a998ef4550
Extract detectLocale() from hooks.server.ts into src/lib/server/locale.ts so it can be tested in isolation. Add 7 unit tests covering: - German, English, Spanish browser preferences - Fallback when primary language is unsupported - Quality value (q=) ordering - Fully unsupported language → null - Empty Accept-Language header → null Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
33 lines
1014 B
TypeScript
33 lines
1014 B
TypeScript
import { describe, expect, it } from 'vitest';
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import { detectLocale } from './locale';
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describe('detectLocale', () => {
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it('returns de for a German browser', () => {
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expect(detectLocale('de-DE,de;q=0.9,en-US;q=0.8,en;q=0.7')).toBe('de');
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});
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it('returns en for an English browser', () => {
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expect(detectLocale('en-US,en;q=0.9')).toBe('en');
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});
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it('returns es for a Spanish browser', () => {
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expect(detectLocale('es-MX,es;q=0.9,en-US;q=0.8')).toBe('es');
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});
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it('falls back to a supported language when the primary is unsupported', () => {
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expect(detectLocale('fr-FR,fr;q=0.9,en;q=0.8')).toBe('en');
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});
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it('respects quality values — picks the highest-priority supported locale', () => {
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expect(detectLocale('en-US;q=0.7,de-DE;q=0.9')).toBe('de');
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});
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it('returns null for a completely unsupported language', () => {
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expect(detectLocale('ja-JP,ja;q=0.9,zh-CN;q=0.8')).toBeNull();
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});
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it('returns null for an empty header', () => {
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expect(detectLocale('')).toBeNull();
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});
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});
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