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. If a test suite passes on mutated code, then you have a mismatch between your tests and your functionality.
Cosmic Ray has been successfully used on a wide variety of projects ranging from assemblers to oil exploration software.
This documentation is a bit out of date, but we’re working to get it in good order!