87 lines
2.7 KiB
TypeScript
87 lines
2.7 KiB
TypeScript
// @vitest-environment jsdom
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import { describe, it, expect, beforeEach, vi, afterEach } from 'vitest';
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import { THEME_INIT_SCRIPT } from '../themeScript';
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/**
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* The inline script that sets the colour mode before the first paint (T-10).
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* Without it a visitor who stored "light" — or runs a light OS under
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* `mode: auto` — saw the server's dark guess until ThemeToggle's bundle ran.
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*/
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let osLight = false;
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function run(defaultTheme: string | null, serverTheme: string | null = defaultTheme) {
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const html = document.documentElement;
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html.removeAttribute('data-theme');
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html.removeAttribute('data-default-theme');
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if (defaultTheme !== null) html.setAttribute('data-default-theme', defaultTheme);
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if (serverTheme !== null && serverTheme !== 'auto') html.setAttribute('data-theme', serverTheme);
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new Function(THEME_INIT_SCRIPT)();
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return html.getAttribute('data-theme');
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}
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// Node 26 defines its own global localStorage (undefined without
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// --localstorage-file), which shadows jsdom's; a Map-backed stub stands in.
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function stubStorage() {
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const store = new Map<string, string>();
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vi.stubGlobal('localStorage', {
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getItem: (k: string) => store.get(k) ?? null,
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setItem: (k: string, v: string) => void store.set(k, v),
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});
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}
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beforeEach(() => {
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osLight = false;
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stubStorage();
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vi.stubGlobal('matchMedia', (query: string) => ({
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media: query,
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matches: query === '(prefers-color-scheme: light)' ? osLight : false,
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}));
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});
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afterEach(() => {
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vi.unstubAllGlobals();
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vi.restoreAllMocks();
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});
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describe('THEME_INIT_SCRIPT', () => {
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it('applies a stored choice over the configured mode', () => {
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localStorage.setItem('theme', 'light');
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expect(run('dark')).toBe('light');
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localStorage.setItem('theme', 'dark');
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expect(run('light')).toBe('dark');
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});
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it('keeps the configured mode for a visitor who never chose', () => {
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expect(run('light')).toBe('light');
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expect(run('dark')).toBe('dark');
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});
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it('follows the OS under mode: auto', () => {
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osLight = true;
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expect(run('auto')).toBe('light');
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osLight = false;
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expect(run('auto')).toBe('dark');
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});
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it('ignores a stored value that is not a mode', () => {
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localStorage.setItem('theme', 'purple');
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osLight = true;
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expect(run('auto')).toBe('light');
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});
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it('falls back to the configured mode when storage throws', () => {
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vi.stubGlobal('localStorage', {
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getItem: () => {
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throw new Error('SecurityError');
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},
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});
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expect(run('light')).toBe('light');
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});
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/** It is inlined as a string: a `</script>` inside would end it early. */
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it('is safe to inline', () => {
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expect(THEME_INIT_SCRIPT).not.toMatch(/<\/script/i);
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});
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});
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