Mock Object

Definitions

1. A test double that simulates the interface of a real dependency — such as a database client or HTTP service — and records the calls made against it so that a unit test can verify both the return behavior and the interaction pattern without touching real infrastructure.

   In plain English: A fake version of a real component used in testing that lets you check your code called it correctly without actually connecting to the real thing.

   Example: "The mock object for the payment gateway verified we called `charge()` exactly once with the correct amount before returning a fake receipt."

Related Terms

• Chaos Engineering
• A/B Testing
• Code Coverage
• Dependency Injection
• Test Assertion
• Test Case
• Test Mock
• Test Spy