Add comprehensive tests for i18n routes and fix route ordering
- Add 19 integration tests for i18n API routes with 100% coverage - Fix Express route ordering: specific routes (/detect) before parameterized routes (/:locale) - Test all endpoints: locale translations, available locales, locale detection - Test error cases: unsupported locales, missing translations, malformed headers - Test HTTP caching headers and content-type validation - Include i18n routes in coverage collection (was previously excluded) Coverage improvement: 147 tests total (+19), 79.9% statements (+1.2%) 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
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3 changed files with 353 additions and 32 deletions
322
tests/integration/routes/i18n.test.ts
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tests/integration/routes/i18n.test.ts
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import request from 'supertest';
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import express from 'express';
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import { createI18nRoutes } from '../../../src/routes/i18n';
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import { i18nService } from '../../../src/i18n';
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// Mock the i18n service
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jest.mock('../../../src/i18n', () => ({
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i18nService: {
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isLocaleSupported: jest.fn(),
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getAvailableLocales: jest.fn(),
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getTranslations: jest.fn(),
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getDefaultLocale: jest.fn(),
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getLocaleDisplayName: jest.fn(),
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detectLocale: jest.fn()
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}
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}));
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const mockI18nService = i18nService as jest.Mocked<typeof i18nService>;
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describe('I18n API Routes', () => {
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let app: express.Application;
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beforeEach(() => {
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app = express();
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app.use('/api/i18n', createI18nRoutes());
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// Reset mocks
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jest.clearAllMocks();
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// Default mock implementations
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mockI18nService.getAvailableLocales.mockReturnValue(['en', 'es-MX']);
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mockI18nService.getDefaultLocale.mockReturnValue('en');
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mockI18nService.getLocaleDisplayName.mockImplementation((locale: string) => {
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const names: Record<string, string> = {
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'en': 'English',
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'es-MX': 'Español (México)'
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};
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return names[locale] || locale;
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});
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});
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describe('GET /api/i18n/:locale', () => {
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const mockTranslations = {
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common: {
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appName: 'Great Lakes Ice Report',
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submit: 'Submit',
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cancel: 'Cancel'
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},
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pages: {
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home: {
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title: 'Ice Report',
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subtitle: 'Community winter road conditions'
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}
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}
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};
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it('should return translations for a supported locale', async () => {
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mockI18nService.isLocaleSupported.mockReturnValue(true);
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mockI18nService.getTranslations.mockReturnValue(mockTranslations);
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const response = await request(app)
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.get('/api/i18n/en')
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.expect(200);
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expect(response.headers['cache-control']).toBe('public, max-age=3600');
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expect(response.headers['content-type']).toMatch(/application\/json/);
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expect(response.body).toEqual(mockTranslations);
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expect(mockI18nService.isLocaleSupported).toHaveBeenCalledWith('en');
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expect(mockI18nService.getTranslations).toHaveBeenCalledWith('en');
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});
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it('should return translations for Spanish locale', async () => {
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const spanishTranslations = {
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common: {
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appName: 'Reporte de Hielo de los Grandes Lagos',
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submit: 'Enviar',
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cancel: 'Cancelar'
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}
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};
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mockI18nService.isLocaleSupported.mockReturnValue(true);
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mockI18nService.getTranslations.mockReturnValue(spanishTranslations);
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const response = await request(app)
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.get('/api/i18n/es-MX')
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.expect(200);
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expect(response.body).toEqual(spanishTranslations);
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expect(mockI18nService.isLocaleSupported).toHaveBeenCalledWith('es-MX');
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expect(mockI18nService.getTranslations).toHaveBeenCalledWith('es-MX');
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});
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it('should reject unsupported locale', async () => {
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mockI18nService.isLocaleSupported.mockReturnValue(false);
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const response = await request(app)
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.get('/api/i18n/fr')
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.expect(400);
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expect(response.body).toEqual({
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error: 'Unsupported locale',
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supportedLocales: ['en', 'es-MX']
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});
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expect(mockI18nService.isLocaleSupported).toHaveBeenCalledWith('fr');
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expect(mockI18nService.getAvailableLocales).toHaveBeenCalled();
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expect(mockI18nService.getTranslations).not.toHaveBeenCalled();
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});
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it('should handle missing translations for supported locale', async () => {
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mockI18nService.isLocaleSupported.mockReturnValue(true);
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mockI18nService.getTranslations.mockReturnValue(null);
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const response = await request(app)
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.get('/api/i18n/en')
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.expect(404);
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expect(response.body).toEqual({
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error: 'Translations not found for locale',
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locale: 'en'
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});
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expect(mockI18nService.getTranslations).toHaveBeenCalledWith('en');
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});
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it('should handle special characters in locale parameter', async () => {
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mockI18nService.isLocaleSupported.mockReturnValue(false);
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await request(app)
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.get('/api/i18n/en-US@currency=USD')
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.expect(400);
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expect(mockI18nService.isLocaleSupported).toHaveBeenCalledWith('en-US@currency=USD');
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});
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it('should handle empty locale parameter', async () => {
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mockI18nService.isLocaleSupported.mockReturnValue(false);
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await request(app)
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.get('/api/i18n/')
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.expect(200); // This will hit the GET / route instead
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expect(mockI18nService.isLocaleSupported).not.toHaveBeenCalled();
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});
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});
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describe('GET /api/i18n', () => {
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it('should return available locales with display names', async () => {
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const response = await request(app)
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.get('/api/i18n')
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.expect(200);
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expect(response.body).toEqual({
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default: 'en',
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available: [
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{ code: 'en', name: 'English' },
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{ code: 'es-MX', name: 'Español (México)' }
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]
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});
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expect(mockI18nService.getAvailableLocales).toHaveBeenCalled();
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expect(mockI18nService.getDefaultLocale).toHaveBeenCalled();
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expect(mockI18nService.getLocaleDisplayName).toHaveBeenCalledWith('en');
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expect(mockI18nService.getLocaleDisplayName).toHaveBeenCalledWith('es-MX');
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});
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it('should handle empty available locales', async () => {
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mockI18nService.getAvailableLocales.mockReturnValue([]);
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const response = await request(app)
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.get('/api/i18n')
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.expect(200);
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expect(response.body).toEqual({
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default: 'en',
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available: []
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});
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});
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it('should handle missing display names gracefully', async () => {
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mockI18nService.getAvailableLocales.mockReturnValue(['unknown']);
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mockI18nService.getLocaleDisplayName.mockReturnValue('unknown');
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const response = await request(app)
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.get('/api/i18n')
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.expect(200);
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expect(response.body.available).toEqual([
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{ code: 'unknown', name: 'unknown' }
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]);
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});
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});
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describe('GET /api/i18n/detect', () => {
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it('should detect locale from Accept-Language header', async () => {
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mockI18nService.detectLocale.mockReturnValue('es-MX');
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const response = await request(app)
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.get('/api/i18n/detect')
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.set('Accept-Language', 'es-MX,es;q=0.9,en;q=0.8')
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.expect(200);
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expect(response.body).toEqual({
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detected: 'es-MX',
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displayName: 'Español (México)'
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});
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expect(mockI18nService.detectLocale).toHaveBeenCalledWith('es-MX,es;q=0.9,en;q=0.8');
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expect(mockI18nService.getLocaleDisplayName).toHaveBeenCalledWith('es-MX');
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});
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it('should handle missing Accept-Language header', async () => {
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mockI18nService.detectLocale.mockReturnValue('en');
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const response = await request(app)
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.get('/api/i18n/detect')
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.expect(200);
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expect(response.body).toEqual({
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detected: 'en',
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displayName: 'English'
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});
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expect(mockI18nService.detectLocale).toHaveBeenCalledWith(undefined);
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});
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it('should handle complex Accept-Language header', async () => {
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mockI18nService.detectLocale.mockReturnValue('en');
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const response = await request(app)
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.get('/api/i18n/detect')
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.set('Accept-Language', 'fr-FR,fr;q=0.9,en-US;q=0.8,en;q=0.7,*;q=0.5')
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.expect(200);
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expect(response.body.detected).toBe('en');
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expect(mockI18nService.detectLocale).toHaveBeenCalledWith('fr-FR,fr;q=0.9,en-US;q=0.8,en;q=0.7,*;q=0.5');
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});
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it('should handle malformed Accept-Language header', async () => {
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mockI18nService.detectLocale.mockReturnValue('en');
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const response = await request(app)
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.get('/api/i18n/detect')
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.set('Accept-Language', 'invalid;;;malformed,,,')
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.expect(200);
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expect(response.body.detected).toBe('en');
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expect(mockI18nService.detectLocale).toHaveBeenCalledWith('invalid;;;malformed,,,');
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});
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it('should handle empty Accept-Language header', async () => {
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mockI18nService.detectLocale.mockReturnValue('en');
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const response = await request(app)
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.get('/api/i18n/detect')
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.set('Accept-Language', '')
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.expect(200);
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expect(response.body.detected).toBe('en');
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expect(mockI18nService.detectLocale).toHaveBeenCalledWith('');
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});
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});
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describe('Route ordering and conflicts', () => {
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it('should prioritize specific routes over detect route', async () => {
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// Test that /api/i18n/detect doesn't conflict with /api/i18n/:locale
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mockI18nService.detectLocale.mockReturnValue('en');
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const response = await request(app)
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.get('/api/i18n/detect')
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.expect(200);
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expect(response.body).toHaveProperty('detected');
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expect(response.body).toHaveProperty('displayName');
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expect(mockI18nService.detectLocale).toHaveBeenCalled();
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});
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it('should handle locale named "detect" correctly', async () => {
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// This should NOT call the detect endpoint
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mockI18nService.isLocaleSupported.mockReturnValue(false);
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await request(app)
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.get('/api/i18n/detect')
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.expect(200); // This hits the detect route, not the locale route
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expect(mockI18nService.isLocaleSupported).not.toHaveBeenCalled();
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expect(mockI18nService.detectLocale).toHaveBeenCalled();
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});
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});
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describe('HTTP headers and content type', () => {
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it('should set correct content-type for translations', async () => {
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mockI18nService.isLocaleSupported.mockReturnValue(true);
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mockI18nService.getTranslations.mockReturnValue({ test: 'data' });
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const response = await request(app)
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.get('/api/i18n/en')
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.expect(200);
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expect(response.headers['content-type']).toMatch(/application\/json/);
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});
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it('should set cache headers for translations', async () => {
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mockI18nService.isLocaleSupported.mockReturnValue(true);
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mockI18nService.getTranslations.mockReturnValue({ test: 'data' });
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const response = await request(app)
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.get('/api/i18n/en')
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.expect(200);
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expect(response.headers['cache-control']).toBe('public, max-age=3600');
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});
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it('should not set cache headers for error responses', async () => {
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mockI18nService.isLocaleSupported.mockReturnValue(false);
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const response = await request(app)
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.get('/api/i18n/invalid')
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.expect(400);
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expect(response.headers['cache-control']).toBeUndefined();
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});
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});
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});
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