' '
-	cat >20/.git/wt/expected <<EOF &&
-setup: git_dir: $here/20/.git
-setup: worktree: (null)
-setup: cwd: $here/20/.git/wt
-setup: prefix: (null)
-EOF
-	test_repo 20/.git/wt
-'
-
-test_expect_success '#20.1: in .git/wt/sub' '
-	cat >20/.git/wt/sub/expected <<EOF &&
-setup: git_dir: $here/20/.git
-setup: worktree: (null)
-setup: cwd: $here/20/.git/wt/sub
-setup: prefix: (null)
-EOF
-	test_repo 20/.git/wt/sub
-'
-
-#
-# case #20.2
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is not set
-#  - GIT_DIR is not set
-#  - core.worktree is set
-#  - .git is a directory
-#  - core.bare is set
-#
-# Output:
-#
-# core.worktree is ignored -> #16.2
-
-test_expect_success '#20.2: setup' '
-	git config --file="$here/20/.git/config" core.bare true
-'
-
-test_expect_success '#20.2: at .git' '
-	cat >20/.git/expected <<EOF &&
-setup: git_dir: .
-setup: worktree: (null)
-setup: cwd: $here/20/.git
-setup: prefix: (null)
-EOF
-	test_repo 20/.git
-'
-
-test_expect_success '#20.2: in .git/wt' '
-	cat >20/.git/wt/expected <<EOF &&
-setup: git_dir: $here/20/.git
-setup: worktree: (null)
-setup: cwd: $here/20/.git/wt
-setup: prefix: (null)
-EOF
-	test_repo 20/.git/wt
-'
-
-test_expect_success '#20.2: in .git/wt/sub' '
-	cat >20/.git/wt/sub/expected <<EOF &&
-setup: git_dir: $here/20/.git
-setup: worktree: (null)
-setup: cwd: $here/20/.git/wt/sub
-setup: prefix: (null)
-EOF
-	test_repo 20/.git/wt/sub
-'
-
-test_expect_success '#20.2: at root' '
-	cat >20/expected <<EOF &&
-setup: git_dir: .git
-setup: worktree: (null)
-setup: cwd: $here/20
-setup: prefix: (null)
-EOF
-	test_repo 20
-'
-
-test_expect_success '#20.2: in subdir' '
-	cat >20/sub/expected <<EOF &&
-setup: git_dir: $here/20/.git
-setup: worktree: (null)
-setup: cwd: $here/20/sub
-setup: prefix: (null)
-EOF
-	test_repo 20/sub
-'
-
-#
-# case #21.1
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is set
-#  - GIT_DIR is not set
-#  - core.worktree is set
-#  - .git is a directory
-#  - cwd is inside .git
-#
-# Output:
-#
-# GIT_WORK_TREE/core.worktree are ignored -> #20.1
-
-test_expect_success '#21.1: setup' '
-	sane_unset GIT_DIR GIT_WORK_TREE &&
-	mkdir 21 21/sub &&
-	cd 21 &&
-	git init &&
-	git config core.worktree non-existent &&
-	GIT_WORK_TREE=non-existent-too &&
-	export GIT_WORK_TREE &&
-	mkdir .git/wt .git/wt/sub &&
-	cd ..
-'
-
-test_expect_success '#21.1: at .git' '
-	cat >21/.git/expected <<EOF &&
-setup: git_dir: .
-setup: worktree: (null)
-setup: cwd: $here/21/.git
-setup: prefix: (null)
-EOF
-	test_repo 21/.git
-'
-
-test_expect_success '#21.1: in .git/wt' '
-	cat >21/.git/wt/expected <<EOF &&
-setup: git_dir: $here/21/.git
-setup: worktree: (null)
-setup: cwd: $here/21/.git/wt
-setup: prefix: (null)
-EOF
-	test_repo 21/.git/wt
-'
-
-test_expect_success '#21.1: in .git/wt/sub' '
-	cat >21/.git/wt/sub/expected <<EOF &&
-setup: git_dir: $here/21/.git
-setup: worktree: (null)
-setup: cwd: $here/21/.git/wt/sub
-setup: prefix: (null)
-EOF
-	test_repo 21/.git/wt/sub
-'
-
-#
-# case #21.2
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is set
-#  - GIT_DIR is not set
-#  - core.worktree is set
-#  - .git is a directory
-#  - core.bare is set
-#
-# Output:
-#
-# GIT_WORK_TREE/core.worktree are ignored -> #20.2
-
-test_expect_success '#21.2: setup' '
-	git config --file="$here/21/.git/config" core.bare true
-'
-
-test_expect_success '#21.2: at .git' '
-	cat >21/.git/expected <<EOF &&
-setup: git_dir: .
-setup: worktree: (null)
-setup: cwd: $here/21/.git
-setup: prefix: (null)
-EOF
-	test_repo 21/.git
-'
-
-test_expect_success '#21.2: in .git/wt' '
-	cat >21/.git/wt/expected <<EOF &&
-setup: git_dir: $here/21/.git
-setup: worktree: (null)
-setup: cwd: $here/21/.git/wt
-setup: prefix: (null)
-EOF
-	test_repo 21/.git/wt
-'
-
-test_expect_success '#21.2: in .git/wt/sub' '
-	cat >21/.git/wt/sub/expected <<EOF &&
-setup: git_dir: $here/21/.git
-setup: worktree: (null)
-setup: cwd: $here/21/.git/wt/sub
-setup: prefix: (null)
-EOF
-	test_repo 21/.git/wt/sub
-'
-
-test_expect_success '#21.2: at root' '
-	cat >21/expected <<EOF &&
-setup: git_dir: .git
-setup: worktree: (null)
-setup: cwd: $here/21
-setup: prefix: (null)
-EOF
-	test_repo 21
-'
-
-test_expect_success '#21.2: in subdir' '
-	cat >21/sub/expected <<EOF &&
-setup: git_dir: $here/21/.git
-setup: worktree: (null)
-setup: cwd: $here/21/sub
-setup: prefix: (null)
-EOF
-	test_repo 21/sub
-'
-
-#
-# case #22.1
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is not set
-#  - GIT_DIR is set
-#  - core.worktree is set
-#  - .git is a directory
-#  - cwd is inside .git
-#
-# Output:
-#
-# bare attribute is ignored
-#
-#  - worktree is at core.worktree
-#  - cwd is at worktree root
-#  - prefix is calculated
-#  - git_dir is at $GIT_DIR
-#  - cwd can be outside worktree
-
-test_expect_success '#22.1: setup' '
-	sane_unset GIT_DIR GIT_WORK_TREE &&
-	mkdir 22 &&
-	cd 22 &&
-	git init &&
-	mkdir .git/sub .git/wt .git/wt/sub &&
-	cd ..
-'
-
-test_expect_success '#22.1: GIT_DIR(rel), core.worktree=. at .git' '
-	cat >22/.git/expected <<EOF &&
-setup: git_dir: .
-setup: worktree: $here/22/.git
-setup: cwd: $here/22/.git
-setup: prefix: (null)
-EOF
-	git config --file="$here/22/.git/config" core.worktree "$here/22/.git" &&
-	test_repo 22/.git .
-'
-
-test_expect_success '#22.1: GIT_DIR(rel), core.worktree=.(rel) at .git' '
-	cat >22/.git/expected <<EOF &&
-setup: git_dir: .
-setup: worktree: $here/22/.git
-setup: cwd: $here/22/.git
-setup: prefix: (null)
-EOF
-	git config --file="$here/22/.git/config" core.worktree . &&
-	test_repo 22/.git .
-'
-
-test_expect_success '#22.1: GIT_DIR, core.worktree=. at .git' '
-	cat >22/.git/expected <<EOF &&
-setup: git_dir: $here/22/.git
-setup: worktree: $here/22/.git
-setup: cwd: $here/22/.git
-setup: prefix: (null)
-EOF
-	git config --file="$here/22/.git/config" core.worktree "$here/22/.git" &&
-	test_repo 22/.git "$here/22/.git"
-'
-
-test_expect_success '#22.1: GIT_DIR, core.worktree=.(rel) at root' '
-	cat >22/.git/expected <<EOF &&
-setup: git_dir: $here/22/.git
-setup: worktree: $here/22/.git
-setup: cwd: $here/22/.git
-setup: prefix: (null)
-EOF
-	git config --file="$here/22/.git/config" core.worktree . &&
-	test_repo 22/.git "$here/22/.git"
-'
-
-test_expect_success '#22.1: GIT_DIR(rel), core.worktree=. in .git/sub' '
-	cat >22/.git/sub/expected <<EOF &&
-setup: git_dir: $here/22/.git
-setup: worktree: $here/22/.git
-setup: cwd: $here/22/.git
-setup: prefix: sub/
-EOF
-	git config --file="$here/22/.git/config" core.worktree "$here/22/.git" &&
-	test_repo 22/.git/sub ..
-'
-
-test_expect_success '#22.1: GIT_DIR(rel), core.worktree=.(rel) in .git/sub' '
-	cat >22/.git/sub/expected <<EOF &&
-setup: git_dir: $here/22/.git
-setup: worktree: $here/22/.git
-setup: cwd: $here/22/.git
-setup: prefix: sub/
-EOF
-	git config --file="$here/22/.git/config" core.worktree . &&
-	test_repo 22/.git/sub/ ..
-'
-
-test_expect_success '#22.1: GIT_DIR, core.worktree=. in .git/sub' '
-	cat >22/.git/sub/expected <<EOF &&
-setup: git_dir: $here/22/.git
-setup: worktree: $here/22/.git
-setup: cwd: $here/22/.git
-setup: prefix: sub/
-EOF
-	git config --file="$here/22/.git/config" core.worktree "$here/22/.git" &&
-	test_repo 22/.git/sub "$here/22/.git"
-'
-
-test_expect_success '#22.1: GIT_DIR, core.worktree=.(rel) in .git/sub' '
-	cat >22/.git/sub/expected <<EOF &&
-setup: git_dir: $here/22/.git
-setup: worktree: $here/22/.git
-setup: cwd: $here/22/.git
-setup: prefix: sub/
-EOF
-	git config --file="$here/22/.git/config" core.worktree . &&
-	test_repo 22/.git/sub "$here/22/.git"
-'
-
-test_expect_success '#22.1: GIT_DIR(rel), core.worktree=wt at .git' '
-	cat >22/.git/expected <<EOF &&
-setup: git_dir: .
-setup: worktree: $here/22/.git/wt
-setup: cwd: $here/22/.git
-setup: prefix: (null)
-EOF
-	git config --file="$here/22/.git/config" core.worktree "$here/22/.git/wt" &&
-	test_repo 22/.git .
-'
-
-test_expect_success '#22.1: GIT_DIR(rel), core.worktree=wt(rel) at .git' '
-	cat >22/.git/expected <<EOF &&
-setup: git_dir: .
-setup: worktree: $here/22/.git/wt
-setup: cwd: $here/22/.git
-setup: prefix: (null)
-EOF
-	git config --file="$here/22/.git/config" core.worktree wt &&
-	test_repo 22/.git .
-'
-
-test_expect_success '#22.1: GIT_DIR, core.worktree=wt(rel) at .git' '
-	cat >22/.git/expected <<EOF &&
-setup: git_dir: $here/22/.git
-setup: worktree: $here/22/.git/wt
-setup: cwd: $here/22/.git
-setup: prefix: (null)
-EOF
-	git config --file="$here/22/.git/config" core.worktree wt &&
-	test_repo 22/.git "$here/22/.git"
-'
-
-test_expect_success '#22.1: GIT_DIR, core.worktree=wt at .git' '
-	cat >22/.git/expected <<EOF &&
-setup: git_dir: $here/22/.git
-setup: worktree: $here/22/.git/wt
-setup: cwd: $here/22/.git
-setup: prefix: (null)
-EOF
-	git config --file="$here/22/.git/config" core.worktree "$here/22/.git/wt" &&
-	test_repo 22/.git "$here/22/.git"
-'
-
-test_expect_success '#22.1: GIT_DIR(rel), core.worktree=wt in .git/sub' '
-	cat >22/.git/sub/expected <<EOF &&
-setup: git_dir: ..
-setup: worktree: $here/22/.git/wt
-setup: cwd: $here/22/.git/sub
-setup: prefix: (null)
-EOF
-	git config --file="$here/22/.git/config" core.worktree "$here/22/.git/wt" &&
-	test_repo 22/.git/sub ..
-'
-
-test_expect_success '#22.1: GIT_DIR(rel), core.worktree=wt(rel) in .git/sub' '
-	cat >22/.git/sub/expected <<EOF &&
-setup: git_dir: ..
-setup: worktree: $here/22/.git/wt
-setup: cwd: $here/22/.git/sub
-setup: prefix: (null)
-EOF
-	git config --file="$here/22/.git/config" core.worktree wt &&
-	test_repo 22/.git/sub ..
-'
-
-test_expect_success '#22.1: GIT_DIR, core.worktree=wt(rel) in .git/sub' '
-	cat >22/.git/sub/expected <<EOF &&
-setup: git_dir: $here/22/.git
-setup: worktree: $here/22/.git/wt
-setup: cwd: $here/22/.git/sub
-setup: prefix: (null)
-EOF
-	git config --file="$here/22/.git/config" core.worktree wt &&
-	test_repo 22/.git/sub "$here/22/.git"
-'
-
-test_expect_success '#22.1: GIT_DIR, core.worktree=wt in .git/sub' '
-	cat >22/.git/sub/expected <<EOF &&
-setup: git_dir: $here/22/.git
-setup: worktree: $here/22/.git/wt
-setup: cwd: $here/22/.git/sub
-setup: prefix: (null)
-EOF
-	git config --file="$here/22/.git/config" core.worktree "$here/22/.git/wt" &&
-	test_repo 22/.git/sub "$here/22/.git"
-'
-
-test_expect_success '#22.1: GIT_DIR(rel), core.worktree=.. at .git' '
-	cat >22/.git/expected <<EOF &&
-setup: git_dir: $here/22/.git
-setup: worktree: $here/22
-setup: cwd: $here/22
-setup: prefix: .git/
-EOF
-	git config --file="$here/22/.git/config" core.worktree "$here/22" &&
-	test_repo 22/.git .
-'
-
-test_expect_success '#22.1: GIT_DIR(rel), core.worktree=..(rel) at .git' '
-	cat >22/.git/expected <<EOF &&
-setup: git_dir: $here/22/.git
-setup: worktree: $here/22
-setup: cwd: $here/22
-setup: prefix: .git/
-EOF
-	git config --file="$here/22/.git/config" core.worktree .. &&
-	test_repo 22/.git .
-'
-
-test_expect_success '#22.1: GIT_DIR, core.worktree=..(rel) at .git' '
-	cat >22/.git/expected <<EOF &&
-setup: git_dir: $here/22/.git
-setup: worktree: $here/22
-setup: cwd: $here/22
-setup: prefix: .git/
-EOF
-	git config --file="$here/22/.git/config" core.worktree .. &&
-	test_repo 22/.git "$here/22/.git"
-'
-
-test_expect_success '#22.1: GIT_DIR, core.worktree=.. at .git' '
-	cat >22/.git/expected <<EOF &&
-setup: git_dir: $here/22/.git
-setup: worktree: $here/22
-setup: cwd: $here/22
-setup: prefix: .git/
-EOF
-	git config --file="$here/22/.git/config" core.worktree "$here/22" &&
-	test_repo 22/.git "$here/22/.git"
-'
-
-test_expect_success '#22.1: GIT_DIR(rel), core.worktree=.. in .git/sub' '
-	cat >22/.git/sub/expected <<EOF &&
-setup: git_dir: $here/22/.git
-setup: worktree: $here/22
-setup: cwd: $here/22
-setup: prefix: .git/sub/
-EOF
-	git config --file="$here/22/.git/config" core.worktree "$here/22" &&
-	test_repo 22/.git/sub ..
-'
-
-test_expect_success '#22.1: GIT_DIR(rel), core.worktree=..(rel) in .git/sub' '
-	cat >22/.git/sub/expected <<EOF &&
-setup: git_dir: $here/22/.git
-setup: worktree: $here/22
-setup: cwd: $here/22
-setup: prefix: .git/sub/
-EOF
-	git config --file="$here/22/.git/config" core.worktree .. &&
-	test_repo 22/.git/sub ..
-'
-
-test_expect_success '#22.1: GIT_DIR, core.worktree=..(rel) in .git/sub' '
-	cat >22/.git/sub/expected <<EOF &&
-setup: git_dir: $here/22/.git
-setup: worktree: $here/22
-setup: cwd: $here/22
-setup: prefix: .git/sub/
-EOF
-	git config --file="$here/22/.git/config" core.worktree .. &&
-	test_repo 22/.git/sub "$here/22/.git"
-'
-
-test_expect_success '#22.1: GIT_DIR, core.worktree=.. in .git/sub' '
-	cat >22/.git/sub/expected <<EOF &&
-setup: git_dir: $here/22/.git
-setup: worktree: $here/22
-setup: cwd: $here/22
-setup: prefix: .git/sub/
-EOF
-	git config --file="$here/22/.git/config" core.worktree "$here/22" &&
-	test_repo 22/.git/sub "$here/22/.git"
-'
-
-#
-# case #22.2
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is not set
-#  - GIT_DIR is set
-#  - core.worktree is set
-#  - .git is a directory
-#  - core.bare is set
-#
-# Output:
-#
-# core.worktree and core.bare conflict, won't fly.
-
-test_expect_success '#22.2: setup' '
-	git config --file="$here/22/.git/config" core.bare true
-'
-
-test_expect_success '#22.2: at .git' '
+	setup_repo 19 unset "" true &&
+	mkdir -p 19/sub/sub 19/wt/sub
+'
+run_wt_tests 19
+
+test_expect_success '#20a: core.worktree without GIT_DIR accepted (inside .git)' '
+	# Unlike case #16a.
+	setup_repo 20a "$here/20a" "" unset &&
+	mkdir -p 20a/.git/wt/sub &&
+	try_case 20a/.git unset unset \
+		"$here/20a/.git" "$here/20a" "$here/20a" .git/ 2>message &&
+	try_case 20a/.git/wt unset unset \
+		"$here/20a/.git" "$here/20a" "$here/20a" .git/wt/ &&
+	try_case 20a/.git/wt/sub unset unset \
+		"$here/20a/.git" "$here/20a" "$here/20a" .git/wt/sub/ &&
+	! test -s message
+'
+
+test_expect_success '#20b/c: core.worktree and core.bare conflict' '
+	setup_repo 20b non-existent "" true &&
+	mkdir -p 20b/.git/wt/sub &&
 	(
-	cd 22/.git &&
-	GIT_DIR=. &&
-	export GIT_DIR &&
-	test_must_fail git symbolic-ref HEAD 2>result &&
-	grep "core.bare and core.worktree do not make sense" result
-	)
+		cd 20b/.git &&
+		test_must_fail git symbolic-ref HEAD >/dev/null
+	) 2>message &&
+	grep "core.bare and core.worktree" message
 '
 
-test_expect_success '#22.2: at root' '
+# Case #21: core.worktree/GIT_WORK_TREE overrides core.bare' '
+test_expect_success '#21: setup, core.worktree warns before overriding core.bare' '
+	setup_repo 21 non-existent "" unset &&
+	mkdir -p 21/.git/wt/sub &&
 	(
-	cd 22 &&
-	GIT_DIR=.git &&
-	export GIT_DIR &&
-	test_must_fail git symbolic-ref HEAD 2>result &&
-	grep "core.bare and core.worktree do not make sense" result
-	)
+		cd 21/.git &&
+		GIT_WORK_TREE="$here/21" &&
+		export GIT_WORK_TREE &&
+		git symbolic-ref HEAD >/dev/null
+	) 2>message &&
+	! test -s message
+
+'
+run_wt_tests 21
+
+test_expect_success '#22a: core.worktree = GIT_DIR = .git dir' '
+	# like case #6.
+
+	setup_repo 22a "$here/22a/.git" "" unset &&
+	setup_repo 22ab . "" unset
+	mkdir -p 22a/.git/sub 22a/sub &&
+	mkdir -p 22ab/.git/sub 22ab/sub &&
+	try_case 22a/.git unset . \
+		. "$here/22a/.git" "$here/22a/.git" "(null)" &&
+	try_case 22a/.git unset "$here/22a/.git" \
+		"$here/22a/.git" "$here/22a/.git" "$here/22a/.git" "(null)" &&
+	try_case 22a/.git/sub unset .. \
+		"$here/22a/.git" "$here/22a/.git" "$here/22a/.git" sub/ &&
+	try_case 22a/.git/sub unset "$here/22a/.git" \
+		"$here/22a/.git" "$here/22a/.git" "$here/22a/.git" sub/ &&
+
+	try_case 22ab/.git unset . \
+		. "$here/22ab/.git" "$here/22ab/.git" "(null)" &&
+	try_case 22ab/.git unset "$here/22ab/.git" \
+		"$here/22ab/.git" "$here/22ab/.git" "$here/22ab/.git" "(null)" &&
+	try_case 22ab/.git/sub unset .. \
+		"$here/22ab/.git" "$here/22ab/.git" "$here/22ab/.git" sub/ &&
+	try_case 22ab/.git unset "$here/22ab/.git" \
+		"$here/22ab/.git" "$here/22ab/.git" "$here/22ab/.git" "(null)"
 '
 
-#
-# case #23
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is set
-#  - GIT_DIR is set
-#  - core.worktree is set
-#  - .git is a directory
-#  - core.bare is set
-#
-# Output:
-#
-# core.worktree is overridden by GIT_WORK_TREE -> #19
+test_expect_success '#22b: core.worktree child of .git, GIT_DIR=.git' '
+	setup_repo 22b "$here/22b/.git/wt" "" unset &&
+	setup_repo 22bb wt "" unset &&
+	mkdir -p 22b/.git/sub 22b/sub 22b/.git/wt/sub 22b/wt/sub &&
+	mkdir -p 22bb/.git/sub 22bb/sub 22bb/.git/wt 22bb/wt &&
 
+	try_case 22b/.git unset . \
+		. "$here/22b/.git/wt" "$here/22b/.git" "(null)" &&
+	try_case 22b/.git unset "$here/22b/.git" \
+		"$here/22b/.git" "$here/22b/.git/wt" "$here/22b/.git" "(null)" &&
+	try_case 22b/.git/sub unset .. \
+		.. "$here/22b/.git/wt" "$here/22b/.git/sub" "(null)" &&
+	try_case 22b/.git/sub unset "$here/22b/.git" \
+		"$here/22b/.git" "$here/22b/.git/wt" "$here/22b/.git/sub" "(null)" &&
+
+	try_case 22bb/.git unset . \
+		. "$here/22bb/.git/wt" "$here/22bb/.git" "(null)" &&
+	try_case 22bb/.git unset "$here/22bb/.git" \
+		"$here/22bb/.git" "$here/22bb/.git/wt" "$here/22bb/.git" "(null)" &&
+	try_case 22bb/.git/sub unset .. \
+		.. "$here/22bb/.git/wt" "$here/22bb/.git/sub" "(null)" &&
+	try_case 22bb/.git/sub unset "$here/22bb/.git" \
+		"$here/22bb/.git" "$here/22bb/.git/wt" "$here/22bb/.git/sub" "(null)"
+'
+
+test_expect_success '#22c: core.worktree = .git/.., GIT_DIR=.git' '
+	setup_repo 22c "$here/22c" "" unset &&
+	setup_repo 22cb .. "" unset &&
+	mkdir -p 22c/.git/sub 22c/sub &&
+	mkdir -p 22cb/.git/sub 22cb/sub &&
+
+	try_case 22c/.git unset . \
+		"$here/22c/.git" "$here/22c" "$here/22c" .git/ &&
+	try_case 22c/.git unset "$here/22c/.git" \
+		"$here/22c/.git" "$here/22c" "$here/22c" .git/ &&
+	try_case 22c/.git/sub unset .. \
+		"$here/22c/.git" "$here/22c" "$here/22c" .git/sub/ &&
+	try_case 22c/.git/sub unset "$here/22c/.git" \
+		"$here/22c/.git" "$here/22c" "$here/22c" .git/sub/ &&
+
+	try_case 22cb/.git unset . \
+		"$here/22cb/.git" "$here/22cb" "$here/22cb" .git/ &&
+	try_case 22cb/.git unset "$here/22cb/.git" \
+		"$here/22cb/.git" "$here/22cb" "$here/22cb" .git/ &&
+	try_case 22cb/.git/sub unset .. \
+		"$here/22cb/.git" "$here/22cb" "$here/22cb" .git/sub/ &&
+	try_case 22cb/.git/sub unset "$here/22cb/.git" \
+		"$here/22cb/.git" "$here/22cb" "$here/22cb" .git/sub/
+'
+
+test_expect_success '#22.2: core.worktree and core.bare conflict' '
+	setup_repo 22 "$here/22" "" true &&
+	(
+		cd 22/.git &&
+		GIT_DIR=. &&
+		export GIT_DIR &&
+		test_must_fail git symbolic-ref HEAD 2>result
+	) &&
+	(
+		cd 22 &&
+		GIT_DIR=.git &&
+		export GIT_DIR &&
+		test_must_fail git symbolic-ref HEAD 2>result
+	) &&
+	grep "core.bare and core.worktree" 22/.git/result &&
+	grep "core.bare and core.worktree" 22/result
+'
+
+# Case #23: GIT_DIR + GIT_WORK_TREE(+core.worktree) suppresses bareness.
 test_expect_success '#23: setup' '
-	sane_unset GIT_DIR GIT_WORK_TREE &&
-	mkdir 23 23/sub 23/sub/sub 23.wt 23.wt/sub 23/wt 23/wt/sub &&
-	cd 23 &&
-	git init &&
-	git config core.bare true &&
-	git config core.worktree non-existent &&
-	cd ..
+	setup_repo 23 non-existent "" true &&
+	mkdir -p 23/sub/sub 23/wt/sub
+'
+run_wt_tests 23
+
+test_expect_success '#24: bare repo has no worktree (gitfile case)' '
+	try_repo 24 unset unset unset gitfile true \
+		"$here/24.git" "(null)" "$here/24" "(null)" \
+		"$here/24.git" "(null)" "$here/24/sub" "(null)"
 '
 
-test_expect_success '#23: GIT_DIR(rel), GIT_WORK_TREE=root at root' '
-	cat >23/expected <<EOF &&
-setup: git_dir: .git
-setup: worktree: $here/23
-setup: cwd: $here/23
-setup: prefix: (null)
-EOF
-	test_repo 23 .git "$here/23"
+test_expect_success '#25: GIT_WORK_TREE accepted if GIT_DIR unset (bare gitfile case)' '
+	try_repo 25 "$here/25" unset unset gitfile true \
+		"$here/25.git" "$here/25" "$here/25" "(null)"  \
+		"$here/25.git" "$here/25" "$here/25" "sub/" 2>message &&
+	! test -s message
 '
 
-test_expect_success '#23: GIT_DIR(rel), GIT_WORK_TREE=root(rel) at root' '
-	cat >23/expected <<EOF &&
-setup: git_dir: .git
-setup: worktree: $here/23
-setup: cwd: $here/23
-setup: prefix: (null)
-EOF
-	test_repo 23 .git .
+test_expect_success '#26: bare repo has no worktree (GIT_DIR -> gitfile case)' '
+	try_repo 26 unset "$here/26/.git" unset gitfile true \
+		"$here/26.git" "(null)" "$here/26" "(null)" \
+		"$here/26.git" "(null)" "$here/26/sub" "(null)" &&
+	try_repo 26b unset .git unset gitfile true \
+		"$here/26b.git" "(null)" "$here/26b" "(null)" \
+		"$here/26b.git" "(null)" "$here/26b/sub" "(null)"
 '
 
-test_expect_success '#23: GIT_DIR, GIT_WORK_TREE=root at root' '
-	cat >23/expected <<EOF &&
-setup: git_dir: $here/23/.git
-setup: worktree: $here/23
-setup: cwd: $here/23
-setup: prefix: (null)
-EOF
-	test_repo 23 "$here/23/.git" "$here/23"
-'
-
-test_expect_success '#23: GIT_DIR, GIT_WORK_TREE=root(rel) at root' '
-	cat >23/expected <<EOF &&
-setup: git_dir: $here/23/.git
-setup: worktree: $here/23
-setup: cwd: $here/23
-setup: prefix: (null)
-EOF
-	test_repo 23 "$here/23/.git" .
-'
-
-test_expect_success '#23: GIT_DIR(rel), GIT_WORKTREE=root in subdir' '
-	cat >23/sub/sub/expected <<EOF &&
-setup: git_dir: $here/23/.git
-setup: worktree: $here/23
-setup: cwd: $here/23
-setup: prefix: sub/sub/
-EOF
-	test_repo 23/sub/sub ../../.git "$here/23"
-'
-
-test_expect_success '#23: GIT_DIR(rel), GIT_WORKTREE=root(rel) in subdir' '
-	cat >23/sub/sub/expected <<EOF &&
-setup: git_dir: $here/23/.git
-setup: worktree: $here/23
-setup: cwd: $here/23
-setup: prefix: sub/sub/
-EOF
-	test_repo 23/sub/sub ../../.git ../..
-'
-
-test_expect_success '#23: GIT_DIR, GIT_WORKTREE=root in subdir' '
-	cat >23/sub/expected <<EOF &&
-setup: git_dir: $here/23/.git
-setup: worktree: $here/23
-setup: cwd: $here/23
-setup: prefix: sub/
-EOF
-	test_repo 23/sub "$here/23/.git" "$here/23"
-'
-
-test_expect_success '#23: GIT_DIR, GIT_WORKTREE=root(rel) in subdir' '
-	cat >23/sub/sub/expected <<EOF &&
-setup: git_dir: $here/23/.git
-setup: worktree: $here/23
-setup: cwd: $here/23
-setup: prefix: sub/sub/
-EOF
-	test_repo 23/sub/sub "$here/23/.git" ../..
-'
-
-test_expect_success '#23: GIT_DIR(rel), GIT_WORK_TREE=wt at root' '
-	cat >23/expected <<EOF &&
-setup: git_dir: .git
-setup: worktree: $here/23/wt
-setup: cwd: $here/23
-setup: prefix: (null)
-EOF
-	test_repo 23 .git "$here/23/wt"
-'
-
-test_expect_success '#23: GIT_DIR(rel), GIT_WORK_TREE=wt(rel) at root' '
-	cat >23/expected <<EOF &&
-setup: git_dir: .git
-setup: worktree: $here/23/wt
-setup: cwd: $here/23
-setup: prefix: (null)
-EOF
-	test_repo 23 .git wt
-'
-
-test_expect_success '#23: GIT_DIR, GIT_WORK_TREE=wt(rel) at root' '
-	cat >23/expected <<EOF &&
-setup: git_dir: $here/23/.git
-setup: worktree: $here/23/wt
-setup: cwd: $here/23
-setup: prefix: (null)
-EOF
-	test_repo 23 "$here/23/.git" wt
-'
-
-test_expect_success '#23: GIT_DIR, GIT_WORK_TREE=wt at root' '
-	cat >23/expected <<EOF &&
-setup: git_dir: $here/23/.git
-setup: worktree: $here/23/wt
-setup: cwd: $here/23
-setup: prefix: (null)
-EOF
-	test_repo 23 "$here/23/.git" "$here/23/wt"
-'
-
-test_expect_success '#23: GIT_DIR(rel), GIT_WORK_TREE=wt in subdir' '
-	cat >23/sub/sub/expected <<EOF &&
-setup: git_dir: ../../.git
-setup: worktree: $here/23/wt
-setup: cwd: $here/23/sub/sub
-setup: prefix: (null)
-EOF
-	test_repo 23/sub/sub ../../.git "$here/23/wt"
-'
-
-test_expect_success '#23: GIT_DIR(rel), GIT_WORK_TREE=wt(rel) in subdir' '
-	cat >23/sub/sub/expected <<EOF &&
-setup: git_dir: ../../.git
-setup: worktree: $here/23/wt
-setup: cwd: $here/23/sub/sub
-setup: prefix: (null)
-EOF
-	test_repo 23/sub/sub ../../.git ../../wt
-'
-
-test_expect_success '#23: GIT_DIR, GIT_WORK_TREE=wt(rel) in subdir' '
-	cat >23/sub/sub/expected <<EOF &&
-setup: git_dir: $here/23/.git
-setup: worktree: $here/23/wt
-setup: cwd: $here/23/sub/sub
-setup: prefix: (null)
-EOF
-	test_repo 23/sub/sub "$here/23/.git" ../../wt
-'
-
-test_expect_success '#23: GIT_DIR, GIT_WORK_TREE=wt in subdir' '
-	cat >23/sub/sub/expected <<EOF &&
-setup: git_dir: $here/23/.git
-setup: worktree: $here/23/wt
-setup: cwd: $here/23/sub/sub
-setup: prefix: (null)
-EOF
-	test_repo 23/sub/sub "$here/23/.git" "$here/23/wt"
-'
-
-test_expect_success '#23: GIT_DIR(rel), GIT_WORK_TREE=.. at root' '
-	cat >23/expected <<EOF &&
-setup: git_dir: $here/23/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 23/
-EOF
-	test_repo 23 .git "$here"
-'
-
-test_expect_success '#23: GIT_DIR(rel), GIT_WORK_TREE=..(rel) at root' '
-	cat >23/expected <<EOF &&
-setup: git_dir: $here/23/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 23/
-EOF
-	test_repo 23 .git ..
-'
-
-test_expect_success '#23: GIT_DIR, GIT_WORK_TREE=..(rel) at root' '
-	cat >23/expected <<EOF &&
-setup: git_dir: $here/23/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 23/
-EOF
-	test_repo 23 "$here/23/.git" ..
-'
-
-test_expect_success '#23: GIT_DIR, GIT_WORK_TREE=.. at root' '
-	cat >23/expected <<EOF &&
-setup: git_dir: $here/23/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 23/
-EOF
-	test_repo 23 "$here/23/.git" "$here"
-'
-
-test_expect_success '#23: GIT_DIR(rel), GIT_WORK_TREE=.. in subdir' '
-	cat >23/sub/sub/expected <<EOF &&
-setup: git_dir: $here/23/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 23/sub/sub/
-EOF
-	test_repo 23/sub/sub ../../.git "$here"
-'
-
-test_expect_success '#23: GIT_DIR(rel), GIT_WORK_TREE=..(rel) in subdir' '
-	cat >23/sub/sub/expected <<EOF &&
-setup: git_dir: $here/23/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 23/sub/sub/
-EOF
-	test_repo 23/sub/sub ../../.git ../../..
-'
-
-test_expect_success '#23: GIT_DIR, GIT_WORK_TREE=..(rel) in subdir' '
-	cat >23/sub/sub/expected <<EOF &&
-setup: git_dir: $here/23/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 23/sub/sub/
-EOF
-	test_repo 23/sub/sub "$here/23/.git" ../../../
-'
-
-test_expect_success '#23: GIT_DIR, GIT_WORK_TREE=.. in subdir' '
-	cat >23/sub/sub/expected <<EOF &&
-setup: git_dir: $here/23/.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 23/sub/sub/
-EOF
-	test_repo 23/sub/sub "$here/23/.git" "$here"
-'
-
-#
-# case #24
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is not set
-#  - GIT_DIR is not set
-#  - core.worktree is not set
-#  - .git is a file
-#  - core.bare is set
-#
-# Output:
-#
-# #16.2 except git_dir is set according to .git file
-
-test_expect_success '#24: setup' '
-	sane_unset GIT_DIR GIT_WORK_TREE &&
-	mkdir 24 24/sub &&
-	cd 24 &&
-	git init &&
-	git config core.bare true &&
-	mv .git ../24.git &&
-	echo gitdir: ../24.git >.git &&
-	cd ..
-'
-
-test_expect_success '#24: at root' '
-	cat >24/expected <<EOF &&
-setup: git_dir: $here/24.git
-setup: worktree: (null)
-setup: cwd: $here/24
-setup: prefix: (null)
-EOF
-	test_repo 24
-'
-
-test_expect_success '#24: in subdir' '
-	cat >24/sub/expected <<EOF &&
-setup: git_dir: $here/24.git
-setup: worktree: (null)
-setup: cwd: $here/24/sub
-setup: prefix: (null)
-EOF
-	test_repo 24/sub
-'
-
-#
-# case #25
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is set
-#  - GIT_DIR is not set
-#  - core.worktree is not set
-#  - .git is a file
-#  - core.bare is set
-#
-# Output:
-#
-# #17.2 except git_dir is set according to .git file
-
-test_expect_success '#25: setup' '
-	sane_unset GIT_DIR GIT_WORK_TREE &&
-	mkdir 25 25/sub &&
-	cd 25 &&
-	git init &&
-	git config core.bare true &&
-	GIT_WORK_TREE=non-existent &&
-	export GIT_WORK_TREE &&
-	mv .git ../25.git &&
-	echo gitdir: ../25.git >.git &&
-	cd ..
-'
-
-test_expect_success '#25: at root' '
-	cat >25/expected <<EOF &&
-setup: git_dir: $here/25.git
-setup: worktree: (null)
-setup: cwd: $here/25
-setup: prefix: (null)
-EOF
-	test_repo 25
-'
-
-test_expect_success '#25: in subdir' '
-	cat >25/sub/expected <<EOF &&
-setup: git_dir: $here/25.git
-setup: worktree: (null)
-setup: cwd: $here/25/sub
-setup: prefix: (null)
-EOF
-	test_repo 25/sub
-'
-
-#
-# case #26
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is not set
-#  - GIT_DIR is set
-#  - core.worktree is not set
-#  - .git is a file
-#  - core.bare is set
-#
-# Output:
-#
-# #18 except git_dir is set according to .git file
-
-test_expect_success '#26: setup' '
-	sane_unset GIT_DIR GIT_WORK_TREE &&
-	mkdir 26 26/sub &&
-	cd 26 &&
-	git init &&
-	git config core.bare true &&
-	mv .git ../26.git &&
-	echo gitdir: ../26.git >.git &&
-	cd ..
-'
-
-test_expect_success '#26: (rel) at root' '
-	cat >26/expected <<EOF &&
-setup: git_dir: $here/26.git
-setup: worktree: (null)
-setup: cwd: $here/26
-setup: prefix: (null)
-EOF
-	 test_repo 26 .git
-'
-
-test_expect_success '#26: at root' '
-	cat >26/expected <<EOF &&
-setup: git_dir: $here/26.git
-setup: worktree: (null)
-setup: cwd: $here/26
-setup: prefix: (null)
-EOF
-	 test_repo 26 "$here/26/.git"
-'
-
-test_expect_success '#26: (rel) in subdir' '
-	cat >26/sub/expected <<EOF &&
-setup: git_dir: $here/26.git
-setup: worktree: (null)
-setup: cwd: $here/26/sub
-setup: prefix: (null)
-EOF
-	test_repo 26/sub ../.git
-'
-
-test_expect_success '#26: in subdir' '
-	cat >26/sub/expected <<EOF &&
-setup: git_dir: $here/26.git
-setup: worktree: (null)
-setup: cwd: $here/26/sub
-setup: prefix: (null)
-EOF
-	test_repo 26/sub "$here/26/.git"
-'
-
-#
-# case #27
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is set
-#  - GIT_DIR is set
-#  - .git is a file
-#  - core.worktree is not set
-#  - core.bare is set
-#
-# Output:
-#
-# #19 except git_dir is set according to .git file
-
+# Case #27: GIT_DIR + GIT_WORK_TREE suppresses bareness (with gitfile).
 test_expect_success '#27: setup' '
-	sane_unset GIT_DIR GIT_WORK_TREE &&
-	mkdir 27 27/sub 27/sub/sub 27.wt 27.wt/sub 27/wt 27/wt/sub &&
-	cd 27 &&
-	git init &&
-	git config core.bare true &&
-	mv .git ../27.git &&
-	echo gitdir: ../27.git >.git &&
-	cd ..
+	setup_repo 27 unset gitfile true &&
+	mkdir -p 27/sub/sub 27/wt/sub
 '
+run_wt_tests 27 gitfile
 
-test_expect_success '#27: GIT_DIR(rel), GIT_WORK_TREE=root at root' '
-	cat >27/expected <<EOF &&
-setup: git_dir: $here/27.git
-setup: worktree: $here/27
-setup: cwd: $here/27
-setup: prefix: (null)
-EOF
-	test_repo 27 .git "$here/27"
-'
-
-test_expect_success '#27: GIT_DIR(rel), GIT_WORK_TREE=root(rel) at root' '
-	cat >27/expected <<EOF &&
-setup: git_dir: $here/27.git
-setup: worktree: $here/27
-setup: cwd: $here/27
-setup: prefix: (null)
-EOF
-	test_repo 27 .git .
-'
-
-test_expect_success '#27: GIT_DIR, GIT_WORK_TREE=root at root' '
-	cat >27/expected <<EOF &&
-setup: git_dir: $here/27.git
-setup: worktree: $here/27
-setup: cwd: $here/27
-setup: prefix: (null)
-EOF
-	test_repo 27 "$here/27/.git" "$here/27"
-'
-
-test_expect_success '#27: GIT_DIR, GIT_WORK_TREE=root(rel) at root' '
-	cat >27/expected <<EOF &&
-setup: git_dir: $here/27.git
-setup: worktree: $here/27
-setup: cwd: $here/27
-setup: prefix: (null)
-EOF
-	test_repo 27 "$here/27/.git" .
-'
-
-test_expect_success '#27: GIT_DIR(rel), GIT_WORKTREE=root in subdir' '
-	cat >27/sub/sub/expected <<EOF &&
-setup: git_dir: $here/27.git
-setup: worktree: $here/27
-setup: cwd: $here/27
-setup: prefix: sub/sub/
-EOF
-	test_repo 27/sub/sub ../../.git "$here/27"
-'
-
-test_expect_success '#27: GIT_DIR(rel), GIT_WORKTREE=root(rel) in subdir' '
-	cat >27/sub/sub/expected <<EOF &&
-setup: git_dir: $here/27.git
-setup: worktree: $here/27
-setup: cwd: $here/27
-setup: prefix: sub/sub/
-EOF
-	test_repo 27/sub/sub ../../.git ../..
-'
-
-test_expect_success '#27: GIT_DIR, GIT_WORKTREE=root in subdir' '
-	cat >27/sub/expected <<EOF &&
-setup: git_dir: $here/27.git
-setup: worktree: $here/27
-setup: cwd: $here/27
-setup: prefix: sub/
-EOF
-	test_repo 27/sub "$here/27/.git" "$here/27"
-'
-
-test_expect_success '#27: GIT_DIR, GIT_WORKTREE=root(rel) in subdir' '
-	cat >27/sub/sub/expected <<EOF &&
-setup: git_dir: $here/27.git
-setup: worktree: $here/27
-setup: cwd: $here/27
-setup: prefix: sub/sub/
-EOF
-	test_repo 27/sub/sub "$here/27/.git" ../..
-'
-
-test_expect_success '#27: GIT_DIR(rel), GIT_WORK_TREE=wt at root' '
-	cat >27/expected <<EOF &&
-setup: git_dir: $here/27.git
-setup: worktree: $here/27/wt
-setup: cwd: $here/27
-setup: prefix: (null)
-EOF
-	test_repo 27 .git "$here/27/wt"
-'
-
-test_expect_success '#27: GIT_DIR(rel), GIT_WORK_TREE=wt(rel) at root' '
-	cat >27/expected <<EOF &&
-setup: git_dir: $here/27.git
-setup: worktree: $here/27/wt
-setup: cwd: $here/27
-setup: prefix: (null)
-EOF
-	test_repo 27 .git wt
-'
-
-test_expect_success '#27: GIT_DIR, GIT_WORK_TREE=wt(rel) at root' '
-	cat >27/expected <<EOF &&
-setup: git_dir: $here/27.git
-setup: worktree: $here/27/wt
-setup: cwd: $here/27
-setup: prefix: (null)
-EOF
-	test_repo 27 "$here/27/.git" wt
-'
-
-test_expect_success '#27: GIT_DIR, GIT_WORK_TREE=wt at root' '
-	cat >27/expected <<EOF &&
-setup: git_dir: $here/27.git
-setup: worktree: $here/27/wt
-setup: cwd: $here/27
-setup: prefix: (null)
-EOF
-	test_repo 27 "$here/27/.git" "$here/27/wt"
-'
-
-test_expect_success '#27: GIT_DIR(rel), GIT_WORK_TREE=wt in subdir' '
-	cat >27/sub/sub/expected <<EOF &&
-setup: git_dir: $here/27.git
-setup: worktree: $here/27/wt
-setup: cwd: $here/27/sub/sub
-setup: prefix: (null)
-EOF
-	test_repo 27/sub/sub ../../.git "$here/27/wt"
-'
-
-test_expect_success '#27: GIT_DIR(rel), GIT_WORK_TREE=wt(rel) in subdir' '
-	cat >27/sub/sub/expected <<EOF &&
-setup: git_dir: $here/27.git
-setup: worktree: $here/27/wt
-setup: cwd: $here/27/sub/sub
-setup: prefix: (null)
-EOF
-	test_repo 27/sub/sub ../../.git ../../wt
-'
-
-test_expect_success '#27: GIT_DIR, GIT_WORK_TREE=wt(rel) in subdir' '
-	cat >27/sub/sub/expected <<EOF &&
-setup: git_dir: $here/27.git
-setup: worktree: $here/27/wt
-setup: cwd: $here/27/sub/sub
-setup: prefix: (null)
-EOF
-	test_repo 27/sub/sub "$here/27/.git" ../../wt
-'
-
-test_expect_success '#27: GIT_DIR, GIT_WORK_TREE=wt in subdir' '
-	cat >27/sub/sub/expected <<EOF &&
-setup: git_dir: $here/27.git
-setup: worktree: $here/27/wt
-setup: cwd: $here/27/sub/sub
-setup: prefix: (null)
-EOF
-	test_repo 27/sub/sub "$here/27/.git" "$here/27/wt"
-'
-
-test_expect_success '#27: GIT_DIR(rel), GIT_WORK_TREE=.. at root' '
-	cat >27/expected <<EOF &&
-setup: git_dir: $here/27.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 27/
-EOF
-	test_repo 27 .git "$here"
-'
-
-test_expect_success '#27: GIT_DIR(rel), GIT_WORK_TREE=..(rel) at root' '
-	cat >27/expected <<EOF &&
-setup: git_dir: $here/27.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 27/
-EOF
-	test_repo 27 .git ..
-'
-
-test_expect_success '#27: GIT_DIR, GIT_WORK_TREE=..(rel) at root' '
-	cat >27/expected <<EOF &&
-setup: git_dir: $here/27.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 27/
-EOF
-	test_repo 27 "$here/27/.git" ..
-'
-
-test_expect_success '#27: GIT_DIR, GIT_WORK_TREE=.. at root' '
-	cat >27/expected <<EOF &&
-setup: git_dir: $here/27.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 27/
-EOF
-	test_repo 27 "$here/27/.git" "$here"
-'
-
-test_expect_success '#27: GIT_DIR(rel), GIT_WORK_TREE=.. in subdir' '
-	cat >27/sub/sub/expected <<EOF &&
-setup: git_dir: $here/27.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 27/sub/sub/
-EOF
-	test_repo 27/sub/sub ../../.git "$here"
-'
-
-test_expect_success '#27: GIT_DIR(rel), GIT_WORK_TREE=..(rel) in subdir' '
-	cat >27/sub/sub/expected <<EOF &&
-setup: git_dir: $here/27.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 27/sub/sub/
-EOF
-	test_repo 27/sub/sub ../../.git ../../..
-'
-
-test_expect_success '#27: GIT_DIR, GIT_WORK_TREE=..(rel) in subdir' '
-	cat >27/sub/sub/expected <<EOF &&
-setup: git_dir: $here/27.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 27/sub/sub/
-EOF
-	test_repo 27/sub/sub "$here/27/.git" ../../../
-'
-
-test_expect_success '#27: GIT_DIR, GIT_WORK_TREE=.. in subdir' '
-	cat >27/sub/sub/expected <<EOF &&
-setup: git_dir: $here/27.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 27/sub/sub/
-EOF
-	test_repo 27/sub/sub "$here/27/.git" "$here"
-'
-
-#
-# case #28
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is not set
-#  - GIT_DIR is not set
-#  - core.worktree is set
-#  - .git is a file
-#  - core.bare is set
-#
-# Output:
-#
-# core.worktree is ignored -> #24
-
-test_expect_success '#28: setup' '
-	sane_unset GIT_DIR GIT_WORK_TREE &&
-	mkdir 28 28/sub &&
-	cd 28 &&
-	git init &&
-	git config core.bare true &&
-	git config core.worktree non-existent &&
-	mv .git ../28.git &&
-	echo gitdir: ../28.git >.git &&
-	cd ..
-'
-
-test_expect_success '#28: at root' '
-	cat >28/expected <<EOF &&
-setup: git_dir: $here/28.git
-setup: worktree: (null)
-setup: cwd: $here/28
-setup: prefix: (null)
-EOF
-	test_repo 28
-'
-
-test_expect_success '#28: in subdir' '
-	cat >28/sub/expected <<EOF &&
-setup: git_dir: $here/28.git
-setup: worktree: (null)
-setup: cwd: $here/28/sub
-setup: prefix: (null)
-EOF
-	test_repo 28/sub
-'
-
-#
-# case #29
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is set
-#  - GIT_DIR is not set
-#  - core.worktree is set
-#  - .git is a file
-#  - core.bare is set
-#
-# Output:
-#
-# GIT_WORK_TREE/core.worktree are ignored -> #28
-
-test_expect_success '#29: setup' '
-	sane_unset GIT_DIR GIT_WORK_TREE &&
-	mkdir 29 29/sub &&
-	cd 29 &&
-	git init &&
-	git config core.bare true &&
-	GIT_WORK_TREE=non-existent &&
-	export GIT_WORK_TREE &&
-	mv .git ../29.git &&
-	echo gitdir: ../29.git >.git &&
-	cd ..
-'
-
-test_expect_success '#29: at root' '
-	cat >29/expected <<EOF &&
-setup: git_dir: $here/29.git
-setup: worktree: (null)
-setup: cwd: $here/29
-setup: prefix: (null)
-EOF
-	test_repo 29
-'
-
-test_expect_success '#29: in subdir' '
-	cat >29/sub/expected <<EOF &&
-setup: git_dir: $here/29.git
-setup: worktree: (null)
-setup: cwd: $here/29/sub
-setup: prefix: (null)
-EOF
-	test_repo 29/sub
-'
-
-#
-# case #30
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is not set
-#  - GIT_DIR is set
-#  - core.worktree is set
-#  - .git is a file
-#  - core.bare is set
-#
-# Output:
-#
-# core.worktree and core.bare conflict, won't fly.
-
-test_expect_success '#30: setup' '
-	sane_unset GIT_DIR GIT_WORK_TREE &&
-	mkdir 30 &&
-	cd 30 &&
-	git init &&
-	git config core.bare true &&
-	git config core.worktree non-existent &&
-	mv .git ../30.git &&
-	echo gitdir: ../30.git >.git &&
-	cd ..
-'
-
-test_expect_success '#30: at root' '
+test_expect_success '#28: core.worktree and core.bare conflict (gitfile case)' '
+	setup_repo 28 "$here/28" gitfile true &&
 	(
-	cd 30 &&
-	GIT_DIR=.git &&
-	export GIT_DIR &&
-	test_must_fail git symbolic-ref HEAD 2>result &&
-	grep "core.bare and core.worktree do not make sense" result
-	)
+		cd 28 &&
+		test_must_fail git symbolic-ref HEAD
+	) 2>message &&
+	! grep "^warning:" message &&
+	grep "core.bare and core.worktree" message
 '
 
-#
-# case #31
-#
-############################################################
-#
-# Input:
-#
-#  - GIT_WORK_TREE is set
-#  - GIT_DIR is set
-#  - core.worktree is set
-#  - .git is a file
-#  - core.bare is set
-#
-# Output:
-#
-# #23 except git_dir is set according to .git file
+# Case #29: GIT_WORK_TREE(+core.worktree) overries core.bare (gitfile case).
+test_expect_success '#29: setup' '
+	setup_repo 29 non-existent gitfile true &&
+	mkdir -p 29/sub/sub 29/wt/sub
+	(
+		cd 29 &&
+		GIT_WORK_TREE="$here/29" &&
+		export GIT_WORK_TREE &&
+		git symbolic-ref HEAD >/dev/null
+	) 2>message &&
+	! test -s message
+'
+run_wt_tests 29 gitfile
 
+test_expect_success '#30: core.worktree and core.bare conflict (gitfile version)' '
+	# Just like case #22.
+	setup_repo 30 "$here/30" gitfile true &&
+	(
+		cd 30 &&
+		GIT_DIR=.git &&
+		export GIT_DIR &&
+		test_must_fail git symbolic-ref HEAD 2>result
+	) &&
+	grep "core.bare and core.worktree" 30/result
+'
+
+# Case #31: GIT_DIR + GIT_WORK_TREE(+core.worktree) suppresses
+# bareness (gitfile version).
 test_expect_success '#31: setup' '
-	sane_unset GIT_DIR GIT_WORK_TREE &&
-	mkdir 31 31/sub 31/sub/sub 31.wt 31.wt/sub 31/wt 31/wt/sub &&
-	cd 31 &&
-	git init &&
-	git config core.bare true &&
-	git config core.worktree non-existent &&
-	mv .git ../31.git &&
-	echo gitdir: ../31.git >.git &&
-	cd ..
-'
-
-test_expect_success '#31: GIT_DIR(rel), GIT_WORK_TREE=root at root' '
-	cat >31/expected <<EOF &&
-setup: git_dir: $here/31.git
-setup: worktree: $here/31
-setup: cwd: $here/31
-setup: prefix: (null)
-EOF
-	test_repo 31 .git "$here/31"
-'
-
-test_expect_success '#31: GIT_DIR(rel), GIT_WORK_TREE=root(rel) at root' '
-	cat >31/expected <<EOF &&
-setup: git_dir: $here/31.git
-setup: worktree: $here/31
-setup: cwd: $here/31
-setup: prefix: (null)
-EOF
-	test_repo 31 .git .
-'
-
-test_expect_success '#31: GIT_DIR, GIT_WORK_TREE=root at root' '
-	cat >31/expected <<EOF &&
-setup: git_dir: $here/31.git
-setup: worktree: $here/31
-setup: cwd: $here/31
-setup: prefix: (null)
-EOF
-	test_repo 31 "$here/31/.git" "$here/31"
-'
-
-test_expect_success '#31: GIT_DIR, GIT_WORK_TREE=root(rel) at root' '
-	cat >31/expected <<EOF &&
-setup: git_dir: $here/31.git
-setup: worktree: $here/31
-setup: cwd: $here/31
-setup: prefix: (null)
-EOF
-	test_repo 31 "$here/31/.git" .
-'
-
-test_expect_success '#31: GIT_DIR(rel), GIT_WORKTREE=root in subdir' '
-	cat >31/sub/sub/expected <<EOF &&
-setup: git_dir: $here/31.git
-setup: worktree: $here/31
-setup: cwd: $here/31
-setup: prefix: sub/sub/
-EOF
-	test_repo 31/sub/sub ../../.git "$here/31"
-'
-
-test_expect_success '#31: GIT_DIR(rel), GIT_WORKTREE=root(rel) in subdir' '
-	cat >31/sub/sub/expected <<EOF &&
-setup: git_dir: $here/31.git
-setup: worktree: $here/31
-setup: cwd: $here/31
-setup: prefix: sub/sub/
-EOF
-	test_repo 31/sub/sub ../../.git ../..
-'
-
-test_expect_success '#31: GIT_DIR, GIT_WORKTREE=root in subdir' '
-	cat >31/sub/expected <<EOF &&
-setup: git_dir: $here/31.git
-setup: worktree: $here/31
-setup: cwd: $here/31
-setup: prefix: sub/
-EOF
-	test_repo 31/sub "$here/31/.git" "$here/31"
-'
-
-test_expect_success '#31: GIT_DIR, GIT_WORKTREE=root(rel) in subdir' '
-	cat >31/sub/sub/expected <<EOF &&
-setup: git_dir: $here/31.git
-setup: worktree: $here/31
-setup: cwd: $here/31
-setup: prefix: sub/sub/
-EOF
-	test_repo 31/sub/sub "$here/31/.git" ../..
-'
-
-test_expect_success '#31: GIT_DIR(rel), GIT_WORK_TREE=wt at root' '
-	cat >31/expected <<EOF &&
-setup: git_dir: $here/31.git
-setup: worktree: $here/31/wt
-setup: cwd: $here/31
-setup: prefix: (null)
-EOF
-	test_repo 31 .git "$here/31/wt"
-'
-
-test_expect_success '#31: GIT_DIR(rel), GIT_WORK_TREE=wt(rel) at root' '
-	cat >31/expected <<EOF &&
-setup: git_dir: $here/31.git
-setup: worktree: $here/31/wt
-setup: cwd: $here/31
-setup: prefix: (null)
-EOF
-	test_repo 31 .git wt
-'
-
-test_expect_success '#31: GIT_DIR, GIT_WORK_TREE=wt(rel) at root' '
-	cat >31/expected <<EOF &&
-setup: git_dir: $here/31.git
-setup: worktree: $here/31/wt
-setup: cwd: $here/31
-setup: prefix: (null)
-EOF
-	test_repo 31 "$here/31/.git" wt
-'
-
-test_expect_success '#31: GIT_DIR, GIT_WORK_TREE=wt at root' '
-	cat >31/expected <<EOF &&
-setup: git_dir: $here/31.git
-setup: worktree: $here/31/wt
-setup: cwd: $here/31
-setup: prefix: (null)
-EOF
-	test_repo 31 "$here/31/.git" "$here/31/wt"
-'
-
-test_expect_success '#31: GIT_DIR(rel), GIT_WORK_TREE=wt in subdir' '
-	cat >31/sub/sub/expected <<EOF &&
-setup: git_dir: $here/31.git
-setup: worktree: $here/31/wt
-setup: cwd: $here/31/sub/sub
-setup: prefix: (null)
-EOF
-	test_repo 31/sub/sub ../../.git "$here/31/wt"
-'
-
-test_expect_success '#31: GIT_DIR(rel), GIT_WORK_TREE=wt(rel) in subdir' '
-	cat >31/sub/sub/expected <<EOF &&
-setup: git_dir: $here/31.git
-setup: worktree: $here/31/wt
-setup: cwd: $here/31/sub/sub
-setup: prefix: (null)
-EOF
-	test_repo 31/sub/sub ../../.git ../../wt
-'
-
-test_expect_success '#31: GIT_DIR, GIT_WORK_TREE=wt(rel) in subdir' '
-	cat >31/sub/sub/expected <<EOF &&
-setup: git_dir: $here/31.git
-setup: worktree: $here/31/wt
-setup: cwd: $here/31/sub/sub
-setup: prefix: (null)
-EOF
-	test_repo 31/sub/sub "$here/31/.git" ../../wt
-'
-
-test_expect_success '#31: GIT_DIR, GIT_WORK_TREE=wt in subdir' '
-	cat >31/sub/sub/expected <<EOF &&
-setup: git_dir: $here/31.git
-setup: worktree: $here/31/wt
-setup: cwd: $here/31/sub/sub
-setup: prefix: (null)
-EOF
-	test_repo 31/sub/sub "$here/31/.git" "$here/31/wt"
-'
-
-test_expect_success '#31: GIT_DIR(rel), GIT_WORK_TREE=.. at root' '
-	cat >31/expected <<EOF &&
-setup: git_dir: $here/31.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 31/
-EOF
-	test_repo 31 .git "$here"
-'
-
-test_expect_success '#31: GIT_DIR(rel), GIT_WORK_TREE=..(rel) at root' '
-	cat >31/expected <<EOF &&
-setup: git_dir: $here/31.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 31/
-EOF
-	test_repo 31 .git ..
-'
-
-test_expect_success '#31: GIT_DIR, GIT_WORK_TREE=..(rel) at root' '
-	cat >31/expected <<EOF &&
-setup: git_dir: $here/31.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 31/
-EOF
-	test_repo 31 "$here/31/.git" ..
-'
-
-test_expect_success '#31: GIT_DIR, GIT_WORK_TREE=.. at root' '
-	cat >31/expected <<EOF &&
-setup: git_dir: $here/31.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 31/
-EOF
-	test_repo 31 "$here/31/.git" "$here"
-'
-
-test_expect_success '#31: GIT_DIR(rel), GIT_WORK_TREE=.. in subdir' '
-	cat >31/sub/sub/expected <<EOF &&
-setup: git_dir: $here/31.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 31/sub/sub/
-EOF
-	test_repo 31/sub/sub ../../.git "$here"
-'
-
-test_expect_success '#31: GIT_DIR(rel), GIT_WORK_TREE=..(rel) in subdir' '
-	cat >31/sub/sub/expected <<EOF &&
-setup: git_dir: $here/31.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 31/sub/sub/
-EOF
-	test_repo 31/sub/sub ../../.git ../../..
-'
-
-test_expect_success '#31: GIT_DIR, GIT_WORK_TREE=..(rel) in subdir' '
-	cat >31/sub/sub/expected <<EOF &&
-setup: git_dir: $here/31.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 31/sub/sub/
-EOF
-	test_repo 31/sub/sub "$here/31/.git" ../../../
-'
-
-test_expect_success '#31: GIT_DIR, GIT_WORK_TREE=.. in subdir' '
-	cat >31/sub/sub/expected <<EOF &&
-setup: git_dir: $here/31.git
-setup: worktree: $here
-setup: cwd: $here
-setup: prefix: 31/sub/sub/
-EOF
-	test_repo 31/sub/sub "$here/31/.git" "$here"
+	setup_repo 31 non-existent gitfile true &&
+	mkdir -p 31/sub/sub 31/wt/sub
 '
+run_wt_tests 31 gitfile
 
 test_done