Merge branch 'jk/format-patch-change-format-for-empty-commits'

"git format-patch" learned to write a log-message only output file
for empty commits.

* jk/format-patch-change-format-for-empty-commits:
  format-patch: output header for empty commits

1 files changed, 10 insertions, 0 deletions

diff --git a/t/t4014-format-patch.sh b/t/t4014-format-patch.sh
index f3313b8c58..ffc7c60680 100755
--- a/t/t4014-format-patch.sh
+++ b/t/t4014-format-patch.sh
@@ -59,6 +59,10 @@ test_expect_success setup '
 	test_tick &&
 	git commit -m "patchid 3" &&
 
+	git checkout -b empty main &&
+	test_tick &&
+	git commit --allow-empty -m "empty commit" &&
+
 	git checkout main
 '
 
@@ -128,6 +132,12 @@ test_expect_success 'replay did not screw up the log message' '
 	grep "^Side .* with .* backslash-n" actual
 '
 
+test_expect_success 'format-patch empty commit' '
+	git format-patch --stdout main..empty >empty &&
+	grep "^From " empty >from &&
+	test_line_count = 1 from
+'
+
 test_expect_success 'extra headers' '
 	git config format.headers "To: R E Cipient <rcipient@example.com>
 " &&