1 files changed, 74 insertions, 0 deletions
diff --git a/t/t3419-rebase-patch-id.sh b/t/t3419-rebase-patch-id.sh
new file mode 100755
index 0000000000..295040f2fe
--- /dev/null
+++ b/t/t3419-rebase-patch-id.sh
@@ -0,0 +1,74 @@
+#!/bin/sh
+
+test_description='git rebase - test patch id computation'
+
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+. ./test-lib.sh
+
+scramble () {
+	i=0
+	while read x
+	do
+		if test $i -ne 0
+		then
+			echo "$x"
+		fi
+		i=$((($i+1) % 10))
+	done <"$1" >"$1.new"
+	mv -f "$1.new" "$1"
+}
+
+test_expect_success 'setup' '
+	git commit --allow-empty -m initial &&
+	git tag root
+'
+
+test_expect_success 'setup: 500 lines' '
+	rm -f .gitattributes &&
+	git checkout -q -f main &&
+	git reset --hard root &&
+	test_seq 500 >file &&
+	git add file &&
+	git commit -q -m initial &&
+	git branch -f other &&
+
+	scramble file &&
+	git add file &&
+	git commit -q -m "change big file" &&
+
+	git checkout -q other &&
+	: >newfile &&
+	git add newfile &&
+	git commit -q -m "add small file" &&
+
+	git cherry-pick main >/dev/null 2>&1
+'
+
+test_expect_success 'setup attributes' '
+	echo "file binary" >.gitattributes
+'
+
+test_expect_success 'detect upstream patch' '
+	git checkout -q main &&
+	scramble file &&
+	git add file &&
+	git commit -q -m "change big file again" &&
+	git checkout -q other^{} &&
+	git rebase main &&
+	git rev-list main...HEAD~ >revs &&
+	test_must_be_empty revs
+'
+
+test_expect_success 'do not drop patch' '
+	git branch -f squashed main &&
+	git checkout -q -f squashed &&
+	git reset -q --soft HEAD~2 &&
+	git commit -q -m squashed &&
+	git checkout -q other^{} &&
+	test_must_fail git rebase squashed &&
+	git rebase --quit
+'
+
+test_done