如何模拟由 Visual Studio 自动生成的 SOAP 客户端？

Question

我有一个自动生成的 SOAP 客户端。它是由 Visual Studio 向导生成的（添加连接的服务 -> Microsoft WCF Web 服务参考提供程序）。我想模拟那个客户端，所以当一个方法被调用时，一个预定义的结果将以 SOAP 响应的格式返回。不幸的是，我无法让它工作——我的结果要么为空（而不是在 .Returns 中定义），要么出现异常。

我正在尝试在我的设计中应用干净的架构。所以这个 SOAP 客户端登陆了我的基础设施层，在那里我为它创建了一个存储库。此存储库创建 DTO，因此可以将它们分派给我的持久性。存储库通过依赖注入接收 SOAP 客户端。我还想对存储库进行测试，只是为了验证 DTO 生成是否正确。所以，我想模拟这个 SOAP 服务，这样我就可以将它提供给存储库并测试返回的 DTO。

自动生成的界面：

    public interface ApplicationSoap
    {
        [System.ServiceModel.OperationContractAttribute(Action = "http://Application/GetAppVersion", ReplyAction = "*")]
        Task<ExtApp.GetAppVersionResponse> GetAppVersionAsync(ExtApp.GetAppVersionRequest request);
    }

和自动生成的客户端类：

    [System.Diagnostics.DebuggerStepThroughAttribute()]
    [System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.Tools.ServiceModel.Svcutil", "2.0.1-preview-30514-0828")]
    public partial class ApplicationSoapClient : System.ServiceModel.ClientBase<ExtApp.ApplicationSoap>, ExtApp.ApplicationSoap
    {

        static partial void ConfigureEndpoint(System.ServiceModel.Description.ServiceEndpoint serviceEndpoint, System.ServiceModel.Description.ClientCredentials clientCredentials);

        [System.ComponentModel.EditorBrowsableAttribute(System.ComponentModel.EditorBrowsableState.Advanced)]
        System.Threading.Tasks.Task<ExtApp.GetAppVersionResponse> ExtApp.ApplicationSoap.GetAppVersionAsync(ExtApp.GetAppVersionRequest request)
        {
            return base.Channel.GetAppVersionAsync(request);
        }

        public System.Threading.Tasks.Task<ExtApp.GetAppVersionResponse> GetAppVersionAsync(int appVer)
        {
            ExtApp.GetAppVersionRequest inValue = new ExtApp.GetAppVersionRequest();
            inValue.Body = new ExtApp.GetAppVersionRequestBody();
            inValue.Body.appVer = appVer;
            return ((ExtApp.ApplicationSoap)(this)).GetAppVersionAsync(inValue);
        }
    }

我想模拟 ApplicationSoapClient 和方法 GetApplicationVersionAsync。 经过不同的尝试后，我在我的测试课中得到了以下结果：

private ExtApp.AppVersion[] _response =
    new ExtApp.AppVersion[]
        {
         new ExtApp.AppVersion
             {
              VersionNumber = 1,
              StartDate = DateTime.Parse("2010-01-01"),
              EndDate = DateTime.Parse("2015-12-31")
             },
        };

private Mock<ExtApp.ApplicationSoap> _client = new Mock<ExtApp.ApplicationSoap>();

public TestClass() 
{
    var body = new ExtApp.GetAppVersionRequestBody(It.IsAny<int>());
    var request = new ExtApp.GetAppVersionRequestRequest(body);
    _client
           .Setup(s => s.GetAppVersionAsync(request))                
           .Returns(
               Task.FromResult(
                   new ExtApp.GetAppVersionResponse(
                       new ExtApp.GetAppVersionResponseBody(_response)))
            );
}

[Fact]
public void TestAppVersionDownload()
{
    var request = new ExtApp.GetAppVersionRequest(
                      new ExtApp.GetAppVersionRequestBody(1));
    var result = _clientSoap.Object.GetAppVersionAsync(request)
                      .Result; //returns null instead of defined in Returns section
    Assert.True(result.Body.GetAppVersionResult.Length == 2);
}

它运行，但调用的结果是null。我期望取回具有非空 Body 属性的对象，其中包含数组。我正在寻找如何使这件事发挥作用的建议。

Answer 1

您的 SOAP 客户端合同是：

public interface ApplicationSoap
{
    [System.ServiceModel.OperationContractAttribute(Action = "http://Application/GetAppVersion", ReplyAction = "*")]
    Task<ExtApp.GetAppVersionResponse> GetAppVersionAsync(ExtApp.GetAppVersionRequest request);
}

您将其用作存储库中的依赖项，可能如下所示：

public class Repository
{
    private readonly IApplicationSoap _client;

    public Repository(IApplicationSoap client) { _client = client; }

    public async Task<AppVersion> GetAppVersionAsync(int version)
    {
        var request = new GetAppVersionRequest(new GetAppVersionRequestBody(version));
        var response = await _client.GetAppVersionAsync(request);
        return new AppVersion 
        {
            Version = response.Body.Version,
            StartDate = response.Body.StartDate,
            EndDate = response.Body.EndDate
        };
    }
}

在这种情况下，您可能需要测试将输入转换为请求的代码以及将响应转换为 DTO 的代码。这是你的唯一的代码（而不是由工具生成的）。为此，您需要在您的存储库测试中模拟（实际上是 stub）SOAP 客户端合约并让它返回您想要的响应：

[Fact]
public async Task GetAppVersionAsync()
{
    // arrange
    var client = new Mock<IApplicationSoap>(); // mock the interface, not the class!
    var result = new AppVersion
    { 
        Version = 1, 
        StartDate = DateTime.Parse("2010-01-01"),
        EndDate = DateTime.Parse("2015-12-31")
    };
    client.Setup(x => x.GetAppVersionAsync(It.IsAny<GetAppVersionRequest>))
          .Returns(Task.FromResult(new GetAppVersionResponse(new GetAppVersionResponseBody(result))));
    var repository = new Repository(soapApp);

    // act
    var dto = await repository.GetAppVersionAsync(1);

    // assert (verify the DTO state)
    Assert.Equal(1, dto.VersionNumber);
    Assert.Equal(new DateTime(2010, 1, 1), dto.StartDate);
    Assert.Equal(new DateTime(2015, 12, 31), dto.EndDate);
}

但是...仅仅因为您可以这样做并不意味着您应该这样做。