mingw: add tests for the hidden attribute on the git directory

With msysGit the .git directory is supposed to be hidden, unless it is
a bare git repository. Test this.

Signed-off-by: Pat Thoyts <patthoyts@users.sourceforge.net>

t/t0001-init.sh

@@ -324,4 +324,32 @@ test_expect_success 'init prefers command line to GIT_DIR' '
 	! test -d otherdir/refs
 '
 
+# Tests for the hidden file attribute on windows
+is_hidden () {
+	test "1" -eq "$(echo puts [file attributes $1 -hidden]|tclsh)"
+}
+
+test_expect_success MINGW 'plain hidden' '
+	rm -rf newdir &&
+	(
+		unset GIT_DIR GIT_WORK_TREE
+		mkdir newdir &&
+		cd newdir &&
+		git init &&
+		is_hidden .git
+	) &&
+	check_config newdir/.git false unset
+'
+
+test_expect_success MINGW 'plain bare not hidden' '
+	rm -rf newdir
+	(
+		unset GIT_DIR GIT_WORK_TREE GIT_CONFIG
+		mkdir newdir &&
+		cd newdir &&
+		git --bare init
+	) &&
+	! is_hidden newdir
+'
+
 test_done

t/test-lib.sh

@@ -872,6 +872,7 @@ case $(uname -s) in
 	# no POSIX permissions
 	# backslashes in pathspec are converted to '/'
 	# exec does not inherit the PID
+        test_set_prereq MINGW
 	;;
 *)
 	test_set_prereq POSIXPERM