Sample code for unit testing api controllers

Question

Is there an sample code that shows unit testing a controller that inherits from the api controller? I am trying to unit test a POST but it is failing. I believe I need to set up the HttpControllerContext for testing but don't know how Thanks

Answer 1

this code should demonstrate the basics of a post test. Assumes you have a repository injected into the controller. I am using MVC 4 RC not Beta here if you are using Beta the Request.CreateResponse(... is a little different so give me a shout...

Given controller code a little like this:

public class FooController : ApiController
{
    private IRepository<Foo> _fooRepository;

    public FooController(IRepository<Foo> fooRepository)
    {
        _fooRepository = fooRepository;
    }

    public HttpResponseMessage Post(Foo value)
    {
        HttpResponseMessage response;

        Foo returnValue = _fooRepository.Save(value);
        response = Request.CreateResponse<Foo>(HttpStatusCode.Created, returnValue, this.Configuration);
        response.Headers.Location = "http://server.com/foos/1";

        return response;
    }
}

The unit test would look a little like this (NUnit and RhinoMock)

        Foo dto = new Foo() { 
            Id = -1,
            Name = "Hiya" 
        };

        IRepository<Foo> fooRepository = MockRepository.GenerateMock<IRepository<Foo>>();
        fooRepository.Stub(x => x.Save(dto)).Return(new Foo() { Id = 1, Name = "Hiya" });

        FooController controller = new FooController(fooRepository);

        controller.Request = new HttpRequestMessage(HttpMethod.Post, "http://server.com/foos");
        //The line below was needed in WebApi RC as null config caused an issue after upgrade from Beta
        controller.Configuration = new System.Web.Http.HttpConfiguration(new System.Web.Http.HttpRouteCollection());

        var result = controller.Post(dto);

        Assert.AreEqual(HttpStatusCode.Created, result.StatusCode, "Expecting a 201 Message");

        var resultFoo = result.Content.ReadAsAsync<Foo>().Result;
        Assert.IsNotNull(resultFoo, "Response was empty!");
        Assert.AreEqual(1, resultFoo.Id, "Foo id should be set");