class BreadcrumbFrontCacheContextsTest

class BreadcrumbFrontCacheContextsTest extends BrowserTestBase {
    use AssertBreadcrumbTrait;
    
    /**
     * {@inheritdoc}
     */
    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() : void {
        // 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());
    }

}