Testing
Test Coverage and Quality
Measuring and improving test coverage
Interview: Engineering excellence
Coverage
Test coverage measures what percentage of your code is exercised by tests. While 100% coverage doesn't guarantee bug-free code, low coverage guarantees untested paths.
Coverage Targets
- 80%+: Good baseline for application code
- 90%+: Expected for library/SDK code
- 100%: Critical paths (payment, auth, data integrity)