public async Task TestRestSample()
{
// create mocks
var logger = new Mock <ILogger <QueryService> >();
var tfsClient = new Mock <ITfsClient>();
var witHttpClient = new Mock <WorkItemTrackingHttpClient>(new Uri("http://dummy.url"), new VssCredentials());
// inject behaviors in mocks
witHttpClient.Setup(x => x.GetQueriesAsync(It.IsAny <string>(), null, It.IsAny <int?>(), null, It.IsAny <object>(), It.IsAny <CancellationToken>()))
.ReturnsAsync(GetNominalTfsQueryHierarchy());
witHttpClient.Setup(x => x.QueryByIdAsync(It.IsAny <Guid>(), null, It.IsAny <CancellationToken>()))
.ReturnsAsync(GetNominalTfsQueryResult());
witHttpClient.Setup(x => x.GetWorkItemsAsync(It.IsAny <IEnumerable <int> >(), null, It.IsAny <DateTime?>(), It.IsAny <WorkItemExpand?>(), null, It.IsAny <CancellationToken>()))
.ReturnsAsync(GetNominalWorkItemList());
tfsClient.Setup(x => x.WorkItemTrackingHttpClient)
.Returns(() => witHttpClient.Object);
// do the actual test
var service = new QueryService(logger.Object, tfsClient.Object);
var output = await service.DoRestSample("dummyProject");
// verify the test execution
Assert.True(output != null);
Assert.Equal(5, output.Count);
}