Can I use this for mocking external APIs?

Yes, it provides patterns for mocking common HTTP clients like Axios and Node.js built-in modules to simulate network responses.

What is the 'mock boundaries' principle mentioned?

It is a best practice that suggests mocking external dependencies (like APIs) while avoiding mocking internal logic, which keeps tests from becoming fragile during refactoring.

How does this skill help with TypeScript testing?

The skill includes specific patterns for using vi.mocked() which provides full type safety and IDE autocompletion when interacting with mocked modules.

How do I handle time-sensitive code with these strategies?

The skill covers vi.useFakeTimers() and system time mocking, allowing you to advance time or set specific dates to test intervals and timeouts.

Vitest Mocking Strategies

Name: Vitest Mocking Strategies
Author: IvanTorresEdge

byIvanTorresEdge

Seguridad y Pruebas

Implements advanced mocking patterns and best practices for Vitest to isolate units and simulate external dependencies.

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This skill provides a comprehensive set of strategies for mocking dependencies in JavaScript and TypeScript environments using Vitest. It guides developers through implementing function mocks, method spies, module-level overrides, and timer manipulation. By emphasizing the core principle of mocking boundaries rather than internals, it helps create resilient test suites that handle external APIs, database calls, and time-sensitive logic without compromising test reliability or speed.

Características Principales

Timer and Date manipulation for testing time-dependent logic
0 GitHub stars
Standardized patterns for clearing and restoring mocks between tests
Function and method mocking with vi.fn() and vi.spyOn()
Module-level mocking for internal files and external npm packages
Type-safe mocking implementations using vi.mocked()

Casos de Uso

Isolating unit tests from external API responses and database side effects
Creating mock implementations for Node.js built-ins like the file system
Testing complex time-based behaviors like debouncing or scheduled notifications

Acerca de

Características Principales

Timer and Date manipulation for testing time-dependent logic
0 GitHub stars
Standardized patterns for clearing and restoring mocks between tests
Function and method mocking with vi.fn() and vi.spyOn()
Module-level mocking for internal files and external npm packages
Type-safe mocking implementations using vi.mocked()

Casos de Uso

Isolating unit tests from external API responses and database side effects
Creating mock implementations for Node.js built-ins like the file system
Testing complex time-based behaviors like debouncing or scheduled notifications