任务待定的最小起订量 [英] Moq with Task await

问题描述

由于我已将WCF方法转换为Async，因此单元测试失败，并且我无法找出正确的语法来使它们正常工作.

Since I have converted my WCF methods to Async, my unit tests have failed, and I can't figure out the correct syntax to get them to work.

即时代理类

 public interface IClientProxy
{
     Task DoSomething(CredentialDataList credentialData, string store);
}

服务等级

  public class CredentialSync : ICredentialSync
{
    private ICredentialRepository _repository;

    private IClientProxy _client;

    public CredentialSync()
    {
        this._repository = new CredentialRepository();
        this._client = new ClientProxy();
    }

    public CredentialSync(ICredentialRepository repository, IClientProxy client)
    {
        this._repository = repository;
        this._client = client;
    }

   public async Task Synchronise(string payrollNumber)
    {
        try
        {
            if (string.IsNullOrEmpty(payrollNumber))
            {
                .... some code
              }
            else
            {
                CredentialDataList credentialData = new CredentialDataList();
                List<CredentialData> credentialList = new List<CredentialData>();

                // fetch the record from the database
                List<GetCredentialData_Result> data = this._repository.GetCredentialData(payrollNumber);
                var pinData = this._repository.GetCredentialPinData(payrollNumber);

                // get the stores for this employee
                var storeList = data.Where(a => a.StoreNumber != null)
                    .GroupBy(a => a.StoreNumber)
                    .Select(x => new Store { StoreNumber = x.Key.ToString() }).ToArray();

                var credential = this.ExtractCredentialData(data, pinData, payrollNumber);

                credentialList.Add(credential);
                credentialData.CredentialList = credentialList;

                foreach (var store in storeList)
                {       
                  //this line causes an Object reference not set to an instance of an object error
                   await  _client.DoSomething(credentialData, store.StoreNumber);

                }
            }
        }
        catch (Exception ex)
        {
            throw new FaultException<Exception>(ex);
        }
    }

测试类

 /// </summary>
[TestClass]
public class SynchTest
{

    private Mock<ICredentialRepository> _mockRepository;
    private Mock<IClientProxy> _mockService;

    [TestInitialize]
    public void Setup()
    {
       ... some setups for repository which work fine
    }

[TestMethod]      
    public async Task SynchroniseData_WithOneEmployee_CallsReplicateService()
    {
        this._mockService = new Mock<IClientProxy>();
        this._mockService.Setup(x=>x.DoSomething(It.IsAny<CredentialDataList>(), It.IsAny<string>()));
        // arrange
        string payrollNumber = "1";
        CredentialSync service = new CredentialSync(this._mockRepository.Object, this._mockService.Object);

        // act
        await service.Synchronise(payrollNumber);

        // assert                 
        this._mockService.VerifyAll();
    }

错误是在调用ClientProxy.DoSomething时出现的:

The error is when ClientProxy.DoSomething is called:

对象引用未设置为对象的实例

Object reference not set to an instance of an object

参数都很好.

如果我将ClientProxy.DoSomething方法转换为同步方法 (public void DoSomething(...))代码可以正常工作，但是我确实需要异步调用它

If I convert my ClientProxy.DoSomething method to a synchronous method (public void DoSomething(...) )the code works fine, but I do need this to be called asynchronously

推荐答案

DoSomething返回null而不是返回Task，因此等待时会得到异常.您需要在构建模拟时指定它应返回Task.

DoSomething returns null instead of returning a Task, and so you get an exception when awaiting it. You need to specify when building the mock that it should return a Task.

在这种情况下，您似乎可以简单地使用Task.FromResult返回一个已完成的任务，因此模拟设置应如下所示:

In this case it seems that you can simply return an already completed task using Task.FromResult so the mock setup should look like this:

this._mockService.Setup(...).Returns(Task.FromResult(false));

---

从.Net(4.6)的下一版本开始，您可以像这样使用Task.CompletedTask:

this._mockService.Setup(...).Returns(Task.CompletedTask);

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