[PATCH] t4013: add expected failure for "log --patch --no-patch"

[Sergey Organov <sorganov@gmail.com>]

--patch followed by --no-patch is to be a no-op according to the "git
log" manual page. In reality this sequence breaks --raw output
though (and who knows what else?)

Add a test_expected_failure case for the issue.

Signed-off-by: Sergey Organov <sorganov@gmail.com>
---
 t/t4013-diff-various.sh | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/t/t4013-diff-various.sh b/t/t4013-diff-various.sh
index 5de1d190759f..f876b0cc8ec3 100755
--- a/t/t4013-diff-various.sh
+++ b/t/t4013-diff-various.sh
@@ -457,6 +457,17 @@ diff-tree --stat --compact-summary initial mode
 diff-tree -R --stat --compact-summary initial mode
 EOF
 
+# This should succeed as --patch followed by --no-patch sequence is to
+# be a no-op according to the manual page. In reality it breaks --raw
+# though. Needs to be fixed.
+test_expect_failure '--no-patch cancels --patch only' '
+	git log --raw master >result &&
+	process_diffs result >expected &&
+	git log --patch --no-patch --raw >result &&
+	process_diffs result >actual &&
+	test_cmp expected actual
+'
+
 test_expect_success 'log -m matches pure log' '
 	git log master >result &&
 	process_diffs result >expected &&
-- 
2.25.1