12 Best Code Test Coverage Tools in 2026 -...

Why code test coverage matters in 2026 Code coverage is the most widely used metric for measuring test quality. It tells you what percentage of your codebase is actually exercised when your test suite runs - and more importantly, it reveals which parts of your code have no tests at all. Without coverage measurement, teams are guessing about test effectiveness. A project might have 500 tests that all pass while leaving critical business logic completely untested. Coverage tools eliminate this gue