test-lib: add the '--stress' option to run a test repeatedly under load

diff --git a/t/t4000-diff-format.sh b/t/t4000-diff-format.sh
index 3b9a9ae682f2025b755c23f20937f44d40bb3680..8de36b7d12227a38769f658983363a5ebd52fd68 100755 (executable)
--- a/t/t4000-diff-format.sh
+++ b/t/t4000-diff-format.sh
@@ -71,4 +71,22 @@ test_expect_success 'git diff-files --no-patch as synonym for -s' '
        test_must_be_empty err
 '
 
+test_expect_success 'git diff-files --no-patch --patch shows the patch' '
+       git diff-files --no-patch --patch >actual &&
+       compare_diff_patch expected actual
+'
+
+test_expect_success 'git diff-files --no-patch --patch-with-raw shows the patch and raw data' '
+       git diff-files --no-patch --patch-with-raw >actual &&
+       grep -q "^:100644 100755 .* 0000000000000000000000000000000000000000 M  path0\$" actual &&
+       tail -n +4 actual >actual-patch &&
+       compare_diff_patch expected actual-patch
+'
+
+test_expect_success 'git diff-files --patch --no-patch does not show the patch' '
+       git diff-files --patch --no-patch >actual 2>err &&
+       test_must_be_empty actual &&
+       test_must_be_empty err
+'
+
 test_done