go-mutesting

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Runs on Linux.

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go-mutesting is ranked #13 of 25 in mutation testing tools on The Geeks Club. It runs on Linux.

Compared on mutation testing tools

Supported languages: Go
Test frameworks: Go package tests
Surviving mutant reports: Yes
Mutation operators: Branch: case, if, else; expression: comparison, remove; statement: remove; Cosmos SDK: arithmetic, comparison

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The record

Purpose: go-mutesting is a framework for mutation testing Go source code to find code not covered by tests.
Mutation score: It reports a mutation score based on how many generated mutations are killed by the test suite.
Targets: Targets can be Go source files, directories, or packages, including recursive `...` patterns; `_test` files are excluded.
Execution: By default, it replaces the original file with a mutation, runs that package’s tests, and reports whether the mutation was killed.
Custom execution: Users can supply an external exec command to test mutations, with environment variables describing each mutation and exit codes indicating killed, alive, skipped, or unknown outcomes.
Mutators: Built-in mutators cover branches, comparisons, boolean expressions, statement removal, and Cosmos SDK arithmetic and comparisons.
Extensibility: Custom mutators can be implemented through the Mutator interface and registered for use by the binary.
False positives: A checksum blacklist can ignore false positive mutations, but the README says the feature is poorly implemented because source changes alter checksums.
Integration: The tool can run Go package tests by default and supports external test commands through `--exec`.
License: The repository identifies its license as MIT.
Support: The README invites users to make feature requests and report bugs or problems.
Intended use: The README describes go-mutesting as an addition to automatic test suites and says it can help compare automatically generated and manually written test suites.

Where it ranks on The Geeks Club

Best Mutation Testing Tools in 2026#13 of 25

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Sources

github.com/merlins-labs/go-mutesting· checked 4 Oct 2026