Mutation Testing — Campaign Configuration (mewt/muton)

Note

muton and mewt share identical interfaces but target different languages — mewt for general-purpose languages (Rust, Solidity, Go, TypeScript, JavaScript), muton for TON smart contracts (Tact, Tolk, FunC). All examples use mewt commands, but they work exactly the same with muton . File names change accordingly: mewt.toml → muton.toml , mewt.sqlite → muton.sqlite . When to Use Use this skill when the user: Mentions "mewt", "muton", or "mutation testing" Needs to configure or optimize a mutation testing campaign Wants to run mewt run and needs help getting set up first When NOT to Use Do not use this skill when the user: Wants to analyze or report on completed campaign results Asks about tests or coverage without mentioning mutation testing Quick Start Load workflows/configuration.md — a 5-phase guide from mewt init to a validated, ready-to-run campaign. General question or unfamiliar command? Run mewt --help or mewt --help , then assist. Reference Index File Content workflows/configuration.md 5-phase guide: init, scope, optimize, validate, run references/optimization-strategies.md Per-file targeting, two-phase campaigns, mutation type filtering Essential Commands

Initialize and mutate

mewt init

Create mewt.toml and mewt.sqlite

mewt mutate [ paths ]

Generate mutants without running tests

mewt run [ paths ]

Run the full campaign

Inspect configuration and scope

mewt print config

View effective configuration

mewt print targets

Table of all targeted files

mewt print mutations --language [ lang ]

Available mutation types

mewt status

Mutant count and per-file breakdown

Investigate specific mutants

mewt print mutants --target [ path ]

All mutants for a file

mewt print mutants --severity high

Filter by severity

mewt print mutant --id [ id ]

View mutated code diff

mewt test --ids [ ids ]

Re-test specific mutants

What Results Mean

Caught/TestFail

Tests detected the mutation (good)

Uncaught

Mutation survived — indicates untested logic

Timeout

Tests took too long, inconclusive

Skipped

A more severe mutant already failed on the same line