Mutation Testing Python Packages

mutmut

Mutation testing system

cosmic-ray

Mutation testing for Python

fest-mutate

Rust cli for blazing fast mutation-testing on Python

sumo-qa

MCP server that brings senior-QA discipline to AI coding assistants — test planning, TDD, mutation testing, code review.

testguard-cli

Claim-driven mutation testing: inject faults and report what your tests miss. Vitest, Jest, Playwright, pytest & unittest. Part of the Guard family with DocGuard and WebSec Validator.

testopshub

基于 pytest 的测试可信度治理实践：批量执行、终端输出结构化解析、Allure 桥接、CI 六步门禁（测试数下限/增量类型检查/依赖分级）拦截删测试换绿；跨平台进程树清理与 Redis 队列可靠性语义。支持 HTTP 与串口/Telnet（模拟验证）协议用例。

universalmutator

Regexp based tool for mutating generic source code across numerous languages

factoryline-code-factory

Evidence-first audits for AI-generated code: prove tests can fail, catch security and release gaps, and ship reviewable receipts across VS Code, JetBrains, CI, MCP, and App Store workflows.

adversary-gate

Executed-evidence verification gate for AI coding agents

bohrin

Check the checker: an open standard for testing the graders of RL environments, with proof before every accusation.

clastogen

Do your LLM evals catch a broken prompt? Mutation testing for system prompts, in pytest.

mutpy

MutPy is a mutation testing tool for Python 3.x source code

wringer

Bounded engineering loops for coding agents: independent checks and review, portable evidence, and measured improvements for future work. Bun/TypeScript.

ordeal

Automated chaos testing for Python — fault injection, property assertions, and stateful exploration

poodle

Effecient Mutation Testing for Python

mutatest

Python mutation testing: test your tests! Safely run mutation trials without source code modifications and see what will get past your test suite.

detective-spec

Writes the behavioral contract for a Python function — every behavior pinned by a test, every question it cannot answer named

wesker

In-process AST mutation testing for Python — one mutant per behavioral dimension, zero deps

adversary-gate-mcp

Executed-evidence verification gate for AI coding agents

muttfuzz

A tool for meta-fuzzing using program mutants

deployproof

Deterministic pre-push verification for AI-assisted codebases: AST mutation testing, credential scanning, sandbox-escape detection, mock-usage alerts, and dependency hallucination defense.

muteval

Mutation testing for your LLM evals — degrade the system under test and check whether your evals would actually catch a regression.

gdmutant

Mutation testing for GDScript and Godot: find the bugs your green tests would miss.

precheck

Make an agent prove its claims with checks it was not allowed to write. The check is frozen before the run, then audited for the ability to fail at all.