private static CosmosContainerCore GetMockedContainer(string containerName = null)
        {
            Mock <CosmosContainerCore> mockedContainer = MockCosmosUtil.CreateMockContainer(containerName: containerName);

            mockedContainer.Setup(c => c.ClientContext).Returns(ChangeFeedEstimatorCoreTests.GetMockedClientContext());
            return(mockedContainer.Object);
        }