e-tib.com/components/layout/Header.test.tsx

import * as React from 'react';
import { describe, it, expect, vi, beforeEach } from 'vitest';
import { render, screen, fireEvent, act, waitFor } from '@testing-library/react';
import { Header, NavLink } from './Header';
import { usePathname } from 'next/navigation';

// Mock next/navigation
vi.mock('next/navigation', () => ({
  usePathname: vi.fn(),
}));

// Mock TransitionLink to render standard anchor tag and forward all props
vi.mock('@/components/ui/TransitionLink', () => ({
  TransitionLink: ({ children, href, onClick, ...props }: any) => (
    <a href={href} onClick={onClick} {...props}>
      {children}
    </a>
  ),
}));

// Mock next/image
vi.mock('next/image', () => ({
  default: ({ src, alt, ...props }: any) => <img src={src} alt={alt} {...props} />,
}));

// Mock LanguageSwitcher
vi.mock('./LanguageSwitcher', () => ({
  LanguageSwitcher: () => <div data-testid="language-switcher" />,
}));

describe('Header Dropdown Navigation TDD', () => {
  const mockNavLinks: NavLink[] = [
    {
      label: 'Home',
      url: '/',
    },
    {
      label: 'Leistungen',
      url: '/leistungen',
      children: [
        { label: 'Kabelbau', url: '/leistungen/kabelbau' },
        { label: 'Bohrtechnik', url: '/leistungen/bohrtechnik' },
      ],
    },
  ];

  beforeEach(() => {
    vi.clearAllMocks();
  });

  it('closes the dropdown menu immediately after a page navigation occurs', async () => {
    // 1. Set initial pathname
    let currentPath = '/de';
    vi.mocked(usePathname).mockImplementation(() => currentPath);

    // 2. Render Header
    const { rerender } = render(<Header navLinks={mockNavLinks} />);

    // 3. Hover over "Leistungen" menu item to open dropdown
    const leistungenNavItem = screen.getByText('Leistungen');
    const navItemContainer = leistungenNavItem.closest('.group');
    expect(navItemContainer).toBeTruthy();

    act(() => {
      fireEvent.mouseEnter(navItemContainer!);
    });

    // 4. Assert dropdown is open and children are rendered
    expect(screen.getByText('Kabelbau')).toBeTruthy();
    expect(screen.getByText('Bohrtechnik')).toBeTruthy();

    // 5. Simulate page navigation by changing the path
    currentPath = '/de/leistungen/kabelbau';
    
    act(() => {
      // Trigger pathname hook change and force rerender
      rerender(<Header navLinks={mockNavLinks} />);
    });

    // 6. Assert dropdown is closed (children are not in the document)
    await waitFor(() => {
      expect(screen.queryByText('Kabelbau')).toBeNull();
      expect(screen.queryByText('Bohrtechnik')).toBeNull();
    });
  });
});