[samtrion]

Problem

stryker-config.json sets thresholds high 90 / low 80 / break 0. The latest scheduled mutation run (run 40488214820) ends with The final mutation score is 59.95 % and is green. break: 0 means the score could drop to 1% and the run would still pass, so there is no regression gate. The score is also permanently below low, so the dashboard badge and log colouring are always red.

Root cause

The thresholds are aspirational values that were never ratcheted to the real baseline.

Change

Only stryker-config.json (the file used by the scheduled run and the workflow_dispatch default): high 90 -> 75, low 80 -> 60, break 0 -> 55. break is deliberately a few points below the measured 59.95% because the score varies between runs. The three stryker-config.roslyn*.json files are untouched: they only run via manual dispatch with an explicit configurationFile and have no measured baseline.

Before / After

metric	before	after
thresholds (high/low/break)	90 / 80 / 0	75 / 60 / 55
mutation score	59.95% (2110 mutants created)	59.95% (2110 mutants created, identical; config-only change)
run result	green, no gate (break 0)	green with break 55: https://github.com/dailydevops/analyzer/actions/runs/40815416914
gate proof (throwaway branch, break 65)	n/a	run failed with Final mutation score is below threshold break. Crashing...: https://github.com/dailydevops/analyzer/actions/runs/40818066383

Note: Stryker rejects configs where low < break; the first gate-proof attempt (low 60, break 70) failed at config validation, so it was repeated with low 65 / break 65.

Risk / what this does not change

• A score below 55% now fails the scheduled run (intended).
• Scores were measured before the other mutation findings land; break should be raised as the score improves.
• Does not improve the score itself.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.72%. Comparing base (8c86c2b) to head (64dc318).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #231   +/-   ##
=======================================
  Coverage   94.72%   94.72%           
=======================================
  Files          48       48           
  Lines        2557     2557           
  Branches      449      449           
=======================================
  Hits         2422     2422           
  Misses         58       58           
  Partials       77       77           

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