chore(ci): add Stryker.NET mutation testing for the split math - #36
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- stryker-config.json: mutate SplitIt.Infrastructure/Services/SplitCalculator.cs and run only the SplitCalculator tests (pure, no DB). Thresholds high=80 / low=70 / break=65. - .github/workflows/mutation.yml: runs on PRs touching the calculator, its tests or the config, on a weekly schedule and on demand; fails below break and uploads the report. - SplitCalculatorBoundaryTests: boundary cases (null/empty input, zero total, 0/100 percentages, rounding drift) that raise the mutation score from 69% to 82%.
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Mutation testing (Fase 2.2 — Stryker.NET, SplitIt as the template)
SplitIt's
Domain/Applicationare anemic (DTOs and entities with no logic), so the meaningful, DB-free unit-testable target is theSplitCalculator(expense-splitting math) inInfrastructure/Services. Mutation testing runs there, hermetically (no SQL Server needed).What's added
stryker-config.json— mutatesSplitIt.Infrastructure/Services/SplitCalculator.cs, runs only theSplitCalculator*tests, thresholds high 80 / low 70 / break 65..github/workflows/mutation.yml— runs on PRs touching the calculator, its tests or the config, on a weekly schedule and on demand; fails belowbreakand uploads the HTML/JSON report.SplitCalculatorBoundaryTests.cs— boundary cases (null/empty input, zero total, 0%/100% percentages, rounding-drift absorption) that kill the easy survivors.Result
Mutation score on
SplitCalculator: 69% → 82% (72 killed / 14 survived; the rest are mostly exception-message string mutants). Thebreakthreshold of 65 fails CI on a regression.Follow-ups (not in this PR)