tests: clean after SANITY tests

Some of our tests try to make sure Git behaves sensibly in a
read-only directory, by dropping 'w' permission bit before doing a
test and then restoring it after it is done.  The latter is needed
for the test framework to clean after itself without leaving a
leftover directory that cannot be removed.

Ancient parts of tests however arrange the above with

	chmod a-w . &&
	... do the test ...
	status=$?
	chmod 775 .
	(exit $status)

which obviously would not work if the test somehow dies before it
has the chance to do "chmod 775".  Rewrite them by following a more
robust pattern recently written tests use, which is

	test_when_finished "chmod 775 ." &&
	chmod a-w . &&
	... do the test ...

Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 2 insertions, 4 deletions

diff --git a/t/t1004-read-tree-m-u-wf.sh b/t/t1004-read-tree-m-u-wf.sh
index c7ce5d8..826cd32 100755
--- a/t/t1004-read-tree-m-u-wf.sh
+++ b/t/t1004-read-tree-m-u-wf.sh
@@ -179,6 +179,8 @@ test_expect_success 'funny symlink in work tree' '
 
 test_expect_success SANITY 'funny symlink in work tree, un-unlink-able' '
 
+	test_when_finished "chmod u+w a 2>/dev/null; rm -fr a b" &&
+
 	rm -fr a b &&
 	git reset --hard &&
 
@@ -188,10 +190,6 @@ test_expect_success SANITY 'funny symlink in work tree, un-unlink-able' '
 
 '
 
-# clean-up from the above test
-chmod a+w a 2>/dev/null
-rm -fr a b
-
 test_expect_success 'D/F setup' '
 
 	git reset --hard &&