Testing Anti-Patterns

Frequent unit testing anti-patterns include testing mock behavior instead of actual logic, using test-only methods in production code, over-mocking dependencies, and creating incomplete mocks that reduce overall test reliability.

To review test code for anti-patterns, analyze your test suite to detect mock overuse and incomplete mocks, then replace excessive mock assertions with integration tests to improve maintainability and align with TDD best practices.

Testing mock behavior makes unit tests unreliable because it verifies the mock's internal implementation rather than the actual software logic, causing tests to break unexpectedly when mock configurations change without real defects occurring.

You should replace mock overuse with integration tests when unit tests heavily verify mock interactions instead of real outcomes, ensuring your test suite validates actual software behavior and maintains high reliability across development workflows.

Using test-only methods in production code violates TDD best practices by exposing internal implementation details purely for testing, which degrades software maintainability and couples your tests to internal code structure.