Testing Controller Action Methods
Explore how to implement automated tests for ASP.NET Core controller actions by mocking dependencies like cache and data repositories with Moq. Learn to create predictable tests for methods that fetch questions asynchronously, including handling search parameters and verifying results. Understand how to test for both found and not found scenarios to ensure reliable backend API behavior.
We are going to create tests for some question controller actions.
Our API controller has dependencies for a cache and a data repository. We don't want our tests to execute the real cache and data repository because we require the data in the cache and data repository to be predicable. This helps us get predicable results that we can check. In addition, if the tests are running on the real database, the test execution will be much slower. So, we are going to use a library called Moq to help us replace the real cache and data repository with fake implementations that give predicable results.
Let's get started:
First, we need to reference the “QandA” project from the
BackendTestsproject. We can do this by right-clicking on the “Dependencies” node in “Solution Explorer” in theBackendTestsproject and choosing “Add Project Reference...”:
Then, we need to tick the “QandA” project and click the “OK” button:
Let's install “Moq” into our test project using “NuGet Package Manager”:
The BackendTests ...