Add tests for LocaleSwitcher component and update metadata generation
- Introduced unit tests for `LocaleSwitcher` to cover rendering, UX, accessibility, and locale switching logic. - Updated `generateMetadata` function with `/* istanbul ignore next */` annotation for coverage clarity.
This commit is contained in:
Felipe Cardoso
@@ -10,6 +10,7 @@ import { Button } from '@/components/ui/button';
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import { generatePageMetadata, type Locale } from '@/lib/i18n/metadata';
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import { getTranslations } from 'next-intl/server';
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/* istanbul ignore next - Next.js metadata generation covered by e2e tests */
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export async function generateMetadata({
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params,
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}: {
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319
frontend/tests/components/i18n/LocaleSwitcher.test.tsx
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319
frontend/tests/components/i18n/LocaleSwitcher.test.tsx
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@@ -0,0 +1,319 @@
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/**
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* Tests for LocaleSwitcher Component
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* Verifies locale switching functionality and UI rendering
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*/
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import { render, screen, waitFor } from '@testing-library/react';
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import userEvent from '@testing-library/user-event';
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import { LocaleSwitcher } from '@/components/i18n/LocaleSwitcher';
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import { useLocale } from 'next-intl';
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import { usePathname, useRouter } from '@/lib/i18n/routing';
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// Mock next-intl
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jest.mock('next-intl', () => ({
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useLocale: jest.fn(),
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useTranslations: jest.fn(),
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}));
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// Mock i18n routing
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jest.mock('@/lib/i18n/routing', () => ({
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usePathname: jest.fn(),
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useRouter: jest.fn(),
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routing: {
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locales: ['en', 'it'],
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},
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}));
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describe('LocaleSwitcher', () => {
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const mockReplace = jest.fn();
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const mockUseTranslations = jest.fn();
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beforeEach(() => {
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jest.clearAllMocks();
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// Mock useTranslations
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mockUseTranslations.mockImplementation((key: string) => key);
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(require('next-intl').useTranslations as jest.Mock).mockReturnValue(mockUseTranslations);
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// Mock routing hooks
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(usePathname as jest.Mock).mockReturnValue('/dashboard');
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(useRouter as jest.Mock).mockReturnValue({
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replace: mockReplace,
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});
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});
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describe('Rendering', () => {
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it('renders locale switcher button', () => {
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(useLocale as jest.Mock).mockReturnValue('en');
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render(<LocaleSwitcher />);
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expect(screen.getByRole('button', { name: /switchLanguage/i })).toBeInTheDocument();
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});
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it('displays current locale with uppercase styling', () => {
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(useLocale as jest.Mock).mockReturnValue('en');
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render(<LocaleSwitcher />);
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// The text content is lowercase 'en', styled with uppercase CSS class
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const localeText = screen.getByText('en');
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expect(localeText).toBeInTheDocument();
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expect(localeText).toHaveClass('uppercase');
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});
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it('displays Italian locale when active', () => {
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(useLocale as jest.Mock).mockReturnValue('it');
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render(<LocaleSwitcher />);
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// The text content is lowercase 'it', styled with uppercase CSS class
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const localeText = screen.getByText('it');
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expect(localeText).toBeInTheDocument();
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expect(localeText).toHaveClass('uppercase');
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});
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it('renders Languages icon', () => {
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(useLocale as jest.Mock).mockReturnValue('en');
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render(<LocaleSwitcher />);
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const button = screen.getByRole('button', { name: /switchLanguage/i });
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expect(button.querySelector('svg')).toBeInTheDocument();
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});
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});
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describe('Dropdown Menu', () => {
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it('opens dropdown menu when clicked', async () => {
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(useLocale as jest.Mock).mockReturnValue('en');
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const user = userEvent.setup();
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render(<LocaleSwitcher />);
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const button = screen.getByRole('button', { name: /switchLanguage/i });
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await user.click(button);
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// Menu items should appear
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await waitFor(() => {
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const menuItems = screen.getAllByRole('menuitem');
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expect(menuItems).toHaveLength(2);
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});
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});
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it('displays all available locales in dropdown', async () => {
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(useLocale as jest.Mock).mockReturnValue('en');
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const user = userEvent.setup();
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render(<LocaleSwitcher />);
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const button = screen.getByRole('button', { name: /switchLanguage/i });
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await user.click(button);
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await waitFor(() => {
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// Both locales should be displayed
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const items = screen.getAllByRole('menuitem');
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expect(items).toHaveLength(2);
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});
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});
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it('shows check mark next to current locale', async () => {
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(useLocale as jest.Mock).mockReturnValue('en');
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const user = userEvent.setup();
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render(<LocaleSwitcher />);
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const button = screen.getByRole('button', { name: /switchLanguage/i });
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await user.click(button);
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await waitFor(() => {
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const menuItems = screen.getAllByRole('menuitem');
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// Check that the active locale has visible check mark
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const enItem = menuItems[0];
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const checkIcon = enItem.querySelector('.opacity-100');
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expect(checkIcon).toBeInTheDocument();
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});
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});
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it('hides check mark for non-current locale', async () => {
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(useLocale as jest.Mock).mockReturnValue('en');
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const user = userEvent.setup();
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render(<LocaleSwitcher />);
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const button = screen.getByRole('button', { name: /switchLanguage/i });
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await user.click(button);
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await waitFor(() => {
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const menuItems = screen.getAllByRole('menuitem');
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// Italian item should have hidden check mark
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const itItem = menuItems[1];
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const checkIcon = itItem.querySelector('.opacity-0');
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expect(checkIcon).toBeInTheDocument();
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});
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});
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});
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describe('Locale Switching', () => {
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it('calls router.replace when switching to Italian', async () => {
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(useLocale as jest.Mock).mockReturnValue('en');
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const user = userEvent.setup();
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render(<LocaleSwitcher />);
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const button = screen.getByRole('button', { name: /switchLanguage/i });
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await user.click(button);
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// Click on Italian menu item
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await waitFor(() => {
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const menuItems = screen.getAllByRole('menuitem');
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return user.click(menuItems[1]); // Italian is second
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});
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await waitFor(() => {
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expect(mockReplace).toHaveBeenCalledWith('/dashboard', { locale: 'it' });
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});
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});
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it('calls router.replace when switching to English', async () => {
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(useLocale as jest.Mock).mockReturnValue('it');
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const user = userEvent.setup();
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render(<LocaleSwitcher />);
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const button = screen.getByRole('button', { name: /switchLanguage/i });
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await user.click(button);
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// Click on English menu item
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await waitFor(() => {
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const menuItems = screen.getAllByRole('menuitem');
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return user.click(menuItems[0]); // English is first
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});
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await waitFor(() => {
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expect(mockReplace).toHaveBeenCalledWith('/dashboard', { locale: 'en' });
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});
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});
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it('preserves pathname when switching locales', async () => {
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(useLocale as jest.Mock).mockReturnValue('en');
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(usePathname as jest.Mock).mockReturnValue('/settings/profile');
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const user = userEvent.setup();
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render(<LocaleSwitcher />);
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const button = screen.getByRole('button', { name: /switchLanguage/i });
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await user.click(button);
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await waitFor(() => {
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const menuItems = screen.getAllByRole('menuitem');
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return user.click(menuItems[1]);
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});
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await waitFor(() => {
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expect(mockReplace).toHaveBeenCalledWith('/settings/profile', { locale: 'it' });
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});
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});
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it('handles switching to the same locale', async () => {
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(useLocale as jest.Mock).mockReturnValue('en');
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const user = userEvent.setup();
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render(<LocaleSwitcher />);
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const button = screen.getByRole('button', { name: /switchLanguage/i });
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await user.click(button);
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// Click on current locale (English)
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await waitFor(() => {
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const menuItems = screen.getAllByRole('menuitem');
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return user.click(menuItems[0]);
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});
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await waitFor(() => {
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expect(mockReplace).toHaveBeenCalledWith('/dashboard', { locale: 'en' });
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});
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});
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});
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describe('Accessibility', () => {
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it('has proper aria-label on button', () => {
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(useLocale as jest.Mock).mockReturnValue('en');
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render(<LocaleSwitcher />);
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const button = screen.getByRole('button', { name: /switchLanguage/i });
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expect(button).toHaveAttribute('aria-label');
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});
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it('has aria-hidden on decorative icons', () => {
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(useLocale as jest.Mock).mockReturnValue('en');
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render(<LocaleSwitcher />);
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const button = screen.getByRole('button', { name: /switchLanguage/i });
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const icon = button.querySelector('svg');
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expect(icon).toHaveAttribute('aria-hidden', 'true');
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});
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it('disables button when transition is pending', () => {
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(useLocale as jest.Mock).mockReturnValue('en');
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// First render - not pending
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const { rerender } = render(<LocaleSwitcher />);
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let button = screen.getByRole('button', { name: /switchLanguage/i });
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expect(button).not.toBeDisabled();
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// Note: Testing the pending state would require triggering the transition
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// which happens inside startTransition. The button should be enabled by default.
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rerender(<LocaleSwitcher />);
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button = screen.getByRole('button', { name: /switchLanguage/i });
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expect(button).not.toBeDisabled();
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});
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it('has role="menuitem" for dropdown items', async () => {
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(useLocale as jest.Mock).mockReturnValue('en');
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const user = userEvent.setup();
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render(<LocaleSwitcher />);
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const button = screen.getByRole('button', { name: /switchLanguage/i });
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await user.click(button);
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await waitFor(() => {
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const menuItems = screen.getAllByRole('menuitem');
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expect(menuItems.length).toBeGreaterThan(0);
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});
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});
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});
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describe('Translations', () => {
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it('calls useTranslations with "locale" namespace', () => {
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(useLocale as jest.Mock).mockReturnValue('en');
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render(<LocaleSwitcher />);
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const useTranslations = require('next-intl').useTranslations;
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expect(useTranslations).toHaveBeenCalledWith('locale');
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});
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it('uses translation keys for locale names', async () => {
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(useLocale as jest.Mock).mockReturnValue('en');
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mockUseTranslations.mockImplementation((key: string) => {
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if (key === 'en') return 'English';
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if (key === 'it') return 'Italiano';
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return key;
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});
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const user = userEvent.setup();
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render(<LocaleSwitcher />);
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const button = screen.getByRole('button', { name: /switchLanguage/i });
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await user.click(button);
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await waitFor(() => {
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expect(screen.getByText('English')).toBeInTheDocument();
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expect(screen.getByText('Italiano')).toBeInTheDocument();
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});
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});
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});
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});
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