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) {
        $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);
    }
    
    /**
     * @return array
     */
    public 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',
                        ],
                    ],
                ],
            ],
        ];
    }

}