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Playwright parallel execution speeds up CI, but only when tests are isolated by browser context and worker counts match your hardware. Learn how to structure suites and verify isolation.
Vitest users running test suites with threads: true and isolate: false in versions supporting parallel execution may observe non-deterministic test outcomes when suites depend on shared global state. The precise goal is to determine how parallel test processes reconcile module initialization and global variable persistence across worker threads without full
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