1 files changed, 155 insertions, 0 deletions
diff --git a/t/t6409-merge-subtree.sh b/t/t6409-merge-subtree.sh
new file mode 100755
index 0000000000..ba7890ec52
--- /dev/null
+++ b/t/t6409-merge-subtree.sh
@@ -0,0 +1,155 @@
+#!/bin/sh
+
+test_description='subtree merge strategy'
+
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+. ./test-lib.sh
+
+test_expect_success setup '
+
+	s="1 2 3 4 5 6 7 8" &&
+	for i in $s; do echo $i; done >hello &&
+	git add hello &&
+	git commit -m initial &&
+	git checkout -b side &&
+	echo >>hello world &&
+	git add hello &&
+	git commit -m second &&
+	git checkout main &&
+	for i in mundo $s; do echo $i; done >hello &&
+	git add hello &&
+	git commit -m main
+
+'
+
+test_expect_success 'subtree available and works like recursive' '
+
+	git merge -s subtree side &&
+	for i in mundo $s world; do echo $i; done >expect &&
+	test_cmp expect hello
+
+'
+
+test_expect_success 'setup branch sub' '
+	git checkout --orphan sub &&
+	git rm -rf . &&
+	test_commit foo
+'
+
+test_expect_success 'setup topic branch' '
+	git checkout -b topic main &&
+	git merge -s ours --no-commit --allow-unrelated-histories sub &&
+	git read-tree --prefix=dir/ -u sub &&
+	git commit -m "initial merge of sub into topic" &&
+	test_path_is_file dir/foo.t &&
+	test_path_is_file hello
+'
+
+test_expect_success 'update branch sub' '
+	git checkout sub &&
+	test_commit bar
+'
+
+test_expect_success 'update topic branch' '
+	git checkout topic &&
+	git merge -s subtree sub -m "second merge of sub into topic" &&
+	test_path_is_file dir/bar.t &&
+	test_path_is_file dir/foo.t &&
+	test_path_is_file hello
+'
+
+test_expect_success 'setup' '
+	mkdir git-gui &&
+	cd git-gui &&
+	git init &&
+	echo git-gui > git-gui.sh &&
+	o1=$(git hash-object git-gui.sh) &&
+	git add git-gui.sh &&
+	git commit -m "initial git-gui" &&
+	cd .. &&
+	mkdir git &&
+	cd git &&
+	git init &&
+	echo git >git.c &&
+	o2=$(git hash-object git.c) &&
+	git add git.c &&
+	git commit -m "initial git"
+'
+
+test_expect_success 'initial merge' '
+	git remote add -f gui ../git-gui &&
+	git merge -s ours --no-commit --allow-unrelated-histories gui/main &&
+	git read-tree --prefix=git-gui/ -u gui/main &&
+	git commit -m "Merge git-gui as our subdirectory" &&
+	git checkout -b work &&
+	git ls-files -s >actual &&
+	(
+		echo "100644 $o1 0	git-gui/git-gui.sh" &&
+		echo "100644 $o2 0	git.c"
+	) >expected &&
+	test_cmp expected actual
+'
+
+test_expect_success 'merge update' '
+	cd ../git-gui &&
+	echo git-gui2 > git-gui.sh &&
+	o3=$(git hash-object git-gui.sh) &&
+	git add git-gui.sh &&
+	git checkout -b topic_2 &&
+	git commit -m "update git-gui" &&
+	cd ../git &&
+	git pull --no-rebase -s subtree gui topic_2 &&
+	git ls-files -s >actual &&
+	(
+		echo "100644 $o3 0	git-gui/git-gui.sh" &&
+		echo "100644 $o2 0	git.c"
+	) >expected &&
+	test_cmp expected actual
+'
+
+test_expect_success 'initial ambiguous subtree' '
+	cd ../git &&
+	git reset --hard main &&
+	git checkout -b topic_2 &&
+	git merge -s ours --no-commit gui/main &&
+	git read-tree --prefix=git-gui2/ -u gui/main &&
+	git commit -m "Merge git-gui2 as our subdirectory" &&
+	git checkout -b work2 &&
+	git ls-files -s >actual &&
+	(
+		echo "100644 $o1 0	git-gui/git-gui.sh" &&
+		echo "100644 $o1 0	git-gui2/git-gui.sh" &&
+		echo "100644 $o2 0	git.c"
+	) >expected &&
+	test_cmp expected actual
+'
+
+test_expect_success 'merge using explicit' '
+	cd ../git &&
+	git reset --hard topic_2 &&
+	git pull --no-rebase -Xsubtree=git-gui gui topic_2 &&
+	git ls-files -s >actual &&
+	(
+		echo "100644 $o3 0	git-gui/git-gui.sh" &&
+		echo "100644 $o1 0	git-gui2/git-gui.sh" &&
+		echo "100644 $o2 0	git.c"
+	) >expected &&
+	test_cmp expected actual
+'
+
+test_expect_success 'merge2 using explicit' '
+	cd ../git &&
+	git reset --hard topic_2 &&
+	git pull --no-rebase -Xsubtree=git-gui2 gui topic_2 &&
+	git ls-files -s >actual &&
+	(
+		echo "100644 $o1 0	git-gui/git-gui.sh" &&
+		echo "100644 $o3 0	git-gui2/git-gui.sh" &&
+		echo "100644 $o2 0	git.c"
+	) >expected &&
+	test_cmp expected actual
+'
+
+test_done