i18n-schema.test.ts•2.95 kB
import {
isValidLanguage,
getSafeLanguage,
type Language,
} from '../../../src/v2/i18n-schema.js'; // 相対パスに変更
describe('i18n Schema Utilities', () => {
describe('isValidLanguage', () => {
it('should return true for supported languages', () => {
expect(isValidLanguage('en')).toBe(true);
expect(isValidLanguage('ja')).toBe(true);
expect(isValidLanguage('zh')).toBe(true);
});
it('should return false for unsupported languages', () => {
expect(isValidLanguage('fr')).toBe(false);
expect(isValidLanguage('EN')).toBe(false); // Case-sensitive
expect(isValidLanguage(' ja ')).toBe(false); // Needs exact match
expect(isValidLanguage('')).toBe(false);
});
it('should return false for non-string inputs', () => {
expect(isValidLanguage(undefined as any)).toBe(false);
expect(isValidLanguage(null as any)).toBe(false);
expect(isValidLanguage(123 as any)).toBe(false);
expect(isValidLanguage({} as any)).toBe(false);
});
// Type guard test
it('should narrow the type for known languages', () => {
const lang: string = 'ja';
if (isValidLanguage(lang)) {
// If this compiles, the type guard works
const knownLang: Language = lang;
expect(knownLang).toBe('ja');
} else {
fail('Type guard failed for known language');
}
});
});
describe('getSafeLanguage', () => {
it('should return the same language if it is supported', () => {
expect(getSafeLanguage('en')).toBe('en');
expect(getSafeLanguage('ja')).toBe('ja');
expect(getSafeLanguage('zh')).toBe('zh');
});
it('should return "en" (default) for unsupported languages', () => {
expect(getSafeLanguage('fr')).toBe('en');
expect(getSafeLanguage('JA')).toBe('en'); // Case-sensitive check from isValidLanguage
expect(getSafeLanguage('')).toBe('en');
});
it('should return "en" for non-string inputs', () => {
expect(getSafeLanguage(undefined as any)).toBe('en');
expect(getSafeLanguage(null as any)).toBe('en');
expect(getSafeLanguage(123 as any)).toBe('en');
expect(getSafeLanguage({} as any)).toBe('en');
});
});
// Placeholder for potential future tests on TranslationFile structure if needed
// describe('TranslationFile Structure (Type Check)', () => {
// it('should conform to the TranslationFile interface', () => {
// const validFile: TranslationFile = {
// language: 'en',
// translations: {
// greeting: 'Hello',
// farewell: 'Goodbye',
// },
// metadata: {
// version: '1.0.0',
// updatedAt: new Date().toISOString(),
// },
// };
// // Basic check to ensure the structure is assignable
// expect(validFile.language).toBe('en');
// expect(validFile.translations.greeting).toBe('Hello');
// });
// });
});