Why Your E2E Tests Fail: Playwright's Solution

Your e2e tests sox because you don’t Playwright

Playwright automates visual regression checks, catching issues like missing buttons or broken pages. A single PR can pass all unit tests but still introduce critical UI flaws.

Why This Matters

Manual testing and unit tests often miss visual regressions, which can break user workflows. Playwright addresses this by automating screenshot comparisons and assertions, reducing the cost of undetected bugs in production. Without such tools, teams risk deploying visually broken features despite passing CI checks.

Key Insights

• “Playwright’s toHaveClass assertion for visual checks (2025)”
• “Sagas over ACID for e-commerce”: Not applicable here, but Playwright’s async/await model ensures reliable test execution.
• “Temporal used by Stripe, Coinbase”: Not relevant; Playwright is used by developers for E2E testing.

Working Example

test.describe('Check my Website', () => {
  test('dark mode is fine', async ({ page }) => {
    await page.goto('/');
    await page.click('#dark-mode-switcher');
    await expect(page.locator('body')).toHaveClass('dark');
  });
});

Practical Applications

• Use Case: E-commerce platforms using Playwright to verify UI changes post-deployment.
• Pitfall: Forgetting await in async operations, leading to flaky tests.

References:

• https://dev.to/spo0q/your-e2e-tests-sox-because-you-dont-playwright-3ih3

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