[PATCH v1 1/2] t7615: test how merge behave when there is untracked file

[Jonathan <git.jonathan.bressat@gmail.com>]

when there is untracked file that has the same name than file in the
merged branch git refuse to proceed, even when the file has the same
content

t6436 test a similar thing but not especially with same content file

Signed-off-by: Jonathan <git.jonathan.bressat@gmail.com>
Signed-off-by: COGONI Guillaume <cogoni.guillaume@gmail.com>
---
 t/t7615-merge-untracked.sh | 63 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100755 t/t7615-merge-untracked.sh

diff --git a/t/t7615-merge-untracked.sh b/t/t7615-merge-untracked.sh
new file mode 100755
index 0000000000..053e6b80ee
--- /dev/null
+++ b/t/t7615-merge-untracked.sh
@@ -0,0 +1,63 @@
+#!/bin/sh
+
+test_description='test when merge with untracked file'
+
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+	test_commit "init" README.md "content" &&
+	git checkout -b A
+'
+
+test_expect_success 'fastforward fail when untracked file has the same content' '
+	test_when_finished "git branch -D B && git reset --hard init && git clean --force" &&
+	git checkout -b B &&
+	test_commit --no-tag "tracked" file "content" &&
+	git checkout A &&
+	echo content >file &&
+	test_must_fail git merge B
+'
+
+test_expect_success 'fastforward fail when untracked file has different content' '
+	test_when_finished "git branch -D B && git reset --hard init && git clean --force" &&
+	git checkout -b B &&
+	test_commit --no-tag "tracked" file "content" &&
+	git switch A &&
+	echo other >file &&
+	test_must_fail git merge B
+'
+
+test_expect_success 'normal merge fail when untracked file has the same content' '
+	test_when_finished "git branch -D B && git reset --hard init && git clean --force" &&
+	git checkout -b B &&
+	test_commit --no-tag "tracked" file "content" fileB "content" &&
+	git switch A &&
+	test_commit --no-tag "exA" fileA "content" &&
+	echo content >file &&
+	test_must_fail git merge B
+'
+
+test_expect_success 'normal merge fail when untracked file has different content' '
+	test_when_finished "git branch -D B && git reset --hard init && git clean --force" &&
+	git checkout -b B &&
+	test_commit --no-tag "tracked" file "content" fileB "content" &&
+	git switch A &&
+	test_commit --no-tag "exA" fileA "content" &&
+	echo dif >file &&
+	test_must_fail git merge B
+'
+
+test_expect_success 'merge fail when tracked file modification is unstaged' '
+	test_when_finished "git branch -D B && git reset --hard init && git clean --force" &&
+	test_commit --no-tag "unstaged" file "other" &&
+	git checkout -b B &&
+	test_commit --no-tag "staged" file "content" &&
+	git switch A &&
+	echo content >file &&
+	test_must_fail git merge B
+'
+
+test_done
-- 
2.35.1.7.gc8609858e0.dirty