Setup Guide: Writing Tests in NextJS with Vitest
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: ...