How To Dev

Introduction Test-Driven Development (TDD) is an advanced software development methodology where tests are written before the actual source code is implemented. This process operates in a repetitive cycle: Red (Write a failing test) -> Green (Write the minimum source code to make the test pass) -> Refactor (Optimize the code structure). Advantages : Improve source code quality: Minimize potential bugs right from the initial development phase. Better system design: Thinking about testing first helps you build highly modular, loosely coupled and easy-to-maintain modules. Confident Refactoring: You can comfortably improve and optimize code without fear of breaking existing features, thanks to the automated test system protection. Living documentation: Test cases act as precise specification documentation, helping team members clearly understand how the system operates. Reduce Debugging Time : TDD helps detect errors right at the moment "just finished typing". The c...

Introduction Vitest is a modern testing framework built on Vite. It boasts incredibly fast execution speed by leveraging worker threads, perfect compatibility with the Jest ecosystem (in terms of syntax and API), and excellent support for TypeScript/JSX without complex configuration. In this article, I will guide you on writing unit tests, component tests, and integration tests. Unit Test: Checks independent functions or logic to ensure they work correctly with different inputs. Component Test: Checks the user interface and interactions of individual components. Integration Test: Checks the coordination between multiple components or between the client and the API (often mocked) to ensure smooth business logic flow. Prerequisites This article is implemented on a NextJS project, please initialize a project before continuing. Detail I will continue using content from the Demo AI Agent article to write tests for it, but will need to refactor the code to better support testing as follows: ...