Ditching Selenium for Playwright + Pytest: What We Gained (and Why We Never Looked Back)

说明与用途

将 Selenium 换成 Playwright + Pytest，缩短回归时间，降低 flaky，借助自动等待、并行执行和内置跟踪加速调试。

问题

Flaky failures, slow CI pipelines, and painful debugging plagued a Selenium‑based E2E suite for a data‑heavy enterprise web app.

结果

Switching to Playwright reduced regression time by 42%, flaky failures by 71%, and debugging effort by 75%.

工作流

• 1. Replace Selenium with Playwright + pytest via pytest‑playwright plugin.
• 2. Remove hard‑coded Thread.sleep calls; rely on Playwright auto‑waits.
• 3. Configure pytest‑xdist for parallel runs (-n auto).
• 4. Enable tracing, video, screenshot on failure in pytest.ini.
• 5. Structure framework with Page Object Model, components, data factories, utils.
• 6. Write tests that use page objects and expect assertions.
• 7. Run tests locally with --headed --slowmo for debugging, view trace with playwright show-trace.

证据

Regression time went from ~6 hours to ~3.5, and the flaky rate went from ~35% to ~10%.

来源

Playwright controls browsers through a protocol connection ... It sees what the browser is doing and checks that an element is attached, visible, stable, enabled, and able to receive events before it acts.

来源

With pytest‑xdist, tests run concurrently, and full regression time dropped from ~6 hours to ~3.5 hours.

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