Mock

Definition

A fake object replacing a real dependency in tests, with configurable return values and call verification.

Example in context

"We mock the Stripe SDK in tests — no real payments, but we verify the correct method is called with the right arguments."

Related terms

• Stub — A simplified replacement for a real object that returns predefined responses — simpler than a mock, no verification.
• Dependency injection — A design pattern where dependencies are passed in from outside rather than created internally — improves testability and flexibility.