AI BriefingApplying TDD in Practice
Key point
This explains the **Red-Green-Refactoring** cycle, the core of TDD, from a practical perspective using an xUnit implementation example.
Details
In an environment where applications are continuously updated, ensuring that existing features behave correctly is essential. To this end, writing test code, and going further to secure quality from the early stages of development through Test-Driven Development (TDD), is an important approach.
TDD is a methodology proposed by Kent Beck, whose core idea is to write tests before writing the code that makes them pass. The development process consists of repeating the following three-step Red-Green-Refactoring cycle.
- Red: First write a test that doesn't even compile or that fails.
- Green: Write the minimal code needed to pass the test.
- Refactoring: Under the protection of the tests, remove duplication in the code and improve its structure.
You can practice TDD by building a simple xUnit runner using JUnit in a Java environment. When writing tests, it is recommended to use the 3A pattern (Arrange, Act, Assert) or the GWT pattern (Given, When, Then) to clearly reveal the intent of the test.
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