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---
name: test-mocking-rules
description: Guidelines for when and how to use mocks in tests
languages: [python, typescript, javascript, go, rust, java, csharp, php, ruby]
subagents: [test/unit, test/integration]
tools_needed: []
---
## Mocking Rules
### When to Mock
- Mock only at process boundaries:
- Database connections
- Network calls (HTTP, external APIs)
- Filesystem operations
- Time/date functions
- Random number generation
### What NOT to Mock
- **Never mock the thing under test**
- **Never mock internal helpers** — test them through the public interface
- **Never mock your own database** in integration tests
### Consistency
- Use the mock library from core-conventions.md consistently
- Follow the same mocking patterns across the codebase
