fix test

Author: roger-zhangg

tests/functional/idempotency/persistence/test_redis_layer.py

@@ -32,7 +32,7 @@ def get_remaining_time_in_millis(self) -> int:
 
 
 class MockRedis:
-    def __init__(self, decode_responses, cache, **kwargs):
+    def __init__(self, decode_responses, cache: dict = None, **kwargs):
         self.cache = cache or {}
         self.expire_dict = {}
         self.decode_responses = decode_responses
@@ -43,6 +43,9 @@ def hset(self, name, mapping):
         self.expire_dict.pop(name, {})
         self.cache[name] = mapping
 
+    def from_url(self, url: str):
+        pass
+
     # not covered by test yet.
     def expire(self, name, time):
         self.expire_dict[name] = t.time() + time