如何模拟其他方法内部的方法调用返回

debugcn 发表于 Dev

开尔文沙

我想知道是否有可能模拟在目标测试方法中实例化的类的方法的返回。此处的不同点是，要实例化此对象，必须在其构造函数中传递从静态类返回的对象。按照示例进行更清晰的说明。

public async Task Invoke(HttpContext httpContext)
{
    GrpcChannel channel = GrpcChannel.ForAddress("address");
    var client = new MethodDescriptorCaller(channel);
    client.CallGrpcAsync(); //I need to mock the return of this method
}

到目前为止，我的想法是将该过程封装在另一个类中。并使用依赖注入来模拟该返回。但是，我认为这是一个非常糟糕的解决方案。

chi

我不认为要建立工厂并注入它，这对所有IMO都是一个不好的解决方案

我认为应该是这样的...

interface IMethodDescriptorCallerFactory
{
  MethodDescriptorCaller Build(GrpcChannel channel);
}

class MethodDescriptorCallerFactory : IMethodDescriptorCallerFactory
{
  MethodDescriptorCaller Build(GrpcChannel channel)
  {
    return new MethodDescriptorCaller(channel);
  }
}

class Foo
{
  IMethodDescriptorCallerFactory _methodDescriptorCallerFactory;

  public Foo(IMethodDescriptorCallerFactory methodDescriptorCallerFactory)
  {
    _methodDescriptorCallerFactory = methodDescriptorCallerFactory
  }

  public async Task Invoke(HttpContext httpContext)
  {
      GrpcChannel channel = GrpcChannel.ForAddress("address");
      var client = _methodDescriptorCallerFactory.Build(channel);
      client.CallGrpcAsync(); //I need to mock the return of this method
  }
}


class FooTest
{
  [Fact]
  public async Task Test_Invoke()
  {
    var methodDescriptorCaller = Mock.Of<MethodDescriptorCaller>(m =>
        m.CallGrpcAsync() == Task.Completed
    );

    var methodDescriptorCallerFactory = Mock.Of<IMethodDescriptorCallerFactory>(m =>
        m.Build(It.IsAny<GrpcChannel>()) == methodDescriptorCaller
    );

    var foo = new Foo(methodDescriptorCallerFactory);

    var httpContext = Mock.Of<HttpContext>();

    await foo.Invoke(httpContext);

    Mock.Get(methodDescriptorCallerFactory).VerifyAll();
    Mock.Get(methodDescriptorCaller).VerifyAll();
  }
}

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