34. Cross-Browser Test Matrix & Multi-Core Parallelism

Cross-Browser Parallel Execution

# Run tests across all three browser engines in parallel:
pytest --browser chromium --browser firefox --browser webkit -n auto

Context Isolation

Playwright guarantees each worker process receives a clean, isolated BrowserContext, preventing test contamination.

Task

  • Implement make_browser_cli_args(browsers):
  • 1. Return [arg for b in browsers for arg in ("--browser", b)]
💡Common doubts
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Lesson 34 of 37
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