class BreadcrumbFrontCacheContextsTest

class BreadcrumbFrontCacheContextsTest extends BrowserTestBase {
  use AssertBreadcrumbTrait;
  
  /**
   * Modules to enable.
   *
   * @var array
   */
  protected static $modules = [
    'block',
    'node',
    'path',
    'user',
  ];
  
  /**
   * {@inheritdoc}
   */
  protected $defaultTheme = 'starterkit_theme';
  
  /**
   * A test node with path alias.
   *
   * @var \Drupal\node\NodeInterface
   */
  protected $nodeWithAlias;
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    $this->drupalPlaceBlock('system_breadcrumb_block');
    $user = $this->drupalCreateUser();
    $this->drupalCreateContentType([
      'type' => 'page',
    ]);
    // Create a node for front page.
    $node_front = $this->drupalCreateNode([
      'uid' => $user->id(),
    ]);
    // Create a node with a random alias.
    $this->nodeWithAlias = $this->drupalCreateNode([
      'uid' => $user->id(),
      'type' => 'page',
      'path' => '/' . $this->randomMachineName(),
    ]);
    // Configure 'node' as front page.
    $this->config('system.site')
      ->set('page.front', '/node/' . $node_front->id())
      ->save();
    \Drupal::cache('render')->deleteAll();
  }
  
  /**
   * Validate that breadcrumb markup get the right cache contexts.
   *
   * Checking that the breadcrumb will be printed on node canonical routes even
   * if it was rendered for the <front> page first.
   */
  public function testBreadcrumbsFrontPageCache() {
    // Hit front page first as anonymous user with 'cold' render cache.
    $this->drupalGet('<front>');
    $web_assert = $this->assertSession();
    // Verify that no breadcrumb block presents.
    $web_assert->elementNotExists('css', '.block-system-breadcrumb-block');
    // Verify that breadcrumb appears correctly for the test content
    // (which is not set as front page).
    $this->drupalGet($this->nodeWithAlias->path->alias);
    $breadcrumbs = $this->assertSession()
      ->elementExists('css', '.block-system-breadcrumb-block');
    $crumbs = $breadcrumbs->findAll('css', 'ol li');
    $this->assertCount(1, $crumbs);
    $this->assertSame('Home', $crumbs[0]->getText());
  }

}