pantsbuild / pants / 20318360133

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Add [pytest].allow_empty_test_collection option to skip empty test runs (#22948)

Pytest returns exit code 5 when no tests are collected, e.g. when all
tests in a file are deselected via `-k` filtering or excluded via
markers. By default, pants treats this as a test failure.

With `allow_empty_test_collection = true`, exit code 5 is handled by
returning
[TestResult.no_tests_found_in_batch()](https://github.com/pantsbuild/pants/blob/3a34d021c/src/python/pants/core/goals/test.py#L130-L145)
instead, which skips the test run in the summary.

Fixes #22668

12 of 14 new or added lines in 3 files covered. (85.71%)

78498 of 97762 relevant lines covered (80.3%)

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