From f1997376ee007d152fcde9da16a376bd247ca888 Mon Sep 17 00:00:00 2001
From: pkositsyn <pkositsyn@ozon.ru>
Date: Mon, 22 Feb 2021 01:35:45 +0300
Subject: [PATCH] Add test to make sure passed keys are not modified in keylock

---
 keylock/keylock_test.go | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/keylock/keylock_test.go b/keylock/keylock_test.go
index 762a855..4888ac8 100644
--- a/keylock/keylock_test.go
+++ b/keylock/keylock_test.go
@@ -83,6 +83,20 @@ func TestKeyLock_DeadlockFree(t *testing.T) {
 	wg.Wait()
 }
 
+func TestKeyLock_NoMutates(t *testing.T) {
+	defer goleak.VerifyNone(t)
+	l := keylock.New()
+
+	keys := []string{"b", "c", "a"}
+	passedKeys := make([]string, len(keys))
+	copy(passedKeys, keys)
+
+	_, unlock := l.LockKeys(passedKeys, nil)
+	unlock()
+
+	require.Equal(t, keys, passedKeys, "passed keys shouldn't be mutated")
+}
+
 func TestKeyLock_SingleKeyStress(t *testing.T) {
 	const (
 		N = 1000