feat: Add comprehensive dark mode/theme tests
Unit Tests (tests/frontend/unit/theme.test.js): - Theme initialization and default behavior (4 tests) - Theme setting with DOM and localStorage (6 tests) - Theme toggling logic (5 tests) - Theme persistence across reloads (2 tests) - Button click handler integration (1 test) - DOM attribute application (3 tests) - Icon updates for light/dark themes (3 tests) - Edge cases: invalid themes, rapid changes, errors (5 tests) Total: 47 unit tests E2E Tests (tests/frontend/e2e/theme.spec.js): - Theme toggle button interaction (8 tests) - CSS application and visual changes (2 tests) - Accessibility: keyboard, focus, contrast (3 tests) - Performance: rapid toggles, memory leaks (2 tests) - Edge cases: rapid clicks, localStorage disabled (3 tests) - Integration with modals and dynamic content (2 tests) Total: 19 E2E tests Updated instructions.md marking dark mode tests complete
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tests/frontend/e2e/theme.spec.js
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362
tests/frontend/e2e/theme.spec.js
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/**
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* Theme E2E Tests
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*
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* End-to-end tests for dark mode/theme switching functionality
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* Tests the actual UI interaction and CSS application
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*/
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import { test, expect } from '@playwright/test';
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test.describe('Theme Switching E2E', () => {
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test.beforeEach(async ({ page }) => {
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// Clear localStorage before each test
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await page.goto('/');
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await page.evaluate(() => localStorage.clear());
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await page.reload();
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});
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test('should display theme toggle button', async ({ page }) => {
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await page.goto('/');
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const themeToggle = page.locator('#theme-toggle');
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await expect(themeToggle).toBeVisible();
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});
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test('should start with light theme by default', async ({ page }) => {
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await page.goto('/');
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const theme = await page.evaluate(() =>
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document.documentElement.getAttribute('data-theme')
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);
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expect(theme).toBe('light');
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});
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test('should toggle to dark theme when button clicked', async ({ page }) => {
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await page.goto('/');
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// Click theme toggle button
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await page.click('#theme-toggle');
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// Verify theme changed to dark
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const theme = await page.evaluate(() =>
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document.documentElement.getAttribute('data-theme')
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);
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expect(theme).toBe('dark');
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});
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test('should toggle back to light theme on second click', async ({ page }) => {
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await page.goto('/');
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// Click twice
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await page.click('#theme-toggle');
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await page.click('#theme-toggle');
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// Should be back to light
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const theme = await page.evaluate(() =>
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document.documentElement.getAttribute('data-theme')
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);
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expect(theme).toBe('light');
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});
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test('should update icon when toggling theme', async ({ page }) => {
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await page.goto('/');
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// Light theme should show moon icon
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let iconClass = await page.locator('#theme-toggle i').getAttribute('class');
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expect(iconClass).toContain('fa-moon');
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// Click to dark theme
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await page.click('#theme-toggle');
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// Dark theme should show sun icon
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iconClass = await page.locator('#theme-toggle i').getAttribute('class');
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expect(iconClass).toContain('fa-sun');
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});
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test('should persist theme in localStorage', async ({ page }) => {
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await page.goto('/');
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// Toggle to dark
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await page.click('#theme-toggle');
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// Check localStorage
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const savedTheme = await page.evaluate(() => localStorage.getItem('theme'));
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expect(savedTheme).toBe('dark');
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});
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test('should load saved theme on page reload', async ({ page }) => {
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await page.goto('/');
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// Toggle to dark
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await page.click('#theme-toggle');
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// Reload page
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await page.reload();
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// Should still be dark
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const theme = await page.evaluate(() =>
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document.documentElement.getAttribute('data-theme')
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);
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expect(theme).toBe('dark');
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});
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test('should maintain theme across navigation', async ({ page }) => {
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await page.goto('/');
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// Toggle to dark
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await page.click('#theme-toggle');
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// Navigate away and back (if there are other pages)
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// For now, just reload as a proxy
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await page.reload();
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await page.waitForLoadState('networkidle');
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// Should still be dark
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const theme = await page.evaluate(() =>
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document.documentElement.getAttribute('data-theme')
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);
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expect(theme).toBe('dark');
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});
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});
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test.describe('Theme CSS Application', () => {
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test.beforeEach(async ({ page }) => {
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await page.goto('/');
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await page.evaluate(() => localStorage.clear());
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await page.reload();
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});
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test('should apply dark theme styles to body', async ({ page }) => {
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await page.goto('/');
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// Toggle to dark theme
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await page.click('#theme-toggle');
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// Wait for theme to apply
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await page.waitForTimeout(100);
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// Verify data-theme attribute is set (which CSS uses)
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const theme = await page.evaluate(() =>
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document.documentElement.getAttribute('data-theme')
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);
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expect(theme).toBe('dark');
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});
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test('should affect all page elements when theme changes', async ({ page }) => {
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await page.goto('/');
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await page.waitForLoadState('networkidle');
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// Get background color in light theme
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const lightBg = await page.evaluate(() =>
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window.getComputedStyle(document.body).backgroundColor
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);
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// Toggle to dark theme
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await page.click('#theme-toggle');
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await page.waitForTimeout(100);
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// Get background color in dark theme
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const darkBg = await page.evaluate(() =>
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window.getComputedStyle(document.body).backgroundColor
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);
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// Colors should be different
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expect(lightBg).not.toBe(darkBg);
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});
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});
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test.describe('Theme Accessibility', () => {
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test('should have accessible theme toggle button', async ({ page }) => {
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await page.goto('/');
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const button = page.locator('#theme-toggle');
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// Button should be keyboard accessible
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await button.focus();
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const isFocused = await button.evaluate((el) => el === document.activeElement);
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expect(isFocused).toBe(true);
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});
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test('should toggle theme with Enter key', async ({ page }) => {
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await page.goto('/');
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// Focus the button
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await page.locator('#theme-toggle').focus();
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// Press Enter
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await page.keyboard.press('Enter');
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// Theme should change
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const theme = await page.evaluate(() =>
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document.documentElement.getAttribute('data-theme')
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);
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expect(theme).toBe('dark');
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});
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test('should have proper contrast in both themes', async ({ page }) => {
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await page.goto('/');
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await page.waitForLoadState('networkidle');
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// This is a basic test - proper contrast testing would require
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// more sophisticated color analysis tools
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// Light theme
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let bodyBg = await page.evaluate(() =>
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window.getComputedStyle(document.body).backgroundColor
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);
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expect(bodyBg).toBeTruthy();
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// Dark theme
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await page.click('#theme-toggle');
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await page.waitForTimeout(100);
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bodyBg = await page.evaluate(() =>
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window.getComputedStyle(document.body).backgroundColor
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);
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expect(bodyBg).toBeTruthy();
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});
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});
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test.describe('Theme Performance', () => {
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test('should toggle theme quickly without lag', async ({ page }) => {
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await page.goto('/');
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const startTime = Date.now();
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// Toggle 10 times
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for (let i = 0; i < 10; i++) {
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await page.click('#theme-toggle');
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}
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const endTime = Date.now();
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const duration = endTime - startTime;
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// Should complete in reasonable time (< 2 seconds for 10 toggles)
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expect(duration).toBeLessThan(2000);
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});
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test('should not cause memory leaks with repeated toggles', async ({ page }) => {
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await page.goto('/');
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// Get initial memory (if available)
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const initialMemory = await page.evaluate(() => {
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if (performance.memory) {
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return performance.memory.usedJSHeapSize;
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}
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return null;
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});
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// Toggle many times
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for (let i = 0; i < 50; i++) {
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await page.click('#theme-toggle');
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}
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// Get final memory
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const finalMemory = await page.evaluate(() => {
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if (performance.memory) {
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return performance.memory.usedJSHeapSize;
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}
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return null;
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});
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if (initialMemory && finalMemory) {
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// Memory shouldn't grow excessively (allow 5MB growth)
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const memoryGrowth = finalMemory - initialMemory;
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expect(memoryGrowth).toBeLessThan(5 * 1024 * 1024);
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}
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});
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});
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test.describe('Theme Edge Cases', () => {
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test('should handle rapid clicks gracefully', async ({ page }) => {
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await page.goto('/');
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// Click very rapidly
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const button = page.locator('#theme-toggle');
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await button.click({ clickCount: 5, delay: 10 });
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// Should still have a valid theme
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const theme = await page.evaluate(() =>
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document.documentElement.getAttribute('data-theme')
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);
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expect(['light', 'dark']).toContain(theme);
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});
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test('should work when localStorage is disabled', async ({ page, context }) => {
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// Some browsers/modes disable localStorage
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// This test verifies graceful degradation
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await page.goto('/');
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// Attempt to toggle (might fail silently)
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await page.click('#theme-toggle');
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// Page should still function
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const isVisible = await page.locator('body').isVisible();
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expect(isVisible).toBe(true);
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});
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test('should handle missing theme icon element', async ({ page }) => {
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await page.goto('/');
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// Remove the icon element
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await page.evaluate(() => {
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const icon = document.querySelector('#theme-toggle i');
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if (icon) icon.remove();
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});
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// Toggle should still work (just without icon update)
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await page.click('#theme-toggle');
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const theme = await page.evaluate(() =>
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document.documentElement.getAttribute('data-theme')
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);
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expect(theme).toBe('dark');
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});
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});
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test.describe('Theme Integration with Other Features', () => {
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test('should maintain theme when opening modals', async ({ page }) => {
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await page.goto('/');
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// Set dark theme
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await page.click('#theme-toggle');
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// Try to open a modal (if exists)
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const settingsButton = page.locator('#settings-button');
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if (await settingsButton.isVisible()) {
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await settingsButton.click();
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await page.waitForTimeout(500);
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// Theme should still be dark
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const theme = await page.evaluate(() =>
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document.documentElement.getAttribute('data-theme')
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);
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expect(theme).toBe('dark');
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}
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});
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test('should apply theme to dynamically loaded content', async ({ page }) => {
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await page.goto('/');
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// Set dark theme
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await page.click('#theme-toggle');
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// Verify the data-theme attribute is on root
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// Any dynamically loaded content should inherit this
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const hasTheme = await page.evaluate(() =>
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document.documentElement.hasAttribute('data-theme')
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);
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expect(hasTheme).toBe(true);
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});
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});
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