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Johnathan Corgan da9a12a3dd Surface unit tests that passed only on retry
The ci nextest profile retries a failing test twice, so a test that
fails and then passes leaves the job green, with the retry visible only
as "(1 flaky)" in the summary line and a FLAKY line in the log. Recent
macOS runs have carried such flakes unnoticed. The Linux job's two junit
reporters ignore nextest's <flakyFailure> elements, and the macOS and
Windows jobs have no reporter, so no job surfaced them.

testing/check-nextest-flaky.sh reads the ci profile's JUnit report and
emits a warning annotation and a step-summary line for each test that
passed only on retry. It exits 0 so a flake does not red the run, and 2
when there is no report to read. Each of the three unit-test jobs runs
it after nextest, on success or failure but not on a cancelled run.
Fixture tests over recorded nextest reports (clean, flaky, and a test
that failed every attempt) run in local CI and in the GitHub CI parity
job.

The unit-test jobs cache the whole target directory, so a restored
target/nextest/ci/junit.xml from an earlier run could sit where the check
reads and hide a run that failed before writing one. Delete the report
before nextest runs.
2026-10-01 14:20:06 +00:00
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