Mutation testing for Elixir

Muzak is a mutation testing library for Elixir applications. It is open source under the CC-BY-NC-ND-4.0 license and available on Information on getting started with Muzak can be found in its documentation.

Muzak Pro

Muzak Pro is a full-featured, paid version of Muzak. It costs $29/month, and you can cancel your subscription at any time. If you end up unsatisfied with Muzak Pro for any reason, you can email me and I’ll happily give you a full refund. Muzak Pro includes:

  • No limit on the number of generated mutations
  • Over a dozen additional mutators
  • git integration to speed up mutation testing in CI
  • Far more configuration options at the command line and with a .muzak.exs file
  • Extensive documentation about how to best use mutation testing
  • Parallel execution through spawning multiple BEAM nodes (experimental)
  • "Analysis Mode" to identify potentially low-value or duplicate tests in your test suite (coming soon)
  • Enhanced reporting, including HTML reports (coming soon)
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Can I get a free Muzak Pro subscription for my open source project or non-profit company?

Probably! Email me and we can try and figure something out.