Test Contract

Define behavioral contracts as test suites. Any class conforming to a protocol must pass the contract tests. Ensures consistent behavior across implementations — human-written, AI-generated, or mock.

When This Skill Activates

Use this skill when the user:

• Designs a protocol and wants to ensure conformance quality
• Has multiple implementations of the same interface (e.g., real + mock + in-memory)
• Says "test the protocol" or "contract test"
• Wants to swap implementations safely (e.g., CoreData → SwiftData)
• Wants to ensure AI-generated implementations meet the spec

Why Contract Tests