DIFFBLUE TEST QUALITY AGENT
Will your test suite actually catch defects? Measure its strength for free.
Mutation testing finds the gaps your coverage is hiding. Diffblue Test Quality Agent combines the most accurate ways to assess the regression detection power of your test suite for Java and Python in one free, actionable report.
Install CLI:
Or follow the manual instructions
A complete view of test quality—not just coverage
We automatically introduce small, realistic code changes and check whether your tests detects them. If they don’t, your test suite has blind spots—even if coverage looks strong.
Analyze your Java or Python codebase to see:
- Where tests are thorough
- Where they’re superficial
- And where critical logic is insufficiently protected
- All in a single, audit-ready report
Mutation testing
Why is mutation testing so critical?
Mutation coverage is the gold standard KPI for measuring the defect catching power of a test suite. But measuring it is time-consuming, error-prone, and not widely understood.
How does Diffblue Test Quality Agent work?
Install and run locally
Install with a single command on macOS, Linux, or Windows. Configure your AI coding agent — Claude or Copilot — and you’re ready to go.
Automated Coverage & Mutation Analysis
Diffblue Agents detects your build system, configures coverage and mutation tools automatically, and runs a full analysis in an isolated environment — no manual setup needed.
Receive a full test quality report
Get a breakdown of line coverage, branch coverage, mutation score, and test strength per module — so you can see not just what code is executed by tests, but how well it’s actually verified.
What does Diffblue Test Quality Agent give you?
Line & branch coverage
What your tests execute
Test strength
How good are the tests that you actually have
Mutation score
What your tests actually detect overall
In-depth insights
Pinpoint weak spots instantly
Built for enterprise engineering standards. Available for free.
Prepare for audits, reviews, and modernization initiatives with a report that goes beyond surface-level metrics.
- Automated setup
- Works on Java and Python projects
- Designed for individual developers and large engineering orgs
- Clear outputs suitable for reviews and audits
