1 files changed, 89 insertions, 0 deletions
diff --git a/t/t4206-log-follow-harder-copies.sh b/t/t4206-log-follow-harder-copies.sh
new file mode 100755
index 0000000000..190c484321
--- /dev/null
+++ b/t/t4206-log-follow-harder-copies.sh
@@ -0,0 +1,89 @@
+#!/bin/sh
+#
+# Copyright (c) 2010 Bo Yang
+#
+
+test_description='Test --follow should always find copies hard in git log.
+
+'
+
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-diff.sh
+
+echo >path0 'Line 1
+Line 2
+Line 3
+'
+
+test_expect_success 'add a file path0 and commit.' '
+	git add path0 &&
+	git commit -m "Add path0"
+'
+
+echo >path0 'New line 1
+New line 2
+New line 3
+'
+test_expect_success 'Change path0.' '
+	git add path0 &&
+	git commit -m "Change path0"
+'
+
+cat <path0 >path1
+test_expect_success 'copy path0 to path1.' '
+	git add path1 &&
+	git commit -m "Copy path1 from path0"
+'
+
+test_expect_success 'find the copy path0 -> path1 harder' '
+	git log --follow --name-status --pretty="format:%s"  path1 > current
+'
+
+cat >expected <<\EOF
+Copy path1 from path0
+C100	path0	path1
+
+Change path0
+M	path0
+
+Add path0
+A	path0
+EOF
+
+test_expect_success 'validate the output.' '
+	compare_diff_patch current expected
+'
+
+test_expect_success 'log --follow -B does not BUG' '
+	git switch --orphan break_and_follow_are_icky_so_use_both &&
+
+	test_seq 1 127 >numbers &&
+	git add numbers &&
+	git commit -m "numbers" &&
+
+	printf "%s\n" A B C D E F G H I J K L M N O Q R S T U V W X Y Z >pool &&
+	echo changed >numbers &&
+	git add pool numbers &&
+	git commit -m "pool" &&
+
+	git log -1 -B --raw --follow -- "p*"
+'
+
+test_expect_success 'log --follow -B does not die or use uninitialized memory' '
+	printf "%s\n" A B C D E F G H I J K L M N O P Q R S T U V W X Y Z >z &&
+	git add z &&
+	git commit -m "Initial" &&
+
+	test_seq 1 130 >z &&
+	echo lame >somefile &&
+	git add z somefile &&
+	git commit -m "Rewrite z, introduce lame somefile" &&
+
+	echo Content >somefile &&
+	git add somefile &&
+	git commit -m "Rewrite somefile" &&
+
+	git log -B --follow somefile
+'
+
+test_done