public async stt::Task GetDefaultBranchAsync()
        {
            moq::Mock <CatalogService.CatalogServiceClient> mockGrpcClient = new moq::Mock <CatalogService.CatalogServiceClient>(moq::MockBehavior.Strict);
            GetDefaultBranchRequest request = new GetDefaultBranchRequest
            {
                CatalogAsCatalogName = CatalogName.FromProjectLocationCatalog("[PROJECT]", "[LOCATION]", "[CATALOG]"),
            };
            GetDefaultBranchResponse expectedResponse = new GetDefaultBranchResponse
            {
                BranchAsBranchName = BranchName.FromProjectLocationCatalogBranch("[PROJECT]", "[LOCATION]", "[CATALOG]", "[BRANCH]"),
                SetTime            = new wkt::Timestamp(),
                Note = "noteca53d6aa",
            };

            mockGrpcClient.Setup(x => x.GetDefaultBranchAsync(request, moq::It.IsAny <grpccore::CallOptions>())).Returns(new grpccore::AsyncUnaryCall <GetDefaultBranchResponse>(stt::Task.FromResult(expectedResponse), null, null, null, null));
            CatalogServiceClient     client = new CatalogServiceClientImpl(mockGrpcClient.Object, null);
            GetDefaultBranchResponse responseCallSettings = await client.GetDefaultBranchAsync(request.Catalog, gaxgrpc::CallSettings.FromCancellationToken(st::CancellationToken.None));

            xunit::Assert.Same(expectedResponse, responseCallSettings);
            GetDefaultBranchResponse responseCancellationToken = await client.GetDefaultBranchAsync(request.Catalog, st::CancellationToken.None);

            xunit::Assert.Same(expectedResponse, responseCancellationToken);
            mockGrpcClient.VerifyAll();
        }