public void RefreshSegmentNullChangesFetcherResponseShouldNotUpdateCache()
{
//Arrange
var gates = new InMemoryReadinessGatesCache();
var apiClient = new Mock <ISegmentSdkApiClient>();
apiClient
.Setup(x => x.FetchSegmentChanges(It.IsAny <string>(), It.IsAny <long>()))
.Throws(new Exception());
var apiFetcher = new ApiSegmentChangeFetcher(apiClient.Object);
var segments = new ConcurrentDictionary <string, Segment>();
var cache = new InMemorySegmentCache(segments);
var segmentFetcher = new SelfRefreshingSegment("payed", apiFetcher, gates, cache);
//Act
segmentFetcher.RefreshSegment();
//Assert
Assert.AreEqual(0, segments.Count);
}