From a515c55c8fcd2dc1a8f93f4a46ac91b7c40ab6da Mon Sep 17 00:00:00 2001
From: Johannes Schindelin <johannes.schindelin@gmx.de>
Date: Fri, 14 Sep 2018 14:42:13 -0500
Subject: [PATCH] tests: introduce `test_atexit`

When running the p4 daemon or `git daemon`, we want to kill it at the
end of the test script.

So far, we do this "manually".

However, in the next few commits we want to teach the test suite to
optionally re-run scripts with different options, therefore we will have
to have a consistent way to stop daemons.

Let's introduce `test_atexit`, which is loosely modeled after
`test_when_finished` (but has a broader scope: rather than running the
commands after the current test case, run them when the test script
finishes, and also run them when the `--immediate` option is in effect).

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>