unit-testing

To set up Vitest for unit testing in a TypeScript Next.js project, you follow step-by-step configuration instructions provided by the skill, establishing the test environment and enabling TDD workflows.

The Test-Driven Development (TDD) workflow for unit tests follows a RED → GREEN → REFACTOR methodology: write a failing test first, implement minimal code to pass it, then refactor safely.

Yes, you can use this TDD approach to test Zod validation and async operations. The skill demonstrates common testing patterns and best practices for structuring these specific scenarios in Vitest.

Vitest works well with TypeScript and Next.js, providing robust mocking capabilities for dependencies. The skill guides users through structuring tests and utilizing mocking patterns within this stack.

You should use Test-Driven Development when starting a new feature, utility function, or module. Write your first failing test before any implementation code to ensure robust, reliable logic.