public void ClearDiscoveryCacheShouldEmptyCacheWithEmptyArguments()
        {
            SetupWithCache();
            var response = _responses["authentication"];
            var options  = new DiscoveryOptions();

            for (int i = 0; i < 5; i++)
            {
                _restClient.QueueResponse(response);
                _restClient.QueueResponse(_responses["provider-metadata"]);
                var result = _discovery.CompleteSelectedOperatorDiscovery(_config, REDIRECT_URL, "90" + i, "01");
            }

            _discovery.ClearDiscoveryCacheAsync(null, null);

            Assert.IsTrue(_cache.IsEmpty);
        }