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A fake version of a dependency used in tests or local development.
Mocks replace slow, expensive, random, or external systems with controlled behavior. They make tests stable but can hide real integration problems if overused.
Plainly
Think of Mock as a simple recipe for doing the work better. A fake version of a dependency used in tests or local development.
In practice
Use it when you need a repeatable method instead of guessing from vibes. In practice, define the owner, input, output, and failure mode before you rely on it.