22.12.2021 |

The real test coverage with jest

While running your test jest can also collect test coverage information. For this it tracks which parts of your code are actually used while running your tests. Problem is that by default only code that gets at least loaded by your test cases counts into the total possible code coverage. Solution is using collectCoverageFrom. This allows you to tell jest about all your files that should make up the total possible code that should be covered.

Jan Sauer
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