"Code coverage" (synonym: test coverage) is a measure of the amount of application source code that has been exercised, usually by some testing regime, often by unit testing.

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While code coverage is a good number to look at in terms of reach achieved in a testing cycle, is it foolproof? Is this metric a silver bullet for understanding the team’s coverage and vouching for testing scope? In short, no. But it is a vital step on the way to solving your testing coverage issues.