Overview
What this challenge is about.
Run PIT against the pricing service to get a baseline mutation score per class. Identify the 5 classes with the largest gap between line coverage and mutation score (these are the 'tested but not really tested' classes). Write targeted JUnit 5 tests to kill at least 30 surviving mutants across those 5 classes — without lowering line coverage anywhere else. Deliver a baseline mutation report, the new test pull request, a final report showing the score lift, and a 2-page recommendation memo on whether to add a mutation-score threshold to CI.
The Brief
What you'll do, and what you'll demonstrate.
Use mutation testing to find the gap between 91 percent line coverage and actual test effectiveness on a pricing service, and close it on the 5 highest-stakes classes.
Earning criteria — what you'll demonstrate
- Distinguish line coverage from semantic test effectiveness via mutation testing
- Read a PIT report and prioritize mutants by business impact
- Write targeted tests that kill mutants without test-suite bloat
- Recommend CI mutation-score thresholds defensibly
Program Fit
Where this fits in your program.
Sharpens the same skills your degree expects you to demonstrate.
Skills
Skills you'll demonstrate.
Each one shows up on your verified credential.
Careers
Roles this prepares you for.
Real titles. Real skill bridges. Pick the one closest to your trajectory.
Career mappings coming soon.