vitest-mocking

What problem does it solve?

Vitest mocking patterns and test double strategies. Use when writing tests that need mocks, spies, stubs, or fakes. Triggers include: mocking modules, stubbing globals (fetch, Date, timers), testing composables, mocking imports (default/named), creating test doubles, replacing dependencies, verifying mock calls, cleaning up mocks, or any question about "how do I mock X in Vitest". Also use when reviewing tests for proper mocking practices.

Core Features & Use Cases

• Comprehensive patterns for mocks, spies, stubs, and fakes in Vitest.
• Mock modules, mock globals, verify calls, and clean up mocks across tests.
• Use cases across Vue/React projects, including timers, network, and external dependencies.

Quick Start

Install Vitest in your project and start a test using vi.mock, vi.spyOn, and vi.fn to create deterministic tests. Example: ensure you can mock a module, verify calls, and reset mocks between tests.