Prevent diff machinery from examining assume-unchanged entries on worktree

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/t/t4039-diff-assume-unchanged.sh b/t/t4039-diff-assume-unchanged.sh
new file mode 100755
index 0000000000..9d9498bd95
--- /dev/null
+++ b/t/t4039-diff-assume-unchanged.sh
@@ -0,0 +1,31 @@
+#!/bin/sh
+
+test_description='diff with assume-unchanged entries'
+
+. ./test-lib.sh
+
+# external diff has been tested in t4020-diff-external.sh
+
+test_expect_success 'setup' '
+	echo zero > zero &&
+	git add zero &&
+	git commit -m zero &&
+	echo one > one &&
+	echo two > two &&
+	git add one two &&
+	git commit -m onetwo &&
+	git update-index --assume-unchanged one &&
+	echo borked >> one &&
+	test "$(git ls-files -v one)" = "h one"
+'
+
+test_expect_success 'diff-index does not examine assume-unchanged entries' '
+	git diff-index HEAD^ -- one | grep -q 5626abf0f72e58d7a153368ba57db4c673c0e171
+'
+
+test_expect_success 'diff-files does not examine assume-unchanged entries' '
+	rm one &&
+	test -z "$(git diff-files -- one)"
+'
+
+test_done