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testing

Use this skill when writing, reviewing, or debugging tests across the codebase. It provides comprehensive testing guidance organized by context, covering CLI, API, web, and Rust applications. The skill emphasizes integration testing at system entry points, mocking only external service boundaries, and testing observable behavior rather than implementation details.

View source Repository: vm0

Install in Claude Code

Copy

git clone --depth 1 https://github.com/vm0-ai/vm0 /tmp/testing && cp -r /tmp/testing/.claude/skills/testing ~/.claude/skills/testing

Then start a new Claude Code session; the skill loads automatically.

Definition

SKILL.md

# Testing Skill

Use this skill when writing tests, reviewing test code, or investigating test failures.

## Documentation

Read the testing guide and relevant reference based on context:

| Context | Primary | Reference |
|---------|---------|-----------|
| General | [docs/testing.md](../../../docs/testing.md) | — |
| Anti-patterns | [docs/testing.md](../../../docs/testing.md) | [anti-patterns.md](../../../docs/testing/anti-patterns.md) |
| Patterns | [docs/testing.md](../../../docs/testing.md) | [patterns.md](../../../docs/testing/patterns.md) |
| CLI (`turbo/apps/cli`) | [docs/testing.md](../../../docs/testing.md) | [cli-testing.md](../../../docs/testing/cli-testing.md) |
| CLI E2E (`e2e/tests/`) | [docs/testing.md](../../../docs/testing.md) | [cli-e2e-testing.md](../../../docs/testing/cli-e2e-testing.md) |
| API (`turbo/apps/api`) | [docs/testing.md](../../../docs/testing.md) | [api-testing.md](../../../docs/testing/api-testing.md) |
| Web (`turbo/apps/web`) | [docs/testing.md](../../../docs/testing.md) | [api-testing.md](../../../docs/testing/api-testing.md#migration-from-appsweb) |
| App (`turbo/apps/platform`) | [docs/testing.md](../../../docs/testing.md) | [app-testing.md](../../../docs/testing/app-testing.md) |
| Rust (`crates/`) | [docs/testing.md](../../../docs/testing.md) | [rust-testing.md](../../../docs/testing/rust-testing.md) |
| Python addon (`crates/runner/mitm-addon`) | [docs/testing.md](../../../docs/testing.md) | [mitm-addon-testing.md](../../../docs/testing/mitm-addon-testing.md) |

## Key Principles

1. **Integration tests are primary** — test at system entry points
2. **Mock at the boundary** — only mock external services, not internal code
3. **Use real infrastructure** — real database, real filesystem (temp dirs)
4. **Test behavior, not implementation** — verify outcomes, not mock calls