WHAT IS TEST DOUBLE

Preface In order to pursue engineering excellence, I recently started to learn about TDD (Test-Driven Development). Therefore, it is inevitable to come across the concept of Test Double. As a non-native English speaker, when I saw this word, I really thought it meant test twice. With deeper understanding, I gradually learnt about Dummy, Fake, Stub and other Test Double terms. I’m sure you’re like me and were confused when you were first introduced to these concepts.