react-native-i18n-auto/dist/__tests__/i18n.test.js

Auto i18n tool for React Native with full TypeScript support

"use strict";

var _setup = require("../i18n/setup");
describe('I18n Manager', function () {
  beforeEach(function () {
    // Reset i18n state before each test
    _setup.i18n.clearCache();
    _setup.i18n.setLocales({
      en: {
        HELLO: 'Hello',
        WELCOME: 'Welcome, {name}!',
        NESTED: {
          KEY: 'Nested Value'
        }
      },
      ko: {
        HELLO: '안녕하세요',
        WELCOME: '{name}님 환영합니다!',
        NESTED: {
          KEY: '중첩된 값'
        }
      }
    });
  });
  describe('Basic Translation', function () {
    it('should translate simple keys correctly', function () {
      _setup.i18n.setLanguage('en');
      expect(_setup.i18n.t('HELLO')).toBe('Hello');
      _setup.i18n.setLanguage('ko');
      expect(_setup.i18n.t('HELLO')).toBe('안녕하세요');
    });
    it('should return key if translation is not found', function () {
      _setup.i18n.setLanguage('en');
      expect(_setup.i18n.t('NONEXISTENT_KEY')).toBe('NONEXISTENT_KEY');
    });
  });
  describe('Language Management', function () {
    it('should change language successfully', function () {
      expect(_setup.i18n.setLanguage('en')).toBe(true);
      expect(_setup.i18n.getLanguage()).toBe('en');
      expect(_setup.i18n.setLanguage('ko')).toBe(true);
      expect(_setup.i18n.getLanguage()).toBe('ko');
    });
    it('should fail to change to unsupported language', function () {
      // Explicitly set initial language to en
      _setup.i18n.setLanguage('en');
      expect(_setup.i18n.setLanguage('fr')).toBe(false);
      // Language should remain unchanged
      expect(_setup.i18n.getLanguage()).toBe('en');
    });
    it('should provide list of available languages', function () {
      var languages = _setup.i18n.getAvailableLanguages();
      expect(languages).toHaveLength(2);
      expect(languages).toEqual(expect.arrayContaining([expect.objectContaining({
        code: 'en',
        name: 'English'
      }), expect.objectContaining({
        code: 'ko',
        name: 'Korean'
      })]));
    });
  });
  describe('Cache Management', function () {
    it('should cache translations', function () {
      _setup.i18n.setLanguage('en');
      var key = 'HELLO';

      // First call should cache the result
      expect(_setup.i18n.t(key)).toBe('Hello');

      // Modify internal state (this is for testing only)
      var translations = _setup.i18n.translations;
      translations.en.HELLO = 'Modified Hello';

      // Should still return cached value
      expect(_setup.i18n.t(key)).toBe('Hello');

      // After clearing cache, should return new value
      _setup.i18n.clearCache();
      expect(_setup.i18n.t(key)).toBe('Modified Hello');
    });
    it('should clear cache successfully', function () {
      _setup.i18n.setLanguage('en');
      _setup.i18n.t('HELLO'); // Cache this translation

      _setup.i18n.clearCache();

      // Verify cache is empty
      expect(_setup.i18n.cache).toEqual({});
    });
  });
  describe('Event Handling', function () {
    it('should notify listeners when language changes', function () {
      var listener = jest.fn();
      var unsubscribe = _setup.i18n.onLanguageChange(listener);
      _setup.i18n.setLanguage('ko');
      expect(listener).toHaveBeenCalledTimes(1);
      _setup.i18n.setLanguage('en');
      expect(listener).toHaveBeenCalledTimes(2);

      // Unsubscribe should work
      unsubscribe();
      _setup.i18n.setLanguage('ko');
      expect(listener).toHaveBeenCalledTimes(2);
    });
  });
});