Summary
This handles test isolation by replacing dependencies with mocks, stubs, and spies so you can unit test without hitting real databases, APIs, or file systems. It covers Jest for JavaScript/TypeScript, unittest.mock for Python, and Mockito for Java, plus patterns for things like simulating errors and verifying interactions. The guidance on mocking at boundaries (repositories, services) rather than mocking everything you own is solid advice that will keep your tests maintainable. Best used when you need fast, deterministic tests and want to avoid the brittleness that comes from over-mocking internal implementation details.
Install to Claude Code
npx -y skills add aj-geddes/useful-ai-prompts --skill mocking-stubbing --agent claude-codeInstalls into .claude/skills of the current project.
Keep your Mac awake while Claude Code and 40+ AI agents run. Sleeps when they're idle.
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Integrate web data into your AI product. One API to scrape website & brand data.
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Agent, run crypto. Access onchain data & trade routes via 1inch.
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On Capafy, your Skill runs online 24/7 as an agent product, and you get paid every time someone uses it.
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Files
SKILL.md
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Featured
Keep your Mac awake while Claude Code and 40+ AI agents run. Sleeps when they're idle.
One time payment $9 →Integrate web data into your AI product. One API to scrape website & brand data.
Get API Key Now →Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →On Capafy, your Skill runs online 24/7 as an agent product, and you get paid every time someone uses it.
Start earning →
