Summary
In this chapter, we’ve explored two pivotal patterns essential for writing clean code and enhancing our testing strategies: the Mock Object pattern and the Dependency Injection pattern.
The Mock Object pattern is crucial for ensuring test isolation, which helps avoid unwanted side effects. It also facilitates behavior verification and simplifies test setup. We discussed how mocking, particularly through the unittest.mock module, allows us to simulate components within a unit test, demonstrating this with a practical example.
The Dependency Injection pattern, on the other hand, offers a robust framework for managing dependencies in a way that enhances flexibility, testability, and maintainability. It’s applicable not only in testing scenarios but also in general software design. We illustrated this pattern with an initial example that integrates mocking for either unit or integration tests. Subsequently, we explored a more advanced implementation using a...
