dexploarer/claudius-skills
Overview
This skill generates test mocks, stubs, and fixtures across popular frameworks (Jest, Vitest, pytest, unittest, MSW, etc.). It produces ready-to-use snippets and small helper factories so you can plug mocks directly into tests and speed up test writing. The output is framework-aware and can target functions, classes, modules, APIs, databases, and React components.
How this skill works
I inspect or ask for the target to mock (function, class, API endpoint, DB client, hook), detect the testing framework and language, then emit a minimal, idiomatic mock or fixture. The skill can create simple return-value mocks, spied methods, partial module mocks, MSW handlers, pytest fixtures, Prisma/MongoDB stubs, and factory helpers. You get code that includes setup/teardown where appropriate.
When to use it
- You need a mock for a specific function or class
- Create fixtures or factory data for tests
- Mock an HTTP/GraphQL API response or WebSocket messages
- Stub database clients (Prisma, Mongo) for unit tests
- Replace child components or hooks in React tests
Best practices
- Keep mocks small and focused—mock only what the test needs
- Prefer fixtures or factories for repeated test data to avoid duplication
- Use spies for interaction assertions and simple mocks for return values
- Reset or restore mocks between tests to avoid state leakage
- Choose MSW for integration-level API mocking and jest/vi mocks for unit-level isolation
Example use cases
- Generate a Jest mock for an async fetch module and example test that asserts calls and resolved values
- Create a pytest fixture that yields a mock database client with connect/disconnect teardown
- Produce an MSW handler file for REST and GraphQL endpoints and setup server bootstrap
- Generate a type-safe Vitest/TypeScript mock factory for User objects and a sample test using vi.fn()
- Create a Prisma client mock using jest-mock-extended and an example of mocking user.create
FAQ
Common JS/TS and Python frameworks: Jest, Vitest, Mocha, unittest, pytest, pytest-mock, plus MSW for HTTP and GraphQL.
Can it generate type-safe TypeScript mocks?
Yes. It can output typed factories and vi/jest mocks that include TypeScript signatures and example usage.
20 skills
This skill generates test mocks, stubs, and fixtures for Jest, Vitest, pytest and more to speed up testing.
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