Testing Web API

In this recipe, you will learn how to test Web API controllers with Moq and xUnit.

Getting ready

Let's create a class library project with VS 2017, and use the ProductAPIController methods created in the Using ActionResults recipe of this chapter. We will create some test cases for this API.

How to do it...

1. First, let's create a class library project in the solution:

2. Next, we will change the generated code in the project to import xunit, dotnet-test-xunit, and moq. We will also have to add the reference on the Web API project.

3. Here are some of the test methods:

public class ProductApiControllerTests
{
  #region Tests for GET : api/productapi
  [Fact]
  public void GET
  _Returns404NotFoundResultIfProductListHaveNoItemsInRepo()
  {
    // Arrange
    var mockRepo = new Mock<IProductRepository>();
    var emptyProductList = GetEmptyProductsList();
    mockRepo.Setup(repo => repo.GetAllProducts())
    .Returns(emptyProductList);
    var controller = new ProductApiController...