How to mock a melthod with out paramter in Moq AND

问题:

I have see several questions here in Stackoverflow about out parameters in MOQ, my question is how fill this parameter: Lets to code:

[HttpPost]
public HttpResponseMessage Send(SmsMoRequest sms)
{
    if (sms == null)
        return Request.CreateResponse(HttpStatusCode.BadRequest);

    SmsMoResponse response;
    _messageService.Process(sms, out response);
    return Request.CreateResponse(HttpStatusCode.Created, response.ToString());
}

I want to test this post:

[Test]
public void Should_Status_Be_Create_With_Valid_XML()
{
    // Arrange
    var messageServiceMoq = new Mock<IMessageService>();
    SmsMoResponse response;
    messageServiceMoq.Setup(mock => mock.Process(It.IsNotNull<SmsMoRequest>(), out response));
    _kernel.Bind<IMessageService>().ToConstant(messageServiceMoq.Object);
    var client = new HttpClient(_httpServer) { BaseAddress = new Uri(Url) };

    // Act
    using (var response = client.PostAsync(string.Format("Api/Messages/Send"), ValidContent()).Result)
    {
        // Asserts
        response.IsSuccessStatusCode.Should().BeTrue();
        response.StatusCode.Should().Be(HttpStatusCode.Created);
    }
}

Problem

My response object in Send method (POST) is used in post response but the _messageService.Process is responsible to fill the response object. In test method Should_Status_Be_Create_With_Valid_XML I mock _messageService.Process and response object is not fill ocorr error Null reference in Request.CreateResponse(HttpStatusCode.Created, response.ToString());

response is null!

回答1:

Of course response is null, there's no code anywhere that would set it to anything (in your service method or your mock).

Since you're mocking the method that would usually fill it in, it's up to you to specify how it is set. You should fill in the object before calling Setup with what you expect to be the value when that method is called.

Also, see this question for more info.