Building Robust API Tests: a Guide to Unit and Integration Testing
This chapter delves into best practices for testing ASP.NET Core 9 web APIs. We begin by exploring unit testing and the foundations of xUnit. We then layer in the powerful and essential libraries required for writing clean and maintainable tests: AutoFixture, NSubstitute, and FluentAssertions. We will also tackle common real-world controller testing scenarios such as testing pagination and stubbing UrlHelper for URL generation. These are essential skills for unit testing controllers.
The later part of the chapter focuses on integration testing. We will set up and execute web API integration tests that interact with the entire stack. You can be confident that all parts of your application work together as intended. Finally, we will confront one of the toughest challenges in integration testing: handling authentication in your integration test suite.
In this chapter, we’re going to cover the following main...
