MutPy

MutPy is a mutation testing tool for Python 3 source code. It applies mutations at the level of the abstract syntax tree and runs the tests against each mutant.

It supports the standard unittest module, generates YAML and HTML reports and shows coloured output in the terminal. Higher order mutations, which combine several changes in one mutant, can be used to reduce the number of mutants and speed up the analysis.

MutPy is open source under the Apache 2.0 licence. Its code has not changed since April 2024.