Test Doubles - what it is and how to use it in application testing?

In the article 'Test Doubles - What is it?' the author, Sebastian Malaca, discusses the topic of test doubles in the context of software testing. He explains the differences between various types of doubles, such as stubs, mocks, spies, and fakes. Each of these types has specific applications and can be used in different situations depending on the needs of the project and the functionalities being tested. The author emphasizes that doubles are an incredibly important tool in software engineers' arsenals, allowing for easier testing of code in isolation while reducing the influence of external systems. Additionally, Malaca points out that proper use of doubles can greatly speed up the testing process and contribute to higher quality of the final product. In the conclusion of the article, he stresses that understanding and being able to use test doubles is crucial in fully realizing the potential of unit tests and enhancing project efficiency.