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Mutation testing

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Cosmic Ray: mutation testing for Python

“Four human beings – changed by space-born cosmic rays into something more than merely human.” — The Fantastic Four

Cosmic Ray is a mutation testing tool for Python 3.

It makes small changes to your source code, running your test suite for each one. Here’s how the mutations look:

docs/cr-in-action.gif

Read the full documentation at readthedocs.

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