Changelog

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Mutalisk follows Semantic Versioning. Before 1.0, the public CLI, configuration, reports, and runtime helpers may change between minor releases.

0.1.0

Initial release: mutation testing for Elixir 1.19 and newer.

  • MIX_ENV=test mix mut plans mutations and runs selected tests in isolated subprocesses, using schema instrumentation or fallback recompilation.
  • 13 default mutators and 17 additional opt-in or explicit-only mutators. See the mutator catalogue.
  • Coverage-based selection with conservative static fallbacks, transitive module references, and support for custom source roots and umbrella layouts.
  • Fallback compilation preserves project configuration, compiler options, and each umbrella application's compilation context.
  • Terminal and Stryker-compatible JSON reports by default; optional HTML and GitHub Actions reporters. JSON reports identify killing test files.
  • Configuration through .mutalisk.exs, application config, and CLI flags; source exclusions and @mutalisk_ignore for generated or intentionally untested modules.
  • Configurable per-test and whole-suite timeouts. Derived suite budgets use the baseline duration, with a cap and a per-test timeout floor.
  • Sandbox resets restore sources and priv/ files, directories, and symlinks; optional content hashing detects same-size fixture rewrites.
  • Opt-in incremental history reuses verdicts only when project, mutant, and test digests match. Fingerprints include custom source roots and transitive path dependencies. Malformed or old history starts cold.
  • Public Mutalisk helpers to inspect, set, and clear the VM-global active mutant.
  • Apache License 2.0; no production dependencies.