[RFC PATCHv3 2/4] t/am: add test for stgit patch format

[Chris Packham <judge.packham@gmail.com>]

This adds a tests which exercise the detection of the stgit format.
There is a current know breakage in that the code that deals with stgit
in split_patches can't handle reading from stdin.

Signed-off-by: Chris Packham <judge.packham@gmail.com>
---
 t/t4150-am.sh | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/t/t4150-am.sh b/t/t4150-am.sh
index 5edb79a..dbe3475 100755
--- a/t/t4150-am.sh
+++ b/t/t4150-am.sh
@@ -103,6 +103,15 @@ test_expect_success setup '
 		echo "X-Fake-Field: Line Three" &&
 		git format-patch --stdout first | sed -e "1d"
 	} > patch1-ws.eml &&
+	{
+		echo "From: $GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL>" &&
+		echo &&
+		cat msg &&
+		echo &&
+		echo "Signed-off-by: $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL>" &&
+		echo "---" &&
+		git diff-tree --stat -p second | sed -e "1d"
+	} > patch1-stgit.eml &&
 
 	sed -n -e "3,\$p" msg >file &&
 	git add file &&
@@ -186,6 +195,24 @@ test_expect_success 'am applies patch e-mail with preceding whitespace' '
 	test "$(git rev-parse second^)" = "$(git rev-parse HEAD^)"
 '
 
+test_expect_success 'am applies patch generated by stgit' '
+	rm -fr .git/rebase-apply &&
+	git reset --hard &&
+	git checkout first &&
+	git am patch1-stgit.eml &&
+	test_path_is_missing .git/rebase-apply &&
+	git diff --exit-code second
+'
+
+test_expect_failure 'am applies patch using --patch-format=stgit' '
+	rm -fr .git/rebase-apply &&
+	git reset --hard &&
+	git checkout first &&
+	git am --patch-format=stgit <patch1-stgit.eml &&
+	test_path_is_missing .git/rebase-apply &&
+	git diff --exit-code second
+'
+
 test_expect_success 'setup: new author and committer' '
 	GIT_AUTHOR_NAME="Another Thor" &&
 	GIT_AUTHOR_EMAIL="a.thor@example.com" &&
-- 
2.1.0.64.gc343089