Guide Vitest unit and integration tests with mocks and snapshots.
npx skills add https://github.com/cogidoo/sunchaser --skill vitest-testing-cogidoo
Please help me install this Agent Skill. Skill: vitest-testing Source: https://github.com/cogidoo/sunchaser/tree/main/.agents/skills/vitest-testing Command: npx skills add https://github.com/cogidoo/sunchaser --skill vitest-testing-cogidoo
## What problem does it solve? Vitest best practices and patterns help teams write reliable, maintainable tests with Vitest, ensuring consistent testing standards across projects.
## Core Features & Use Cases
### Quick Start Run a Vitest-driven test suite following standard patterns and mocks to quickly validate changes in your project.
High-intent search queries and answers about installing and using this skill.
Vitest mocks use vi.mock to replace module dependencies and vi.fn to track function calls. These APIs isolate code blocks and verify interactions within describe and it test blocks.
Structure Vitest assertions within describe and it blocks, using beforeEach and afterEach for setup. Handle async tests by awaiting expectations to ensure accurate asynchronous operation validation.
Yes, Vitest snapshots capture and compare serialized output to prevent unexpected regressions. Using snapshot testing maintains consistent component rendering and data structure validation.
Vitest supports test coverage reporting by configuring the coverage provider in vitest.config. This generates detailed metrics on executed code paths during your unit and integration tests.
Vitest mocks fail when vi.mock is called after module imports due to hoisting limitations. Ensure mock factory functions correctly return the mocked module structure before test execution.
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