t7508: add tests capturing racy timestamp handling

"git status" fixes racy timestamps regardless of the worktree being
dirty or not. The new test cases capture this behavior.

Signed-off-by: Marc Strapetz <marc.strapetz@syntevo.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t7508-status.sh b/t/t7508-status.sh
index b9efd2613d0f36bab28fe2aa92521f2572024f1a..2b7ef6c41a455423c0c62087a440e51bc4c72486 100755 (executable)
--- a/t/t7508-status.sh
+++ b/t/t7508-status.sh
@@ -1654,4 +1654,26 @@ test_expect_success '--no-optional-locks prevents index update' '
        ! test_is_magic_mtime .git/index
 '
 
+test_expect_success 'racy timestamps will be fixed for clean worktree' '
+       echo content >racy-dirty &&
+       echo content >racy-racy &&
+       git add racy* &&
+       git commit -m "racy test files" &&
+       # let status rewrite the index, if necessary; after that we expect
+       # no more index writes unless caused by racy timestamps; note that
+       # timestamps may already be racy now (depending on previous tests)
+       git status &&
+       test_set_magic_mtime .git/index &&
+       git status &&
+       ! test_is_magic_mtime .git/index
+'
+
+test_expect_success 'racy timestamps will be fixed for dirty worktree' '
+       echo content2 >racy-dirty &&
+       git status &&
+       test_set_magic_mtime .git/index &&
+       git status &&
+       ! test_is_magic_mtime .git/index
+'
+
 test_done