c# - Moq & C# : Invalid callback. 带参数的方法设置无法调用带参数的回调

Question

实际的接口(interface)签名是这样的

Task<GeneralResponseType> UpdateAsync(ICustomerRequest<IEnumerable<CustomerPreference>> request, CancellationToken cancellationToken, ILoggingContext loggingContext = null);

测试用例:

ICustomerRequest<IEnumerable<CustomerPreference>> t = null;
CancellationToken t1 = new CancellationToken();
LoggingContext t2 = null;
this.customerPreferenceRepositoryMock.Setup(x => x.UpdateAsync(
        It.IsAny<ICustomerRequest<IEnumerable<CustomerPreference>>>(),
        It.IsAny<CancellationToken>(),
        It.IsAny<LoggingContext>()))
    .Callback<ICustomerRequest<IEnumerable<CustomerPreference>>,CancellationToken, LoggingContext>((a, b, c) => { t = a ; t1 =b;t2= c; });

设置在测试用例中抛出异常，如下

Invalid callback. Setup on method with parameters (ICustomerRequest1,CancellationToken,ILoggingContext) cannot invoke
callback with parameters
(ICustomerRequest1,CancellationToken,LoggingContext).

我做错了什么？

我已验证Moq: Invalid callback. Setup on method with parameters cannot invoke callback with parameters

但我没有看到任何帮助。

Answer 1

正如评论中提到的 Callback使用的参数与方法定义不匹配。即使Setup使用It.IsAny<LoggingContext>方法定义使用 ILoggingContext参数

更改t2至

ILoggingContext t2 = null;

并更新Callback至

.Callback<ICustomerRequest<IEnumerable<CustomerPreference>>,CancellationToken, ILoggingContext>((a, b, c) => { 
    t = a; 
    t1 = b;
    t2 = c; 
});

或

.Callback((ICustomerRequest<IEnumerable<CustomerPreference>> a, 
           CancellationToken b, 
           ILoggingContext c) => { 
        t = a; 
        t1 = b;
        t2 = c; 
    });

无论哪种方式都可以。

我还建议 Setup返回已完成的Task以便测试按预期异步进行。

this.customerPreferenceRepositoryMock
    .Setup(x => x.UpdateAsync(
        It.IsAny<ICustomerRequest<IEnumerable<CustomerPreference>>>(),
        It.IsAny<CancellationToken>(),
        It.IsAny<LoggingContext>()))
    .Callback((ICustomerRequest<IEnumerable<CustomerPreference>> a, 
               CancellationToken b, 
               ILoggingContext c) => { 
                    t = a; 
                    t1 = b;
                    t2 = c; 
                    //Use the input to create a response
                    //and pass it to the `ReturnsAsync` method
             })
    .ReturnsAsync(new GeneralResponseType()); //Or some pre initialized derivative.

查看最小起订量 QuickStart更好地了解如何使用该框架。