🐛 fix(discovery): harden subprocess interrogation and test reliability#3054
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…y tests Python interpreter discovery was failing in edge cases where cached metadata became corrupted or subprocess interrogation encountered transient issues. The discovery cache now gracefully handles corrupted entries and subprocess interrogation retries once on failure. Additionally optimized GraalPy test execution by introducing a minimal marker-based test suite that validates core functionality while reducing test count from 1000+ to 30 parametrized cases. Disabled JIT compilation and limited parallelism to 4 workers to prevent resource exhaustion.
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Python interpreter discovery was failing in edge cases where cached metadata became corrupted or subprocess interrogation encountered transient issues. This manifested as
KeyErrorcrashes when loading cached interpreter info and occasional test failures in CI where subprocess calls would timeout or return malformed JSON.The discovery cache now gracefully handles corrupted entries by catching
KeyErrorandTypeErrorwhen deserializing cached data, removing the invalid cache file, and falling back to fresh interrogation. 🔧 Subprocess interrogation also retries once on failure to handle transient issues like process spawning delays or temporary resource exhaustion.Additionally optimized GraalPy test execution by introducing a marker-based test suite (
@pytest.mark.graalpy) that validates core functionality: discovery, venv creation, activation, and integration. This reduces the test count from 1000+ to 30 essential parametrized test cases while maintaining confidence in the core contract.GraalPy runs 4-6x slower than CPython per their documentation, making full test coverage impractical. The optimized suite focuses on high-value tests rather than edge cases and integration combinations. JIT compilation is disabled for GraalPy tests since the suite runs too briefly to benefit from warmup. Parallelism is limited to 4 workers matching GraalPy's own test infrastructure to prevent resource exhaustion.