function FunctionsTest::testDrupalPreRenderLinks

Tests the use of Link::preRenderLinks() on a nested array of links.

See also

\Drupal\Core\Render\Element\Link::preRenderLinks()

File

core/modules/system/tests/src/Kernel/Theme/FunctionsTest.php, line 425

Class

FunctionsTest

Tests for common theme functions.

Namespace

Code

public function testDrupalPreRenderLinks() : void {
  // Define the base array to be rendered, containing a variety of different
  // kinds of links.
  $base_array = [
    '#theme' => 'links',
    '#pre_render' => [
      [
        Link::class,
        'preRenderLinks',
      ],
    ],
    '#links' => [
      'parent_link' => [
        'title' => 'Parent link original',
        'url' => Url::fromRoute('router_test.1'),
      ],
    ],
    'first_child' => [
      '#theme' => 'links',
      '#links' => [
        // This should be rendered if 'first_child' is rendered separately,
        // but ignored if the parent is being rendered (since it duplicates
        // one of the parent's links).
'parent_link' => [
          'title' => 'Parent link copy',
          'url' => Url::fromRoute('router_test.6'),
        ],
        // This should always be rendered.
'first_child_link' => [
          'title' => 'First child link',
          'url' => Url::fromRoute('router_test.7'),
        ],
      ],
    ],
    // This should always be rendered as part of the parent.
'second_child' => [
      '#theme' => 'links',
      '#links' => [
        'second_child_link' => [
          'title' => 'Second child link',
          'url' => Url::fromRoute('router_test.8'),
        ],
      ],
    ],
    // This should never be rendered, since the user does not have access to
    // it.
'third_child' => [
      '#theme' => 'links',
      '#links' => [
        'third_child_link' => [
          'title' => 'Third child link',
          'url' => Url::fromRoute('router_test.9'),
        ],
      ],
      '#access' => FALSE,
    ],
  ];
  // Start with a fresh copy of the base array, and try rendering the entire
  // thing. We expect a single <ul> with appropriate links contained within
  // it.
  $render_array = $base_array;
  $html = (string) \Drupal::service('renderer')->renderRoot($render_array);
  $dom = Html::load($html);
  $this->assertEquals(1, $dom->getElementsByTagName('ul')->length, 'One "ul" tag found in the rendered HTML.');
  $list_elements = $dom->getElementsByTagName('li');
  $this->assertEquals(3, $list_elements->length, 'Three "li" tags found in the rendered HTML.');
  $this->assertEquals('Parent link original', $list_elements->item(0)->nodeValue, 'First expected link found.');
  $this->assertEquals('First child link', $list_elements->item(1)->nodeValue, 'Second expected link found.');
  $this->assertEquals('Second child link', $list_elements->item(2)->nodeValue, 'Third expected link found.');
  $this->assertStringNotContainsString('Parent link copy', $html, '"Parent link copy" link not found.');
  $this->assertStringNotContainsString('Third child link', $html, '"Third child link" link not found.');
  // Now render 'first_child', followed by the rest of the links, and make
  // sure we get two separate <ul>'s with the appropriate links contained
  // within each.
  $render_array = $base_array;
  $child_html = (string) \Drupal::service('renderer')->renderRoot($render_array['first_child']);
  $parent_html = (string) \Drupal::service('renderer')->renderRoot($render_array);
  // First check the child HTML.
  $dom = Html::load($child_html);
  $this->assertEquals(1, $dom->getElementsByTagName('ul')->length, 'One "ul" tag found in the rendered child HTML.');
  $list_elements = $dom->getElementsByTagName('li');
  $this->assertEquals(2, $list_elements->length, 'Two "li" tags found in the rendered child HTML.');
  $this->assertEquals('Parent link copy', $list_elements->item(0)->nodeValue, 'First expected link found.');
  $this->assertEquals('First child link', $list_elements->item(1)->nodeValue, 'Second expected link found.');
  // Then check the parent HTML.
  $dom = Html::load($parent_html);
  $this->assertEquals(1, $dom->getElementsByTagName('ul')->length, 'One "ul" tag found in the rendered parent HTML.');
  $list_elements = $dom->getElementsByTagName('li');
  $this->assertEquals(2, $list_elements->length, 'Two "li" tags found in the rendered parent HTML.');
  $this->assertEquals('Parent link original', $list_elements->item(0)->nodeValue, 'First expected link found.');
  $this->assertEquals('Second child link', $list_elements->item(1)->nodeValue, 'Second expected link found.');
  $this->assertStringNotContainsString('First child link', $parent_html, '"First child link" link not found.');
  $this->assertStringNotContainsString('Third child link', $parent_html, '"Third child link" link not found.');
}