class PlaceholderGeneratorTest

class PlaceholderGeneratorTest extends RendererTestBase {
  
  /**
   * The tested placeholder generator.
   *
   * @var \Drupal\Core\Render\PlaceholderGenerator
   */
  protected $placeholderGenerator;
  
  /**
   * @covers ::createPlaceholder
   * @dataProvider providerCreatePlaceholderGeneratesValidHtmlMarkup
   *
   * Ensure that the generated placeholder markup is valid. If it is not, then
   * simply using DOMDocument on HTML that contains placeholders may modify the
   * placeholders' markup, which would make it impossible to replace the
   * placeholders: the placeholder markup in #attached versus that in the HTML
   * processed by DOMDocument would no longer match.
   */
  public function testCreatePlaceholderGeneratesValidHtmlMarkup(array $element) : void {
    $build = $this->placeholderGenerator
      ->createPlaceholder($element);
    $original_placeholder_markup = (string) $build['#markup'];
    $processed_placeholder_markup = Html::serialize(Html::load($build['#markup']));
    $this->assertEquals($original_placeholder_markup, $processed_placeholder_markup);
  }
  
  /**
   * Tests the creation of an element with a #lazy_builder callback.
   *
   * Between two renders neither the cache contexts nor tags sort should change.
   * A placeholder should generate the same hash, so it is not rendered twice.
   *
   * @covers ::createPlaceholder
   */
  public function testRenderPlaceholdersDifferentSortedContextsTags() : void {
    $contexts_1 = [
      'user',
      'foo',
    ];
    $contexts_2 = [
      'foo',
      'user',
    ];
    $tags_1 = [
      'current-temperature',
      'foo',
    ];
    $tags_2 = [
      'foo',
      'current-temperature',
    ];
    $test_element = [
      '#cache' => [
        'max-age' => Cache::PERMANENT,
      ],
      '#lazy_builder' => [
        'Drupal\\Tests\\Core\\Render\\PlaceholdersTest::callback',
        [
          'foo' => TRUE,
        ],
      ],
    ];
    $test_element['#cache']['contexts'] = $contexts_1;
    $test_element['#cache']['tags'] = $tags_1;
    $placeholder_element1 = $this->placeholderGenerator
      ->createPlaceholder($test_element);
    $test_element['#cache']['contexts'] = $contexts_2;
    $test_element['#cache']['tags'] = $tags_1;
    $placeholder_element2 = $this->placeholderGenerator
      ->createPlaceholder($test_element);
    $test_element['#cache']['contexts'] = $contexts_1;
    $test_element['#cache']['tags'] = $tags_2;
    $placeholder_element3 = $this->placeholderGenerator
      ->createPlaceholder($test_element);
    // Verify placeholder and specially hash are same with different contexts
    // order.
    $this->assertSame((string) $placeholder_element1['#markup'], (string) $placeholder_element2['#markup']);
    // Verify placeholder and specially hash are same with different tags order.
    $this->assertSame((string) $placeholder_element1['#markup'], (string) $placeholder_element3['#markup']);
  }
  
  /**
   * @return array
   */
  public static function providerCreatePlaceholderGeneratesValidHtmlMarkup() {
    return [
      'multiple-arguments' => [
        [
          '#lazy_builder' => [
            'Drupal\\Tests\\Core\\Render\\PlaceholdersTest::callback',
            [
              'foo',
              'bar',
            ],
          ],
        ],
      ],
      'special-character-&' => [
        [
          '#lazy_builder' => [
            'Drupal\\Tests\\Core\\Render\\PlaceholdersTest::callback',
            [
              'foo&bar',
            ],
          ],
        ],
      ],
      'special-character-"' => [
        [
          '#lazy_builder' => [
            'Drupal\\Tests\\Core\\Render\\PlaceholdersTest::callback',
            [
              'foo"bar',
            ],
          ],
        ],
      ],
      'special-character-<' => [
        [
          '#lazy_builder' => [
            'Drupal\\Tests\\Core\\Render\\PlaceholdersTest::callback',
            [
              'foo<bar',
            ],
          ],
        ],
      ],
      'special-character->' => [
        [
          '#lazy_builder' => [
            'Drupal\\Tests\\Core\\Render\\PlaceholdersTest::callback',
            [
              'foo>bar',
            ],
          ],
        ],
      ],
    ];
  }

}