[samtrion]

Problem

With coverage-analysis: perTest, Stryker 5.0.0 (solution mode, MTP runner) captures per-test coverage over the pool-wide set of discovered test assemblies for every mutated project.

Change

stryker-config.json: "coverage-analysis": "perTest" -> "all" (one initial test run per project, covered mutants run against all tests of the project). Same change as dailydevops/extensions.test#1542.

Before / After

Both runs are single workflow_dispatch runs of mutation.yml (before: main, after: this branch), so timing noise of several seconds applies.

metric	before (perTest)	after (all)
Time Elapsed	04:10	03:39
mutation score	93.21 %	95.92 %

Risk

• Measured with one run per side.
• On large solutions all is not safe: in pulse and healthchecks the run finished testing and then failed with OutOfMemoryException while serializing the JSON report; frameshift was cancelled. This repo is small, so it is not affected so far.
• A higher score can mean mutants that perTest wrongly reported as NoCoverage are now tested; it is not necessarily a stronger test suite.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.15%. Comparing base (1326621) to head (f231657).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #448   +/-   ##
=======================================
  Coverage   93.15%   93.15%           
=======================================
  Files          15       15           
  Lines         336      336           
  Branches       99       99           
=======================================
  Hits          313      313           
  Misses         12       12           
  Partials       11       11           

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