Playwright Testing for SvelteKit and Svelte 5 Rune Components

This guide provides complete, production-ready Playwright patterns for playwright testing for sveltekit and svelte 5 rune components.

Introduction

Robust test automation requires domain-specific patterns. This article covers playwright testing for sveltekit and svelte 5 rune components 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('SvelteKit server-side rendering works', async ({ page }) => {
  await page.goto('/products');
  // Verify SSR content is present before hydration
  const initialHTML = await page.content();
  expect(initialHTML).toContain('product-list');
  // Verify interactive after hydration
  await page.getByRole('button', { name: 'Add to Cart' }).click();
  await expect(page.getByTestId('cart-count')).toContainText('1');
});

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 SvelteKit form actions with Playwright?

Submit forms and verify that server-side form actions process correctly and return updated data.

How to test Svelte 5 rune reactivity?

Update props or trigger events and verify the reactive state changes are reflected in the DOM.

Can Playwright test SvelteKit streaming SSR?

Yes, verify progressive content loading by checking partial content before the stream completes.

How to test SvelteKit route parameters?

Navigate to dynamic routes like /post/123 and verify the correct data loads for that parameter.

How to test SvelteKit error pages?

Navigate to a non-existent route and verify the +error.svelte page displays correctly.

Summary

This guide covered playwright testing for sveltekit and svelte 5 rune components. Apply these patterns to build reliable, fast, and maintainable automation for this specific scenario.

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