visual-testing

Prevent UI regressions by enforcing deterministic visual baselines and running diff-based validation in CI. You capture reference screenshots of critical UI surfaces and automatically compare new runs against them to detect visual drift.

Capture stable screenshots by fixing the viewport size, disabling animations, and seeding data fixtures in Playwright. This deterministic rendering ensures your visual baseline images remain consistent across multiple CI runs.

Visual testing works for web, WASM UIs, component libraries, and desktop apps. It validates visual consistency across critical states and breakpoints using screenshot-based checks within your CI pipelines.

Visual regression tests fail when updating a component library because new styling causes visual drift from the stored baseline images. The diff-based validation surfaces these changes for quick review and rollback if needed.

You need a test runner like Playwright, stable viewport and data fixtures, and baseline management to store reference images. Store reference screenshots in-repo or a review service to compare current visuals against them.

Avoid automated visual testing when you cannot achieve deterministic rendering. If viewport sizes fluctuate, animations cannot be disabled, or data fixtures remain unstable, your screenshot baselines will produce false positives during CI validation.