Unit testing with Moq and EF6

I have built unit testing for my service layer. I have not used Mock as i think that since you are adding/deleting/querying a database, why query a mock as the results could be different, but that isnt what i am asking.

Now i am using Moq to test my web api layer. I think that this is fine, as if all my tests pass on the service layer, it is fine to mock the services to test the web api.

I have managed to write a test for my GetAsync method and it works all fine, like so

Here is the controller

public async Task<IHttpActionResult> GetAsync(long id)
{
    Content content = await _service.GetAsync(id);
    ContentModel model = Mapper.Map<ContentModel>(content);

    return Ok(model);
}

Here is the test

[TestMethod]
public void Content_GetAsync()
{
    // arrange
    var mockService = new Mock<IContentService>();
    mockService.Setup(x => x.GetAsync(4))
        .ReturnsAsync(new Content
        {
            Id = 4
        });

    // setup automapper
    AutoMapperConfig.RegisterMappings();

    // act
    var controller = new ContentController(mockService.Object);
    var actionResult = controller.GetAsync(4).Result;
    var contentResult = actionResult as OkNegotiatedContentResult<ContentModel>;

    // assert
    Assert.IsNotNull(contentResult);
    Assert.IsNotNull(contentResult.Content);
    Assert.AreEqual(4, contentResult.Content.Id);
}

I believe i have wrote this correctly, and it seems to work. Now i would like to test my PostAsync method to add an item. The controller looks like this.

public async Task<IHttpActionResult> PostAsync(ContentModel model)
    {
        Content content = Mapper.Map<Content>(model);

        await _service.AddAsync(content);

        return Created<ContentModel>(Request.RequestUri, Mapper.Map<ContentModel>(content));
    }

And here is the test

[TestMethod]
public void Content_PostAsync()
{
    var mockService = new Mock<IContentService>();
    mockService.Setup(e => e.AddAsync(new Content()))
        .ReturnsAsync(1);

    // setup automapper
    AutoMapperConfig.RegisterMappings();

    // act
    var controller = new ContentController(mockService.Object);
    var actionResult = controller.PostAsync(new ContentModel {
        Heading = "New Heading"
    }).Result;
    var contentResult = actionResult as CreatedAtRouteNegotiatedContentResult<ContentModel>;

    // assert
    Assert.IsNotNull(contentResult);
    Assert.IsNotNull(contentResult.Content);
    Assert.AreEqual("New Heading", contentResult.Content.Heading);
}

Now when i run this, i get a null reference exception. "Request" from the Request.RequestUri is null.

So i changed my controller and tests to this, to try and mock it.

Test code

public Task<IHttpActionResult> PostAsync(ContentModel model)
{
    return PostAsync(model, Request);
}

/// Unit testable version of above.  Cannot be accessed by users              
[NonAction]
public async Task<IHttpActionResult> PostAsync(ContentModel model, System.Net.Http.HttpRequestMessage request)
{
    Content content = Mapper.Map<Content>(model);

    await _service.AddAsync(content);

    return Created<ContentModel>(request.RequestUri, Mapper.Map<ContentModel>(content));
}

Controller code

[TestMethod]
public void Content_PostAsync()
{
    // arrange
    var mockRequest = new Mock<System.Net.Http.HttpRequestMessage>();
    mockRequest.Setup(e => e.RequestUri)
        .Returns(new Uri("http://localhost/"));

    var mockService = new Mock<IContentService>();
    mockService.Setup(e => e.AddAsync(new Content()))
        .ReturnsAsync(1);

    // setup automapper
    AutoMapperConfig.RegisterMappings();

    // act
    var controller = new ContentController(mockService.Object);
    var actionResult = controller.PostAsync(new ContentModel {
        Heading = "New Heading"
    }, mockRequest.Object).Result;
    var contentResult = actionResult as CreatedAtRouteNegotiatedContentResult<ContentModel>;

    // assert
    Assert.IsNotNull(contentResult);
    Assert.IsNotNull(contentResult.Content);
    Assert.AreEqual("New Heading", contentResult.Content.Heading);
}

Now i get an error saying "Invalid setup on a non-virtual (overridable in VB) member: e => e.RequestUri

Can someone please, please help me with this. I am sure i am using Mock correctly in all tests, but unit testing is new to me, so maybe i am just not doing something right.

Thanks in advance