Playwright Testing for WebGL and 3D Canvas Applications

This guide provides complete, production-ready Playwright patterns for playwright testing for webgl and 3d canvas applications.

Introduction

Robust test automation requires domain-specific patterns. This article covers playwright testing for webgl and 3d canvas applications with practical code examples you can use immediately in your test suite.

Architecture Overview

graph TD
    Test["Playwright Test"] --> App["Application Under Test"]
    App --> API["Backend API / Mock"]
    API --> Assert["Test Assertions Pass"]

Implementation

test('Three.js scene renders without errors', async ({ page }) => {
  const errors: string[] = [];
  page.on('pageerror', err => errors.push(err.message));
  page.on('console', msg => {
    if (msg.type() === 'error') errors.push(msg.text());
  });
  await page.goto('/3d-viewer');
  await page.waitForFunction(() => window.__sceneReady === true, { timeout: 15000 });
  expect(errors.filter(e => e.includes('WebGL'))).toHaveLength(0);
  const canvas = page.locator('canvas');
  await expect(canvas).toBeVisible();
  await expect(canvas).toHaveScreenshot('3d-scene.png');
});

Run Tests

npx playwright test --grep "Playwright Testing for"
npx playwright test --ui

Reference Table

Best Practices

Common Mistakes

Frequently Asked Questions

How to test Three.js applications with Playwright?

Wait for the scene to initialize, check for WebGL errors in console, and take visual regression screenshots.

Can Playwright interact with 3D scenes?

Use mouse drag events to test camera rotation and zoom controls in interactive 3D viewers.

How to test WebGL context creation failure?

Override WebGLRenderingContext in page.evaluate() to return null and verify the fallback UI appears.

How to test 3D model loading?

Monitor network requests for .glb or .obj files and verify the model appears after load completes.

How to do visual regression for 3D scenes?

Take screenshots of the canvas element and compare with baseline, using a pixel tolerance for rendering variance.

Summary

This guide covered playwright testing for webgl and 3d canvas applications. Apply these patterns to build reliable, fast, and maintainable automation for this specific scenario.

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