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| 1 | +import { get } from 'svelte/store'; |
| 2 | + |
| 3 | +import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'; |
| 4 | + |
| 5 | +import { |
| 6 | + darkMode, |
| 7 | + getNextDarkModePreference, |
| 8 | + useDarkMode, |
| 9 | + useDarkModePreference, |
| 10 | +} from './dark-mode'; |
| 11 | + |
| 12 | +describe('dark-mode utilities', () => { |
| 13 | + let matchMediaMock; |
| 14 | + |
| 15 | + beforeEach(() => { |
| 16 | + matchMediaMock = vi.fn(); |
| 17 | + Object.defineProperty(window, 'matchMedia', { |
| 18 | + writable: true, |
| 19 | + value: matchMediaMock, |
| 20 | + }); |
| 21 | + }); |
| 22 | + |
| 23 | + afterEach(() => { |
| 24 | + vi.restoreAllMocks(); |
| 25 | + }); |
| 26 | + |
| 27 | + describe('useDarkMode', () => { |
| 28 | + it('should return true if prefers-color-scheme is dark and preference is null', () => { |
| 29 | + matchMediaMock.mockReturnValue({ matches: true }); // prefers dark |
| 30 | + useDarkModePreference.set(null); |
| 31 | + const value = get(useDarkMode); |
| 32 | + expect(value).toBe(true); |
| 33 | + }); |
| 34 | + |
| 35 | + it('should return false if prefers-color-scheme is not dark and preference is null', () => { |
| 36 | + matchMediaMock.mockReturnValue({ matches: false }); |
| 37 | + useDarkModePreference.set(null); |
| 38 | + const value = get(useDarkMode); |
| 39 | + expect(value).toBe(false); |
| 40 | + }); |
| 41 | + |
| 42 | + it('should return the user preference if it is set', () => { |
| 43 | + useDarkModePreference.set(true); |
| 44 | + const value1 = get(useDarkMode); |
| 45 | + expect(value1).toBe(true); |
| 46 | + |
| 47 | + useDarkModePreference.set(false); |
| 48 | + const value2 = get(useDarkMode); |
| 49 | + expect(value2).toBe(false); |
| 50 | + }); |
| 51 | + }); |
| 52 | + |
| 53 | + describe('getNextDarkModePreference', () => { |
| 54 | + it('should return true if the current value is null', () => { |
| 55 | + expect(getNextDarkModePreference(null)).toBe(true); |
| 56 | + }); |
| 57 | + |
| 58 | + it('should return false if the current value is true', () => { |
| 59 | + expect(getNextDarkModePreference(true)).toBe(false); |
| 60 | + }); |
| 61 | + |
| 62 | + it('should return null if the current value is false', () => { |
| 63 | + expect(getNextDarkModePreference(false)).toBe(null); |
| 64 | + }); |
| 65 | + }); |
| 66 | + |
| 67 | + describe('darkMode', () => { |
| 68 | + it('should set data-theme to "dark" when dark mode is enabled', async () => { |
| 69 | + const node = document.createElement('div'); |
| 70 | + useDarkModePreference.set(true); |
| 71 | + |
| 72 | + darkMode(node); |
| 73 | + await new Promise((resolve) => setTimeout(resolve, 0)); |
| 74 | + |
| 75 | + expect(node.dataset.theme).toBe('dark'); |
| 76 | + }); |
| 77 | + |
| 78 | + it('should set data-theme to "light" when dark mode is disabled', async () => { |
| 79 | + const node = document.createElement('div'); |
| 80 | + useDarkModePreference.set(false); |
| 81 | + |
| 82 | + darkMode(node); |
| 83 | + await new Promise((resolve) => setTimeout(resolve, 0)); |
| 84 | + |
| 85 | + expect(node.dataset.theme).toBe('light'); |
| 86 | + }); |
| 87 | + }); |
| 88 | +}); |
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