intermediate~3h
Production Testing Strategy, Coverage, and Anti-Patterns
How to decide what actually deserves a unit test, an integration test, or no test at all; what JaCoCo's line and branch coverage numbers really measure (and don't); and how to recognize the handful of testing anti-patterns that quietly make a suite slow, brittle, or falsely reassuring.
Learning objectives
- Allocate a realistic test suite across domain logic, service layer, controllers, repositories, and end-to-end flows
- Distinguish line coverage from branch coverage and explain why 100% of either is not a meaningful quality target
- Identify testing anti-patterns such as assertion-free tests, overuse of mocks, and testing implementation details
- Diagnose and fix the most common sources of slow or flaky test suites
- Apply a practical heuristic for choosing between a unit test, an integration test, and no test at all
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Production Testing Strategy, Coverage, and Anti-Patterns