Vitest Testing Patterns

The vitest-testing-patterns skill provides AI agents with structured approaches to writing efficient unit tests using Vitest. It guides the generation of test cases that cover edge cases, mocking dependencies, and ensuring fast execution cycles for modern JavaScript projects.

When to use it

• You need to generate comprehensive unit tests for a new React or Vue component quickly.
• Your team requires a standardized testing setup to ensure consistency across multiple developers.
• You are refactoring legacy code and need automated test coverage to prevent regressions.
• You want to optimize build times by leveraging Vitest's parallel execution features.

Key capabilities

• Generates Vitest configuration files tailored to specific project structures.
• Creates test suites that isolate components by mocking external dependencies like APIs or databases.
• Produces assertions for edge cases, null values, and error handling scenarios.
• Outputs code compatible with modern JavaScript runtimes including Node.js and browsers.

Example prompts

"Create a Vitest test suite for my UserAuth component that mocks the backend login API." "Generate a configuration file for Vitest to run in parallel across my monorepo structure." "Write unit tests for this utility function using Vitest, ensuring coverage for empty arrays and invalid inputs."

Tips & gotchas

Ensure your project has Vitest installed before requesting test generation to avoid dependency errors. Focus on providing clear component interfaces or function signatures to help the agent create accurate mocks.