[andrewpark-scaleai]

Why

The goal is faster agentenv-framework CI with no test weakened. The shard tables are rebuilt from a run's JUnit reports with .github/scripts/slow_test_durations.py, and the script rewrites the table whole. When a run skips a tier, as main's run 43079720062 skipped the installer tier, every unit of that tier drops out of the table. Those shards then balance by the median, not by real times.

What

• The script keeps a file's old seconds when the reports have no test from that file and the file still exists. A deleted file is still dropped. A file that the reports cover still loses tests that were renamed.
• test_a_file_the_reports_have_no_test_of_keeps_its_times fails on main's script and passes with this change.
• test_a_reported_split_file_drops_its_tests_the_reports_dont_have pins the renamed-test behaviour.

Verification

• On run 43079720062's reports, main's script keeps 0 of the 59 installer units, and this one keeps all 59.
• tst/unit/test_slow_test_durations_script.py passes, 5 tests.

Confidence Score: 5/5

The PR appears safe to merge.

Summary

Keeps saved test times for existing files absent from the supplied JUnit reports.

• The duration refresh keeps times for unreported test files that still exist.

No actionable issues found.

_{Reviews (1) · Last reviewed commit: "fix(ci): the durations refresh keeps the..." · Reviewed by Greptile}