grafana/public/app/core/components/Breadcrumbs/Breadcrumbs.test.tsx

import { render, screen, within } from '@testing-library/react';
import React from 'react';

import { Breadcrumbs } from './Breadcrumbs';
import { Breadcrumb } from './types';

const mockBreadcrumbs: Breadcrumb[] = [
  { text: 'Home', href: '/home' },
  { text: 'First', href: '/first' },
  { text: 'Second', href: '/second' },
];

describe('Breadcrumbs', () => {
  it('should render without error', () => {
    expect(() => render(<Breadcrumbs breadcrumbs={[]} />)).not.toThrow();
  });

  it('should render a <nav> element', () => {
    render(<Breadcrumbs breadcrumbs={[]} />);
    expect(screen.getByRole('navigation')).toBeInTheDocument();
  });

  it('should render links for each breadcrumb except the last', () => {
    render(<Breadcrumbs breadcrumbs={mockBreadcrumbs} />);
    const nav = screen.getByRole('navigation');
    const links = within(nav).getAllByRole('link');
    expect(links.length).toEqual(2);
    const homeLink = within(nav).getByRole('link', { name: 'Home' });
    expect(homeLink).toBeInTheDocument();
    expect(homeLink).toHaveAttribute('href', '/home');
    const firstLink = within(nav).getByRole('link', { name: 'First' });
    expect(firstLink).toBeInTheDocument();
    expect(firstLink).toHaveAttribute('href', '/first');
  });

  it('should render the last breadcrumb as text and set the correct aria-current attribute', () => {
    render(<Breadcrumbs breadcrumbs={mockBreadcrumbs} />);
    const nav = screen.getByRole('navigation');
    expect(within(nav).queryByRole('link', { name: 'Second' })).not.toBeInTheDocument();
    expect(within(nav).getByText('Second')).toBeInTheDocument();
    expect(within(nav).getByText('Second')).toHaveAttribute('aria-current', 'page');
  });
});