How should I use Mocking and Fakes under .NET Core 1.1 or higher?

Question

I have been using .NET Framework 4.X for years and I just switched to .NET Core . Since I want to do TDD, I want to use a mocking framework and microsoft fakes. However, it is not clear to me how to do that for .NET Core since the classical solutions are not supported.

Can someone tell me how I should use Mocking and Fakes under .NET Core 1.1?

Never used microsoft fakes, but we use a combination of xUnit, NSubstitute and AutoFixture in our ASP.NET Core projects and it works like a charm.. so you can check those out. — jpgrassi, Apr 27 '18 at 08:00
It's on their roadmap. See https://developercommunity.visualstudio.com/idea/351467/support-microsoft-fakes-on-net-core.html. — Mike Lowery, May 30 '19 at 22:39

score 4 · Accepted Answer · answered Oct 04 '18 at 11:24

4

Install "Moq" using nuget
Create unit-test using NUnit or similar

Write something like this:

    // Arrange
    var mock = new Mock<IRepository>();
    mock.Setup(repo=>repo.GetAll()).Returns(GetTestPhones());
    var controller = new HomeController(mock.Object);

    // Act
    var result = controller.Index();

    // Assert
    var viewResult = Assert.IsType<ViewResult>(result);
    var model = Assert.IsAssignableFrom<IEnumerable<Phone>>(viewResult.Model);
    Assert.Equal(GetTestPhones().Count, model.Count());

answered Oct 04 '18 at 11:24

Dzianis Yafimau

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Although this works as it's supposed to, it's not a good approach to check a collection size with Assert.Equal. [Take a look here](https://stackoverflow.com/questions/46653557/whats-the-idiomatic-way-to-verify-collection-size-in-xunit) – Mohammad Azhdari Oct 10 '18 at 05:53
3

This doesn't mention Microsoft Fakes. What about Shims and Stubs? – IEnjoyEatingVegetables Oct 10 '18 at 19:44
Sorry, didn't think it is about certain framework, I understood question as general mocking and faking – Dzianis Yafimau Oct 11 '18 at 05:36

How should I use Mocking and Fakes under .NET Core 1.1 or higher?

1 Answers1