tech-vitest

What problem does it solve?

This Skill provides standardized Vitest-based testing utilities, mocks, and assertion patterns to help teams write reliable, maintainable tests without bespoke, ad-hoc setups.

Core Features & Use Cases

• Mocking utilities: Use vi.fn, vi.mock, and vi.spyOn to simulate dependencies while preserving real behavior when needed.
• Assertions patterns: Apply Vitest expect matchers for precise, readable test failures.
• Lifecycle hooks & timers: Employ beforeEach/afterEach and vi.useFakeTimers to ensure deterministic test execution.
• MSW integration: Seamlessly mock external HTTP calls with MSW to validate network paths without real services.
• Use Case: Write unit tests for a UI component that fetches data, mock API responses, and verify UI state transitions.

Quick Start

Install Vitest in your project, then start writing tests using vi.fn/vi.mock and the Vitest patterns described in this Skill.