test-doubles

1 free lesson tagged test-doubles across Programming. Each one is a short sequence of focused steps with narration and a five-question quiz at the end — take them in any order, no signup required.

Programming

intermediate

Test Doubles: Isolation and What It Costs

Replacing a real dependency with a stand-in is what makes a unit test fast, deterministic, and able to reach states you cannot otherwise produce. It is also how a suite ends up green while the system is broken. This lesson covers the five kinds of double, when each is right, and the two failure modes that follow every team who reaches for mocks by reflex.

8 steps·~12 min

Test Doubles: Isolation and What It Costs

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