Code Coverage or Test Coverage is a way to measure what lines of code and branches in your code that are utilized during testing.

But there's also lots of different opinions about using it.

I've been asked many times what I think about code coverage or test coverage.

We'll talk about:

And also the Pareto Principle or 80/20 rule, and the law of diminishing returns and how that applies (or doesn't) to test coverage.

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Links:

• Coverage.py
• pytest-cov