Guide test double selection to isolate code under test from dependencies.
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Test doubles help isolate the code under test (SUT) from dependencies, speeding up unit tests and improving reliability by avoiding flaky external systems.
Identify the DOCs involved, choose appropriate double types, and inject them into your unit tests to isolate the SUT.
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A stub returns predefined outputs for given inputs to support state-based tests, while a mock defines interaction expectations like arguments, call counts, and sequence to verify behavior during unit isolation.
To isolate the SUT from slow or nondeterministic dependencies, identify the dependent components, select appropriate test doubles like stubs or mocks, and inject them to ensure fast, deterministic tests.
Use a spy to combine stub behavior with interaction verification, and use a fake when you need a lightweight in-memory implementation for simple testing scenarios.
The best way to verify repository interactions without touching the database is replacing the repository with a mock or stub test double to verify service behavior quickly and deterministically.
Unit tests using test doubles can fail intermittently if double contracts and interaction expectations are loosely defined, causing fragility when call sequences or argument mismatches occur during verification.
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