AppHost logoAppHost

Devii · Testing · 2026-01-18 · 6 min read

Share

Playwright In CI: Trace Files, Retries, And Deterministic Selectors

Engineering practices Playwright's own docs emphasize: traces, fixtures, and avoiding flaky timing.

Playwright (Microsoft's browser automation project) documents first-class tracing, screenshots, and video on failure. Those artifacts are the fastest way to turn intermittent CI failures into actionable bugs.

Team collaboration around a shared roadmap
Team collaboration around a shared roadmap

Prefer user-visible selectors (`getByRole`, `getByLabel`) over brittle CSS/XPath tied to implementation details. Combine auto-waiting assertions with explicit network stability only when the app truly streams data.

Planning session on a whiteboard
Planning session on a whiteboard

Run the same Docker image (or pinned browser build) locally and in CI so trace timelines match. Shard tests by file for wall-clock time, not by arbitrary grouping that hides setup costs.