Shadow Testing Skill

Purpose [LEVEL 1]

Shadow testing creates isolated container environments where you can test local uncommitted changes without affecting your host system or pushing to remote repositories.

Key Principle: Test exactly what's on your machine (including uncommitted changes) in a clean, isolated environment that mirrors CI.

When to Use This Skill [LEVEL 1]

Perfect For

• Pre-Push Validation: Test changes before committing/pushing
• Multi-Repo Coordination: Validate changes across multiple repositories work together
• Clean-State Testing: "Does it work on a fresh machine?"
• Library Development: Test library changes with dependent projects
• CI Parity: See what CI will see before pushing
• Destructive Testing: Tests that modify system state won't affect host