format-patch: inform user that patch-id generation is unstable

diff --git a/t/t0000-basic.sh b/t/t0000-basic.sh
index b6566003dd8704503305314767f84d516c170f7a..c03054c538a0f9220cb268ed4fa24ae963d06e84 100755 (executable)
--- a/t/t0000-basic.sh
+++ b/t/t0000-basic.sh
@@ -825,6 +825,24 @@ test_expect_success 'tests clean up even on failures' "
        EOF
 "
 
+test_expect_success 'test_atexit is run' "
+       test_must_fail run_sub_test_lib_test \
+               atexit-cleanup 'Run atexit commands' -i <<-\\EOF &&
+       test_expect_success 'tests clean up even after a failure' '
+               > ../../clean-atexit &&
+               test_atexit rm ../../clean-atexit &&
+               > ../../also-clean-atexit &&
+               test_atexit rm ../../also-clean-atexit &&
+               > ../../dont-clean-atexit &&
+               (exit 1)
+       '
+       test_done
+       EOF
+       test_path_is_file dont-clean-atexit &&
+       test_path_is_missing clean-atexit &&
+       test_path_is_missing also-clean-atexit
+"
+
 test_expect_success 'test_oid setup' '
        test_oid_init
 '