Phase 4: Mutation Testing & Behavioral Verification · 90 min · mutmut · cosmic-ray · pytest

Project 2: Mutation Testing Pipeline

Build the pipeline. Enforce the score. Ship with confidence.

Real-world application: Engineers who can build a mutation testing CI pipeline that enforces >80% mutation score demonstrate the ability to create automated quality gates for AI-generated code.

What you will learn

Build a mutation testing CI pipeline for an AI-generated codebase
Enforce >80% mutation score as a CI gate
Document all surviving mutants with kill/equivalent/timeout classification
Generate a mutation report artifact for review
Configure the pipeline to run both standard and AI-specific mutations

Introduction

Project 2: Mutation Testing Pipeline

Objective

Run the complete mutation testing CI pipeline on an AI-generated codebase. Observe the dual-gate approach (standard + AI-specific mutations), enforce >80% threshold for both, and generate a comprehensive mutation report with triage of surviving mutants.

Build the pipeline. Enforce the score. Ship with confidence.

Unlock the full lesson

You've read the first 2 sections. The rest of this lesson covers The Problem, The Concept, Build, Check Yourself, Key Terms & Next — plus a hands-on lab, quiz, and project artifact.

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