diff --git a/lru_cache_test.go b/lru_cache_test.go
index 1d403b2..1a02830 100644
--- a/lru_cache_test.go
+++ b/lru_cache_test.go
@@ -139,6 +139,27 @@ func TestCopyTo_LRU(t *testing.T) {
 func TestKeys_LRU(t *testing.T) {
 	c := NewLRU[string, string](10)
 
+	c.Set("key1", "value1")
+	c.Set("key2", "value2")
+	c.Set("key3", "value3")
+	c.Set("key4", "value4")
+	c.Set("key5", "value5")
+	c.SetWithTimeout("key6", "value6", 1)
+	c.SetWithTimeout("key7", "value7", 1)
+	c.SetWithTimeout("key8", "value8", 1)
+	c.SetWithTimeout("key9", "value9", 1)
+	c.Set("key10", "value10")
+
+	keys := c.Keys()
+
+	if len(keys) != 6 {
+		t.Errorf("Keys failed")
+	}
+}
+
+func TestAllKeys_LRU(t *testing.T) {
+	c := NewLRU[string, string](10)
+
 	c.Set("key1", "value1")
 	c.Set("key2", "value2")
 	c.Set("key3", "value3")