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    31 year ago

    Test coverage is defined as the percentage of your application’s functionality that is being covered by the automated tests.

    Usually this is measured in lines of code. You run the automated tests, then for every line of code, you track whether it’s executed or not. If 20% of lines were never executed during the test run, your test coverage is 80%.

    Software teams will often aspire to reach high coverage, because lines that are never executed during testing are a good place where bugs can hide. However it’s generally acknowledged that this isn’t a foolproof method to get rid of bugs, and reaching 100% coverage can be more effort than it’s worth. Often you have critical code sections that should be covered by multiple tests, and unimportant sections that are unlikely to fail.