模拟具有链式方法的SDK客户端

Question

我需要进行单元测试 测试1() 如下图所示，还要模仿 msgraph-sdk 创建有http调用的事件。我在嘲笑 请求() 和 AddAsync( ) 方法，但在Act上得到了空值。正确的单元测试方法是什么？创建异步 嘲笑？

public interface IApiClient
{
    Task<Event> CreateAsync(EventItem eventItem);
}

public class ApiClient : IApiClient
{
    private readonly IGraphServiceClient _graphServiceClient;


    public ApiClient(IGraphServiceClient graphServiceClient)
    {
        _graphServiceClient = graphServiceClient;
    }

    public async Task<Event> CreateAsync(EventItem eventItem)
    {
        var item = new Event
        {
            Subject = eventItem.Subject
        };
        return await _graphServiceClient.Users[eventItem.UserInfo.Id].Events
            .Request()
            .AddAsync(item);
    }

}

public class ApiClientTest
{
    private Mock<IGraphServiceClient> _graphServiceClientMock;
    private IApiClient _apiClient;
    private Mock<IUserEventsCollectionRequest> _mockUserEventsCollectionRequest;
    private EventItem _eventItem;

    [SetUp]
    public async System.Threading.Tasks.Task SetupAsync()
    {
        var x = new Microsoft.Graph.Event()
        {
            Subject = "123"
        };

        _graphServiceClientMock = new Mock<IGraphServiceClient>();
        _mockUserEventsCollectionRequest = new Mock<IUserEventsCollectionRequest>();
        _apiClient = new IApiClient(_graphServiceClientMock.Object);

        _graphServiceClientMock.Setup(g => g.Users[_eventItem.UserInfo.Id].Events
                               .Request())
                               .Returns(
        _mockUserEventsCollectionRequest.Setup(g => g.AddAsync(x))
                               .ReturnsAsync(new Event { Id = "asaasaS" });

    }

    [Test]
    public async Task Test1()
    {
        // Act
        var newEvent = await _apiClient.CreateAsync(_eventItem);
        // Assert
        Assert.NotNull(newEvent);
        Assert.AreEqual("asaasaS", newEvent.Id);
    }
}   

我在嘲笑 请求() 和 AddAsync( ) 方法，但在Act上得到了空值。正确的单元测试方法是什么？创建异步 通过模拟？

Answer 1

有很多嘲讽你来测试这个，所以也许你应该问自己是否值得。如果答案是肯定的，那么这里有一个例子，你可以怎么做（我把所有的东西都放到了 Test1 方法，并跳过 [SetUp] 方法，以提高可视性）。)

public class ApiClientTest
{
    [Test]
    public async Task Test1()
    {
        // Arrange
        Event @event = new Event { Subject = "Subject", Id = "123" };
        EventItem eventItem = new EventItem { Subject = @event.Subject, UserInfo = new UserInfo { Id = @event.Id } };

        Mock<IUserEventsCollectionRequest> mockUserEventsCollectionRequest = new Mock<IUserEventsCollectionRequest>();
        mockUserEventsCollectionRequest.Setup(x => x.AddAsync(It.IsAny<Event>())).ReturnsAsync(@event);

        Mock<IUserEventsCollectionRequestBuilder> mockUserEventsCollectionRequestBuilder = new Mock<IUserEventsCollectionRequestBuilder>();
        mockUserEventsCollectionRequestBuilder.Setup(x => x.Request()).Returns(mockUserEventsCollectionRequest.Object);

        Mock<IUserRequestBuilder> userRequestBuilder = new Mock<IUserRequestBuilder>();
        userRequestBuilder.Setup(x => x.Events).Returns(mockUserEventsCollectionRequestBuilder.Object);

        Mock<IGraphServiceClient> graphServiceClient = new Mock<IGraphServiceClient>();
        graphServiceClient.Setup(x => x.Users[It.IsAny<string>()]).Returns(userRequestBuilder.Object);

        IApiClient apiClient = new ApiClient(graphServiceClient.Object);

        // Act
        Event newEvent = await apiClient.CreateAsync(eventItem);

        // Assert
        Assert.NotNull(newEvent);
        Assert.AreEqual(@event.Id, newEvent.Id);
        Assert.AreEqual(@event.Subject, newEvent.Subject);
    }
}