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Check regression coverage for added tests - #2748
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Run added and modified Minitest tests with and without a pull request's packaged implementation changes. Informational by default; the
regression-testlabel opts into strict enforcement.Audited the latest 100 pull requests before opening this one (#2747–#2643): 325 tests across 30 pull requests. 34 demonstrated a regression, 41 also passed without the implementation, 248 were inconclusive, and 2 failed on the historical head. All dependency setups completed.
The audit correctly reproduces #2747. It also flags #2710—the change that introduced that regression—as having no added or modified selectable Minitest tests. The 41 passing-on-base cases are review candidates, not confirmed coverage bugs. Most inconclusive cases involve pre-fix boot errors or unavailable APIs.
Includes a resumable
script/regression_check_history.rbaudit command and per-test JSON/log artifacts. The new hosted job, Ruby/Rails test matrix, and CodeQL pass.