What is the method to inspect and debug tests in Playwright's trace viewer?

Answer

Sure, you can use Playwright's trace viewer to ensure that canvases are rendered correctly. The trace viewer lets you inspect and debug your tests in UI mode.

Inspecting Actions

In the Actions tab, you can see the locator used for each action and the time it took to run. Hover over each action to see the change in the DOM snapshot.

Before and After Tabs

The Before and After tabs let you see what happened before and after an action.

Metadata Tab

The Metadata tab provides more information on your test, like the Browser, viewport size, test duration, and more.

Inspecting the Canvas Element

To inspect the canvas element, click on the pop-out icon above the DOM snapshot to open it in its own window. From there, you can open up DevTools and inspect HTML, CSS, or Console logs.

Comparing Multiple Canvases

If you need to compare multiple canvases on a page or debug them individually, you can do this with Playwright's trace viewer UI mode.

Handling CI Failures

If CI failures occur, it's recommended to use Playwright's trace viewer instead of videos or screenshots. It provides a full trace of your tests as a local Progressive Web App (PWA) that can be easily shared. You can view network requests made during the rendering of canvas elements, which can help identify issues with rendering consistency across different environments or browsers.