caba89dacc
- Inline <script> in app.html applies saved localStorage theme before first paint to prevent flash of wrong theme - ThemeToggle.svelte: moon/sun button, localStorage persistence, sets data-theme on <html>, defaults to system preference on first visit - Placed in +layout.svelte between language selector and user menu - E2E tests cover visibility, toggle, reverse toggle, persistence, and no-flash behaviour — all 6 passing Refs #64 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
74 lines
2.2 KiB
TypeScript
74 lines
2.2 KiB
TypeScript
import { test, expect } from '@playwright/test';
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test.describe('Theme toggle', () => {
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test.beforeEach(async ({ page }) => {
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// Clear any saved theme preference before each test
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await page.goto('/');
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await page.evaluate(() => localStorage.removeItem('theme'));
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});
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test('toggle button is visible in the header', async ({ page }) => {
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await page.goto('/');
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await expect(
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page.getByRole('banner').getByRole('button', { name: /dark mode|light mode/i })
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).toBeVisible();
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});
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test('clicking the toggle switches to dark mode', async ({ page }) => {
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await page.goto('/');
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await page.waitForSelector('[data-hydrated]');
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const html = page.locator('html');
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await expect(html).not.toHaveAttribute('data-theme', 'dark');
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await page
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.getByRole('banner')
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.getByRole('button', { name: /dark mode/i })
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.click();
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await expect(html).toHaveAttribute('data-theme', 'dark');
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});
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test('clicking the toggle again switches back to light mode', async ({ page }) => {
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await page.goto('/');
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await page.waitForSelector('[data-hydrated]');
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await page
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.getByRole('banner')
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.getByRole('button', { name: /dark mode/i })
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.click();
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await expect(page.locator('html')).toHaveAttribute('data-theme', 'dark');
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await page
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.getByRole('banner')
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.getByRole('button', { name: /light mode/i })
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.click();
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await expect(page.locator('html')).toHaveAttribute('data-theme', 'light');
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});
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test('theme persists after page reload', async ({ page }) => {
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await page.goto('/');
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await page.waitForSelector('[data-hydrated]');
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await page
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.getByRole('banner')
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.getByRole('button', { name: /dark mode/i })
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.click();
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await expect(page.locator('html')).toHaveAttribute('data-theme', 'dark');
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await page.reload();
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await expect(page.locator('html')).toHaveAttribute('data-theme', 'dark');
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});
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test('saved theme is applied before first paint (no flash)', async ({ page }) => {
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// Set dark theme in localStorage before navigating
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await page.goto('/');
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await page.evaluate(() => localStorage.setItem('theme', 'dark'));
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// Intercept the initial HTML to verify data-theme is set immediately
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await page.goto('/');
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const theme = await page.evaluate(() => document.documentElement.getAttribute('data-theme'));
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expect(theme).toBe('dark');
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});
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});
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