test: breadcrumb navigation unit tests

Author: Robbert

packages/ui/src/components/Breadcrumb/Breadcrumb.test.tsx

@@ -0,0 +1,93 @@
+import { render, screen } from '@testing-library/react';
+import Link from 'next/link';
+import { Breadcrumbs } from './index';
+import '@testing-library/jest-dom';
+
+describe('Breadcrumb navigation', () => {
+  const props = {
+    label: 'Kruimelpad',
+    links: [
+      {
+        href: 'https://www.utrecht.nl/',
+        label: 'Home',
+        current: false,
+        rel: 'home',
+      },
+      {
+        href: '/',
+        label: 'Online loket',
+        current: true,
+      },
+    ],
+    backLink: {
+      href: '/',
+      label: 'Online loket',
+      current: false,
+    },
+    Link: Link,
+  };
+
+  it('renders a navigation landmark', () => {
+    render(<Breadcrumbs {...props} />);
+
+    const navigation = screen.getByRole('navigation', { name: 'Kruimelpad' });
+
+    expect(navigation).toBeInTheDocument();
+  });
+
+  it('renders links', () => {
+    render(<Breadcrumbs {...props} />);
+
+    const links = screen.getAllByRole('link');
+
+    expect(links.length).toBe(props.links.length);
+  });
+
+  it('renders a link', () => {
+    render(<Breadcrumbs {...props} />);
+
+    const link = screen.getByRole('link', { name: 'Home' });
+
+    expect(link).toBeInTheDocument();
+    expect(link).toHaveAttribute('href', 'https://www.utrecht.nl/');
+    expect(link).toHaveAttribute('rel', 'home');
+  });
+
+  it('renders a current link', () => {
+    render(<Breadcrumbs {...props} />);
+
+    const link = screen.getByRole('link', { name: 'Online loket', current: 'page' });
+
+    expect(link).toBeInTheDocument();
+  });
+
+  it('renders no separator for one link', () => {
+    const { container } = render(<Breadcrumbs {...props} links={props.links.slice(0, 1)} />);
+
+    const separator = container.querySelector('.utrecht-breadcrumb-nav__separator');
+
+    expect(separator).not.toBeInTheDocument();
+  });
+
+  it('renders separators between items', () => {
+    const { container } = render(<Breadcrumbs {...props} />);
+
+    const separators = container.querySelectorAll(
+      '.utrecht-breadcrumb-nav__item + .utrecht-breadcrumb-nav__separator + .utrecht-breadcrumb-nav__item',
+    );
+
+    expect(separators.length).toBe(props.links.length - 1);
+  });
+
+  it('renders a custom Link component', () => {
+    const { container } = render(
+      <Breadcrumbs {...props} Link={({ props }) => <a {...props} className="custom-link" />} />,
+    );
+
+    const links = container.querySelectorAll('.custom-link');
+
+    expect(links.length).toBe(props.links.length);
+  });
+
+  // TODO: Test small screen breadcrumb
+});