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[ci] Create annotations for failed ctests/gtests in pull requests - #23799
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Fixes root-project#18475 Parse failed test blocks from CTest logs (LastTestsFailed.log and LastTest.log) and emit GitHub Actions ::error annotations mapping failing tests directly to the relevant source file and line (e.g. gtest failures, macro errors, and Python tracebacks in roottest). Exclude Windows to prevent duplicate annotations on test reruns.
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Summary
Fixes #18475.
Problem
When tests fail in CI, developers must scroll through thousands of lines in the CI logs to locate the failure.
Solution
extract_ctest_annotationsandannotate_ctest_failuresinbuild_utils.pyto parse failed test logs (LastTestsFailed.logandLastTest.log).::errorannotations with exact file and line locations for:gtest) failuresroottestroottesttest_annotate_failures.pyand hooked them intotest-ci-scripts.yml.Checklist
python3 test_annotate_failures.pyandtest_null_build_check.py)