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/unit/theme.test.js
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351
tests/frontend/unit/theme.test.js
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/**
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* Theme/Dark Mode Tests
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*
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* Tests for theme switching functionality in app.js
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* Covers localStorage persistence, DOM attribute changes, and icon updates
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*/
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import { describe, it, expect, beforeEach, afterEach, vi } from 'vitest';
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/**
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* Mock implementation of the theme-related methods from app.js
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* This simulates the actual app behavior for testing
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*/
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class ThemeManager {
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initTheme() {
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const savedTheme = localStorage.getItem('theme') || 'light';
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this.setTheme(savedTheme);
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}
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setTheme(theme) {
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document.documentElement.setAttribute('data-theme', theme);
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localStorage.setItem('theme', theme);
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const themeIcon = document.querySelector('#theme-toggle i');
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if (themeIcon) {
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themeIcon.className = theme === 'light' ? 'fas fa-moon' : 'fas fa-sun';
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}
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}
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toggleTheme() {
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const currentTheme = document.documentElement.getAttribute('data-theme') || 'light';
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const newTheme = currentTheme === 'light' ? 'dark' : 'light';
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this.setTheme(newTheme);
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}
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}
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describe('Theme Management', () => {
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let themeManager;
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beforeEach(() => {
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// Reset DOM
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document.body.innerHTML = `
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<button id="theme-toggle">
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<i class="fas fa-moon"></i>
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</button>
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`;
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document.documentElement.removeAttribute('data-theme');
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// Clear localStorage
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localStorage.clear();
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// Create fresh instance
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themeManager = new ThemeManager();
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});
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afterEach(() => {
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localStorage.clear();
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document.documentElement.removeAttribute('data-theme');
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});
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describe('Theme Initialization', () => {
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it('should initialize with light theme by default when no saved preference', () => {
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themeManager.initTheme();
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expect(document.documentElement.getAttribute('data-theme')).toBe('light');
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expect(localStorage.getItem('theme')).toBe('light');
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});
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it('should load saved theme from localStorage', () => {
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localStorage.setItem('theme', 'dark');
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themeManager.initTheme();
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expect(document.documentElement.getAttribute('data-theme')).toBe('dark');
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});
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it('should update theme icon on initialization', () => {
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localStorage.setItem('theme', 'dark');
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themeManager.initTheme();
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const icon = document.querySelector('#theme-toggle i');
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expect(icon.className).toBe('fas fa-sun');
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});
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it('should handle missing localStorage gracefully', () => {
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// Simulate localStorage not available
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const originalGetItem = Storage.prototype.getItem;
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Storage.prototype.getItem = vi.fn(() => null);
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themeManager.initTheme();
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expect(document.documentElement.getAttribute('data-theme')).toBe('light');
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Storage.prototype.getItem = originalGetItem;
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});
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});
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describe('Theme Setting', () => {
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it('should set light theme correctly', () => {
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themeManager.setTheme('light');
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expect(document.documentElement.getAttribute('data-theme')).toBe('light');
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expect(localStorage.getItem('theme')).toBe('light');
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});
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it('should set dark theme correctly', () => {
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themeManager.setTheme('dark');
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expect(document.documentElement.getAttribute('data-theme')).toBe('dark');
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expect(localStorage.getItem('theme')).toBe('dark');
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});
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it('should update icon to moon for light theme', () => {
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themeManager.setTheme('light');
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const icon = document.querySelector('#theme-toggle i');
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expect(icon.className).toBe('fas fa-moon');
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});
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it('should update icon to sun for dark theme', () => {
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themeManager.setTheme('dark');
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const icon = document.querySelector('#theme-toggle i');
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expect(icon.className).toBe('fas fa-sun');
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});
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it('should persist theme to localStorage', () => {
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themeManager.setTheme('dark');
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expect(localStorage.getItem('theme')).toBe('dark');
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themeManager.setTheme('light');
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expect(localStorage.getItem('theme')).toBe('light');
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});
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it('should handle missing theme icon element gracefully', () => {
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document.body.innerHTML = ''; // Remove theme toggle button
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expect(() => {
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themeManager.setTheme('dark');
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}).not.toThrow();
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expect(document.documentElement.getAttribute('data-theme')).toBe('dark');
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});
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});
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describe('Theme Toggling', () => {
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it('should toggle from light to dark', () => {
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themeManager.setTheme('light');
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themeManager.toggleTheme();
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expect(document.documentElement.getAttribute('data-theme')).toBe('dark');
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expect(localStorage.getItem('theme')).toBe('dark');
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});
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it('should toggle from dark to light', () => {
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themeManager.setTheme('dark');
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themeManager.toggleTheme();
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expect(document.documentElement.getAttribute('data-theme')).toBe('light');
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expect(localStorage.getItem('theme')).toBe('light');
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});
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it('should update icon when toggling', () => {
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themeManager.setTheme('light');
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let icon = document.querySelector('#theme-toggle i');
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expect(icon.className).toBe('fas fa-moon');
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themeManager.toggleTheme();
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icon = document.querySelector('#theme-toggle i');
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expect(icon.className).toBe('fas fa-sun');
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});
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it('should handle multiple toggles correctly', () => {
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themeManager.setTheme('light');
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themeManager.toggleTheme(); // light -> dark
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expect(document.documentElement.getAttribute('data-theme')).toBe('dark');
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themeManager.toggleTheme(); // dark -> light
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expect(document.documentElement.getAttribute('data-theme')).toBe('light');
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themeManager.toggleTheme(); // light -> dark
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expect(document.documentElement.getAttribute('data-theme')).toBe('dark');
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});
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it('should default to light when no theme attribute exists', () => {
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document.documentElement.removeAttribute('data-theme');
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themeManager.toggleTheme();
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expect(document.documentElement.getAttribute('data-theme')).toBe('dark');
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});
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});
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describe('Theme Persistence', () => {
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it('should persist theme across page reloads', () => {
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themeManager.setTheme('dark');
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// Simulate page reload by creating new instance
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const newThemeManager = new ThemeManager();
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newThemeManager.initTheme();
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expect(document.documentElement.getAttribute('data-theme')).toBe('dark');
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});
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it('should maintain theme when toggling multiple times', () => {
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themeManager.initTheme();
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themeManager.toggleTheme();
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themeManager.toggleTheme();
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themeManager.toggleTheme();
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// Should be dark after 3 toggles (light -> dark -> light -> dark)
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expect(localStorage.getItem('theme')).toBe('dark');
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// Reload and verify
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const newThemeManager = new ThemeManager();
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newThemeManager.initTheme();
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expect(document.documentElement.getAttribute('data-theme')).toBe('dark');
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});
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});
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describe('Theme Button Click Handler', () => {
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it('should toggle theme when button is clicked', () => {
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themeManager.initTheme();
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const button = document.getElementById('theme-toggle');
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button.addEventListener('click', () => {
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themeManager.toggleTheme();
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});
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expect(document.documentElement.getAttribute('data-theme')).toBe('light');
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button.click();
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expect(document.documentElement.getAttribute('data-theme')).toBe('dark');
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button.click();
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expect(document.documentElement.getAttribute('data-theme')).toBe('light');
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});
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});
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describe('DOM Attribute Application', () => {
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it('should apply data-theme attribute to document root', () => {
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themeManager.setTheme('dark');
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const root = document.documentElement;
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expect(root.hasAttribute('data-theme')).toBe(true);
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expect(root.getAttribute('data-theme')).toBe('dark');
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});
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it('should update existing data-theme attribute', () => {
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document.documentElement.setAttribute('data-theme', 'light');
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themeManager.setTheme('dark');
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expect(document.documentElement.getAttribute('data-theme')).toBe('dark');
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});
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it('should work with CSS attribute selectors', () => {
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themeManager.setTheme('dark');
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// CSS would use: [data-theme="dark"] { ... }
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const root = document.documentElement;
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const themValue = root.getAttribute('data-theme');
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expect(themValue).toBe('dark');
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});
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});
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describe('Edge Cases', () => {
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it('should handle invalid theme values gracefully', () => {
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themeManager.setTheme('invalid-theme');
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// Should still set the attribute and localStorage
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expect(document.documentElement.getAttribute('data-theme')).toBe('invalid-theme');
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expect(localStorage.getItem('theme')).toBe('invalid-theme');
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});
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it('should handle empty string theme', () => {
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themeManager.setTheme('');
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expect(document.documentElement.getAttribute('data-theme')).toBe('');
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expect(localStorage.getItem('theme')).toBe('');
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});
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it('should handle rapid theme changes', () => {
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for (let i = 0; i < 10; i++) {
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themeManager.toggleTheme();
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}
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// After 10 toggles (even number), should be back to light
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expect(document.documentElement.getAttribute('data-theme')).toBe('light');
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});
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it('should work when localStorage is full', () => {
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// Fill localStorage (though this is hard to truly test)
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const setItemSpy = vi.spyOn(Storage.prototype, 'setItem');
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setItemSpy.mockImplementation(() => {
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throw new Error('QuotaExceededError');
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});
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expect(() => {
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themeManager.setTheme('dark');
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}).toThrow();
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setItemSpy.mockRestore();
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});
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});
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});
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describe('Theme Icon Updates', () => {
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let themeManager;
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beforeEach(() => {
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document.body.innerHTML = `
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<button id="theme-toggle">
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<i class="fas fa-moon"></i>
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</button>
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`;
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localStorage.clear();
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themeManager = new ThemeManager();
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});
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it('should use moon icon for light theme', () => {
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themeManager.setTheme('light');
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const icon = document.querySelector('#theme-toggle i');
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expect(icon.className).toContain('fa-moon');
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expect(icon.className).not.toContain('fa-sun');
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});
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it('should use sun icon for dark theme', () => {
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themeManager.setTheme('dark');
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const icon = document.querySelector('#theme-toggle i');
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expect(icon.className).toContain('fa-sun');
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expect(icon.className).not.toContain('fa-moon');
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});
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it('should update icon class completely (no class accumulation)', () => {
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themeManager.setTheme('light');
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const icon = document.querySelector('#theme-toggle i');
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expect(icon.className).toBe('fas fa-moon');
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themeManager.setTheme('dark');
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expect(icon.className).toBe('fas fa-sun');
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expect(icon.className.split(' ').length).toBe(2); // Only 'fas' and 'fa-sun'
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});
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});
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