1 files changed, 98 insertions, 0 deletions
diff --git a/t/t4127-apply-same-fn.sh b/t/t4127-apply-same-fn.sh
new file mode 100755
index 0000000..aa5cfae
--- /dev/null
+++ b/t/t4127-apply-same-fn.sh
@@ -0,0 +1,98 @@
+#!/bin/sh
+
+test_description='apply same filename'
+
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+modify () {
+	sed -e "$1" < "$2" > "$2".x &&
+	mv "$2".x "$2"
+}
+
+test_expect_success setup '
+	test_write_lines a b c d e f g h i j k l m >same_fn &&
+	cp same_fn other_fn &&
+	git add same_fn other_fn &&
+	git commit -m initial
+'
+test_expect_success 'apply same filename with independent changes' '
+	modify "s/^d/z/" same_fn &&
+	git diff > patch0 &&
+	git add same_fn &&
+	modify "s/^i/y/" same_fn &&
+	git diff >> patch0 &&
+	cp same_fn same_fn2 &&
+	git reset --hard &&
+	git apply patch0 &&
+	test_cmp same_fn same_fn2
+'
+
+test_expect_success 'apply same filename with overlapping changes' '
+	git reset --hard &&
+
+	# Store same_fn so that we can check apply -R in next test
+	cp same_fn same_fn1 &&
+
+	modify "s/^d/z/" same_fn &&
+	git diff > patch0 &&
+	git add same_fn &&
+	modify "s/^e/y/" same_fn &&
+	git diff >> patch0 &&
+	cp same_fn same_fn2 &&
+	git reset --hard &&
+	git apply patch0 &&
+	test_cmp same_fn same_fn2
+'
+
+test_expect_success 'apply same filename with overlapping changes, in reverse' '
+	git apply -R patch0 &&
+	test_cmp same_fn same_fn1
+'
+
+test_expect_success 'apply same new filename after rename' '
+	git reset --hard &&
+	git mv same_fn new_fn &&
+	modify "s/^d/z/" new_fn &&
+	git add new_fn &&
+	git diff -M --cached > patch1 &&
+	modify "s/^e/y/" new_fn &&
+	git diff >> patch1 &&
+	cp new_fn new_fn2 &&
+	git reset --hard &&
+	git apply --index patch1 &&
+	test_cmp new_fn new_fn2
+'
+
+test_expect_success 'apply same old filename after rename -- should fail.' '
+	git reset --hard &&
+	git mv same_fn new_fn &&
+	modify "s/^d/z/" new_fn &&
+	git add new_fn &&
+	git diff -M --cached > patch1 &&
+	git mv new_fn same_fn &&
+	modify "s/^e/y/" same_fn &&
+	git diff >> patch1 &&
+	git reset --hard &&
+	test_must_fail git apply patch1
+'
+
+test_expect_success 'apply A->B (rename), C->A (rename), A->A -- should pass.' '
+	git reset --hard &&
+	git mv same_fn new_fn &&
+	modify "s/^d/z/" new_fn &&
+	git add new_fn &&
+	git diff -M --cached > patch1 &&
+	git commit -m "a rename" &&
+	git mv other_fn same_fn &&
+	modify "s/^e/y/" same_fn &&
+	git add same_fn &&
+	git diff -M --cached >> patch1 &&
+	modify "s/^g/x/" same_fn &&
+	git diff >> patch1 &&
+	git reset --hard HEAD^ &&
+	git apply patch1
+'
+
+test_done