class PlaceholderGeneratorTest

class PlaceholderGeneratorTest extends RendererTestBase {
    
    /**
     * The tested placeholder generator.
     *
     * @var \Drupal\Core\Render\PlaceholderGenerator
     */
    protected $placeholderGenerator;
    
    /**
     * 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.
     *
     * @covers ::createPlaceholder
     * @dataProvider providerCreatePlaceholderGeneratesValidHtmlMarkup
     */
    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',
                        ],
                    ],
                ],
            ],
        ];
    }

}