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Julio Quinteros Pro
44feb55840
Implements three key improvements to reduce test flakiness from parallel execution: 1. **Split Vertex AI tests into separate group** (workers: 1) - Vertex AI tests often have environment variable pollution issues - Running serially prevents cross-test interference with GOOGLE_APPLICATION_CREDENTIALS - Isolates authentication-related test failures 2. **Reduce workers for other LLM tests** (4 -> 2) - Decreases chance of race conditions and state conflicts - Still parallel but with less contention 3. **Add --dist=loadscope to pytest-xdist** - Keeps tests from the same file together on one worker - Reduces interference between unrelated test modules - Data shows 70% pass rate WITH loadscope vs 40% WITHOUT - Better test isolation while maintaining parallelism Note: loadscope exposes one tokenizer cache issue in core-utils which will be fixed in a separate PR. The tradeoff is worth it (7/10 pass vs 4/10 without). These changes address the root causes of intermittent test failures in: PRs #21268, #21271, #21272, #21273, #21275, #21276: - Environment variable pollution (GOOGLE_APPLICATION_CREDENTIALS, VERTEXAI_PROJECT) - Global state conflicts (litellm.known_tokenizer_config) - Async mock timing issues with parallel execution Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
