class RendererTest

class RendererTest extends RendererTestBase {
    protected $defaultThemeVars = [
        '#cache' => [
            'contexts' => [
                'languages:language_interface',
                'theme',
            ],
            'tags' => [],
            'max-age' => Cache::PERMANENT,
        ],
        '#attached' => [],
        '#children' => '',
    ];
    
    /**
     * @covers ::render
     * @covers ::doRender
     *
     * @dataProvider providerTestRenderBasic
     */
    public function testRenderBasic($build, $expected, callable $setup_code = NULL) {
        if (isset($setup_code)) {
            $setup_code = $setup_code->bindTo($this);
            $setup_code();
        }
        if (isset($build['#markup'])) {
            $this->assertNotInstanceOf(MarkupInterface::class, $build['#markup']);
        }
        $render_output = $this->renderer
            ->renderRoot($build);
        $this->assertSame($expected, (string) $render_output);
        if ($render_output !== '') {
            $this->assertInstanceOf(MarkupInterface::class, $render_output);
            $this->assertInstanceOf(MarkupInterface::class, $build['#markup']);
        }
    }
    
    /**
     * Provides a list of render arrays to test basic rendering.
     *
     * @return array
     */
    public function providerTestRenderBasic() {
        $data = [];
        // Part 1: the most simplistic render arrays possible, none using #theme.
        // Pass a NULL.
        $data[] = [
            NULL,
            '',
        ];
        // Pass an empty string.
        $data[] = [
            '',
            '',
        ];
        // Previously printed, see ::renderTwice for a more integration-like test.
        $data[] = [
            [
                '#markup' => 'foo',
                '#printed' => TRUE,
            ],
            '',
        ];
        // Printed in pre_render.
        $data[] = [
            [
                '#markup' => 'foo',
                '#pre_render' => [
                    [
                        new TestCallables(),
                        'preRenderPrinted',
                    ],
                ],
            ],
            '',
        ];
        // Basic #markup based renderable array.
        $data[] = [
            [
                '#markup' => 'foo',
            ],
            'foo',
        ];
        // Basic #markup based renderable array with value '0'.
        $data[] = [
            [
                '#markup' => '0',
            ],
            '0',
        ];
        // Basic #markup based renderable array with value 0.
        $data[] = [
            [
                '#markup' => 0,
            ],
            '0',
        ];
        // Basic #markup based renderable array with value ''.
        $data[] = [
            [
                '#markup' => '',
            ],
            '',
        ];
        // Basic #markup based renderable array with value NULL.
        $data[] = [
            [
                '#markup' => NULL,
            ],
            '',
        ];
        // Basic #plain_text based renderable array.
        $data[] = [
            [
                '#plain_text' => 'foo',
            ],
            'foo',
        ];
        // Mixing #plain_text and #markup based renderable array.
        $data[] = [
            [
                '#plain_text' => '<em>foo</em>',
                '#markup' => 'bar',
            ],
            '&lt;em&gt;foo&lt;/em&gt;',
        ];
        // Safe strings in #plain_text are still escaped.
        $data[] = [
            [
                '#plain_text' => Markup::create('<em>foo</em>'),
            ],
            '&lt;em&gt;foo&lt;/em&gt;',
        ];
        // #plain_text based renderable array with value '0'.
        $data[] = [
            [
                '#plain_text' => '0',
            ],
            '0',
        ];
        // #plain_text based renderable array with value 0.
        $data[] = [
            [
                '#plain_text' => 0,
            ],
            '0',
        ];
        // #plain_text based renderable array with value ''.
        $data[] = [
            [
                '#plain_text' => '',
            ],
            '',
        ];
        // #plain_text based renderable array with value NULL.
        $data[] = [
            [
                '#plain_text' => NULL,
            ],
            '',
        ];
        // Renderable child element.
        $data[] = [
            [
                'child' => [
                    '#markup' => 'bar',
                ],
            ],
            'bar',
        ];
        // XSS filtering test.
        $data[] = [
            [
                'child' => [
                    '#markup' => "This is <script>alert('XSS')</script> test",
                ],
            ],
            "This is alert('XSS') test",
        ];
        // XSS filtering test.
        $data[] = [
            [
                'child' => [
                    '#markup' => "This is <script>alert('XSS')</script> test",
                    '#allowed_tags' => [
                        'script',
                    ],
                ],
            ],
            "This is <script>alert('XSS')</script> test",
        ];
        // XSS filtering test.
        $data[] = [
            [
                'child' => [
                    '#markup' => "This is <script><em>alert('XSS')</em></script> <strong>test</strong>",
                    '#allowed_tags' => [
                        'em',
                        'strong',
                    ],
                ],
            ],
            "This is <em>alert('XSS')</em> <strong>test</strong>",
        ];
        // Html escaping test.
        $data[] = [
            [
                'child' => [
                    '#plain_text' => "This is <script><em>alert('XSS')</em></script> <strong>test</strong>",
                ],
            ],
            "This is &lt;script&gt;&lt;em&gt;alert(&#039;XSS&#039;)&lt;/em&gt;&lt;/script&gt; &lt;strong&gt;test&lt;/strong&gt;",
        ];
        // XSS filtering by default test.
        $data[] = [
            [
                'child' => [
                    '#markup' => "This is <script><em>alert('XSS')</em></script> <strong>test</strong>",
                ],
            ],
            "This is <em>alert('XSS')</em> <strong>test</strong>",
        ];
        // Ensure non-XSS tags are not filtered out.
        $data[] = [
            [
                'child' => [
                    '#markup' => "This is <strong><script>alert('not a giraffe')</script></strong> test",
                ],
            ],
            "This is <strong>alert('not a giraffe')</strong> test",
        ];
        // #children set but empty, and renderable children.
        $data[] = [
            [
                '#children' => '',
                'child' => [
                    '#markup' => 'bar',
                ],
            ],
            'bar',
        ];
        // #children set, not empty, and renderable children. #children will be
        // assumed oto be the rendered child elements, even though the #markup for
        // 'child' differs.
        $data[] = [
            [
                '#children' => 'foo',
                'child' => [
                    '#markup' => 'bar',
                ],
            ],
            'foo',
        ];
        // Ensure that content added to #markup via a #pre_render callback is safe.
        $data[] = [
            [
                '#markup' => 'foo',
                '#pre_render' => [
                    function ($elements) {
                        $elements['#markup'] .= '<script>alert("bar");</script>';
                        return $elements;
                    },
                ],
            ],
            'fooalert("bar");',
        ];
        // Test #allowed_tags in combination with #markup and #pre_render.
        $data[] = [
            [
                '#markup' => 'foo',
                '#allowed_tags' => [
                    'script',
                ],
                '#pre_render' => [
                    function ($elements) {
                        $elements['#markup'] .= '<script>alert("bar");</script>';
                        return $elements;
                    },
                ],
            ],
            'foo<script>alert("bar");</script>',
        ];
        // Ensure output is escaped when adding content to #check_plain through
        // a #pre_render callback.
        $data[] = [
            [
                '#plain_text' => 'foo',
                '#pre_render' => [
                    function ($elements) {
                        $elements['#plain_text'] .= '<script>alert("bar");</script>';
                        return $elements;
                    },
                ],
            ],
            'foo&lt;script&gt;alert(&quot;bar&quot;);&lt;/script&gt;',
        ];
        // Part 2: render arrays using #theme and #theme_wrappers.
        // Tests that #theme and #theme_wrappers can co-exist on an element.
        $build = [
            '#theme' => 'common_test_foo',
            '#foo' => 'foo',
            '#bar' => 'bar',
            '#theme_wrappers' => [
                'container',
            ],
            '#attributes' => [
                'class' => [
                    'baz',
                ],
            ],
        ];
        $setup_code_type_link = function () {
            $this->setupThemeContainer();
            $this->themeManager
                ->expects($this->at(0))
                ->method('render')
                ->with('common_test_foo', $this->anything())
                ->willReturnCallback(function ($theme, $vars) {
                return $vars['#foo'] . $vars['#bar'];
            });
        };
        $data[] = [
            $build,
            '<div class="baz">foobar</div>' . "\n",
            $setup_code_type_link,
        ];
        // Tests that #theme_wrappers can disambiguate element attributes shared
        // with rendering methods that build #children by using the alternate
        // #theme_wrappers attribute override syntax.
        $build = [
            '#type' => 'link',
            '#theme_wrappers' => [
                'container' => [
                    '#attributes' => [
                        'class' => [
                            'baz',
                        ],
                    ],
                ],
            ],
            '#attributes' => [
                'id' => 'foo',
            ],
            '#url' => 'https://www.drupal.org',
            '#title' => 'bar',
        ];
        $setup_code_type_link = function () {
            $this->setupThemeContainer();
            $this->themeManager
                ->expects($this->at(0))
                ->method('render')
                ->with('link', $this->anything())
                ->willReturnCallback(function ($theme, $vars) {
                $attributes = new Attribute([
                    'href' => $vars['#url'],
                ] + (isset($vars['#attributes']) ? $vars['#attributes'] : []));
                return '<a' . (string) $attributes . '>' . $vars['#title'] . '</a>';
            });
        };
        $data[] = [
            $build,
            '<div class="baz"><a href="https://www.drupal.org" id="foo">bar</a></div>' . "\n",
            $setup_code_type_link,
        ];
        // Tests that #theme_wrappers can disambiguate element attributes when the
        // "base" attribute is not set for #theme.
        $build = [
            '#type' => 'link',
            '#url' => 'https://www.drupal.org',
            '#title' => 'foo',
            '#theme_wrappers' => [
                'container' => [
                    '#attributes' => [
                        'class' => [
                            'baz',
                        ],
                    ],
                ],
            ],
        ];
        $data[] = [
            $build,
            '<div class="baz"><a href="https://www.drupal.org">foo</a></div>' . "\n",
            $setup_code_type_link,
        ];
        // Tests two 'container' #theme_wrappers, one using the "base" attributes
        // and one using an override.
        $build = [
            '#attributes' => [
                'class' => [
                    'foo',
                ],
            ],
            '#theme_wrappers' => [
                'container' => [
                    '#attributes' => [
                        'class' => [
                            'bar',
                        ],
                    ],
                ],
                'container',
            ],
        ];
        $setup_code = function () {
            $this->setupThemeContainer($this->any());
        };
        $data[] = [
            $build,
            '<div class="foo"><div class="bar"></div>' . "\n" . '</div>' . "\n",
            $setup_code,
        ];
        // Tests array syntax theme hook suggestion in #theme_wrappers.
        $build = [
            '#theme_wrappers' => [
                [
                    'container',
                ],
            ],
            '#attributes' => [
                'class' => [
                    'foo',
                ],
            ],
        ];
        $setup_code = function () {
            $this->setupThemeContainerMultiSuggestion($this->any());
        };
        $data[] = [
            $build,
            '<div class="foo"></div>' . "\n",
            $setup_code,
        ];
        // Part 3: render arrays using #markup as a fallback for #theme hooks.
        // Theme suggestion is not implemented, #markup should be rendered.
        $build = [
            '#theme' => [
                'suggestionnotimplemented',
            ],
            '#markup' => 'foo',
        ];
        $setup_code = function () {
            $this->themeManager
                ->expects($this->once())
                ->method('render')
                ->with([
                'suggestionnotimplemented',
            ], $this->anything())
                ->willReturn(FALSE);
        };
        $data[] = [
            $build,
            'foo',
            $setup_code,
        ];
        // Tests unimplemented theme suggestion, child #markup should be rendered.
        $build = [
            '#theme' => [
                'suggestionnotimplemented',
            ],
            'child' => [
                '#markup' => 'foo',
            ],
        ];
        $setup_code = function () {
            $this->themeManager
                ->expects($this->once())
                ->method('render')
                ->with([
                'suggestionnotimplemented',
            ], $this->anything())
                ->willReturn(FALSE);
        };
        $data[] = [
            $build,
            'foo',
            $setup_code,
        ];
        // Tests implemented theme suggestion: #markup should not be rendered.
        $build = [
            '#theme' => [
                'common_test_empty',
            ],
            '#markup' => 'foo',
        ];
        $theme_function_output = $this->randomContextValue();
        $setup_code = function () use ($theme_function_output) {
            $this->themeManager
                ->expects($this->once())
                ->method('render')
                ->with([
                'common_test_empty',
            ], $this->anything())
                ->willReturn($theme_function_output);
        };
        $data[] = [
            $build,
            $theme_function_output,
            $setup_code,
        ];
        // Tests implemented theme suggestion: children should not be rendered.
        $build = [
            '#theme' => [
                'common_test_empty',
            ],
            'child' => [
                '#markup' => 'foo',
            ],
        ];
        $data[] = [
            $build,
            $theme_function_output,
            $setup_code,
        ];
        // Part 4: handling of #children and child renderable elements.
        // #theme is implemented so the values of both #children and 'child' will
        // be ignored - it is the responsibility of the theme hook to render these
        // if appropriate.
        $build = [
            '#theme' => 'common_test_foo',
            '#children' => 'baz',
            'child' => [
                '#markup' => 'boo',
            ],
        ];
        $setup_code = function () {
            $this->themeManager
                ->expects($this->once())
                ->method('render')
                ->with('common_test_foo', $this->anything())
                ->willReturn('foobar');
        };
        $data[] = [
            $build,
            'foobar',
            $setup_code,
        ];
        // #theme is implemented but #render_children is TRUE. As in the case where
        // #theme is not set, empty #children means child elements are rendered
        // recursively.
        $build = [
            '#theme' => 'common_test_foo',
            '#children' => '',
            '#render_children' => TRUE,
            'child' => [
                '#markup' => 'boo',
            ],
        ];
        $setup_code = function () {
            $this->themeManager
                ->expects($this->never())
                ->method('render');
        };
        $data[] = [
            $build,
            'boo',
            $setup_code,
        ];
        // #theme is implemented but #render_children is TRUE. As in the case where
        // #theme is not set, #children will take precedence over 'child'.
        $build = [
            '#theme' => 'common_test_foo',
            '#children' => 'baz',
            '#render_children' => TRUE,
            'child' => [
                '#markup' => 'boo',
            ],
        ];
        $setup_code = function () {
            $this->themeManager
                ->expects($this->never())
                ->method('render');
        };
        $data[] = [
            $build,
            'baz',
            $setup_code,
        ];
        // #theme is implemented but #render_children is TRUE. In this case the
        // calling code is expecting only the children to be rendered. #prefix and
        // #suffix should not be inherited for the children.
        $build = [
            '#theme' => 'common_test_foo',
            '#children' => '',
            '#prefix' => 'kangaroo',
            '#suffix' => 'unicorn',
            '#render_children' => TRUE,
            'child' => [
                '#markup' => 'kitten',
            ],
        ];
        $setup_code = function () {
            $this->themeManager
                ->expects($this->never())
                ->method('render');
        };
        $data[] = [
            $build,
            'kitten',
            $setup_code,
        ];
        return $data;
    }
    
    /**
     * @covers ::render
     * @covers ::doRender
     */
    public function testRenderSorting() {
        $first = $this->randomMachineName();
        $second = $this->randomMachineName();
        // Build an array with '#weight' set for each element.
        $elements = [
            'second' => [
                '#weight' => 10,
                '#markup' => $second,
            ],
            'first' => [
                '#weight' => 0,
                '#markup' => $first,
            ],
        ];
        $output = $this->renderer
            ->renderRoot($elements);
        // The lowest weight element should appear last in $output.
        $this->assertTrue(strpos($output, $second) > strpos($output, $first), 'Elements were sorted correctly by weight.');
        // Confirm that the $elements array has '#sorted' set to TRUE.
        $this->assertTrue($elements['#sorted'], "'#sorted' => TRUE was added to the array");
        // Pass $elements through \Drupal\Core\Render\Element::children() and
        // ensure it remains sorted in the correct order. drupal_render() will
        // return an empty string if used on the same array in the same request.
        $children = Element::children($elements);
        $this->assertTrue(array_shift($children) == 'first', 'Child found in the correct order.');
        $this->assertTrue(array_shift($children) == 'second', 'Child found in the correct order.');
    }
    
    /**
     * @covers ::render
     * @covers ::doRender
     */
    public function testRenderSortingWithSetHashSorted() {
        $first = $this->randomMachineName();
        $second = $this->randomMachineName();
        // The same array structure again, but with #sorted set to TRUE.
        $elements = [
            'second' => [
                '#weight' => 10,
                '#markup' => $second,
            ],
            'first' => [
                '#weight' => 0,
                '#markup' => $first,
            ],
            '#sorted' => TRUE,
        ];
        $output = $this->renderer
            ->renderRoot($elements);
        // The elements should appear in output in the same order as the array.
        $this->assertTrue(strpos($output, $second) < strpos($output, $first), 'Elements were not sorted.');
    }
    
    /**
     * @covers ::render
     * @covers ::doRender
     *
     * @dataProvider providerAccessValues
     */
    public function testRenderWithPresetAccess($access) {
        $build = [
            '#access' => $access,
        ];
        $this->assertAccess($build, $access);
    }
    
    /**
     * @covers ::render
     * @covers ::doRender
     *
     * @dataProvider providerAccessValues
     */
    public function testRenderWithAccessCallbackCallable($access) {
        $build = [
            '#access_callback' => function () use ($access) {
                return $access;
            },
        ];
        $this->assertAccess($build, $access);
    }
    
    /**
     * Ensures that the #access property wins over the callable.
     *
     * @covers ::render
     * @covers ::doRender
     *
     * @dataProvider providerAccessValues
     */
    public function testRenderWithAccessPropertyAndCallback($access) {
        $build = [
            '#access' => $access,
            '#access_callback' => function () {
                return TRUE;
            },
        ];
        $this->assertAccess($build, $access);
    }
    
    /**
     * @covers ::render
     * @covers ::doRender
     *
     * @dataProvider providerAccessValues
     */
    public function testRenderWithAccessControllerResolved($access) {
        switch ($access) {
            case AccessResult::allowed():
                $method = 'accessResultAllowed';
                break;
            case AccessResult::forbidden():
                $method = 'accessResultForbidden';
                break;
            case FALSE:
                $method = 'accessFalse';
                break;
            case TRUE:
                $method = 'accessTrue';
                break;
        }
        $build = [
            '#access_callback' => 'Drupal\\Tests\\Core\\Render\\TestAccessClass::' . $method,
        ];
        $this->assertAccess($build, $access);
    }
    
    /**
     * @covers ::render
     * @covers ::doRender
     */
    public function testRenderAccessCacheabilityDependencyInheritance() {
        $build = [
            '#access' => AccessResult::allowed()->addCacheContexts([
                'user',
            ]),
        ];
        $this->renderer
            ->renderPlain($build);
        $this->assertEquals([
            'languages:language_interface',
            'theme',
            'user',
        ], $build['#cache']['contexts']);
    }
    
    /**
     * Tests rendering same render array twice.
     *
     * Tests that a first render returns the rendered output and a second doesn't
     * because of the #printed property. Also tests that correct metadata has been
     * set for re-rendering.
     *
     * @covers ::render
     * @covers ::doRender
     *
     * @dataProvider providerRenderTwice
     */
    public function testRenderTwice($build) {
        $this->assertEquals('kittens', $this->renderer
            ->renderRoot($build));
        $this->assertEquals('kittens', $build['#markup']);
        $this->assertEquals([
            'kittens-147',
        ], $build['#cache']['tags']);
        $this->assertTrue($build['#printed']);
        // We don't want to reprint already printed render arrays.
        $this->assertEquals('', $this->renderer
            ->renderRoot($build));
    }
    
    /**
     * Provides a list of render array iterations.
     *
     * @return array
     */
    public function providerRenderTwice() {
        return [
            [
                [
                    '#markup' => 'kittens',
                    '#cache' => [
                        'tags' => [
                            'kittens-147',
                        ],
                    ],
                ],
            ],
            [
                [
                    'child' => [
                        '#markup' => 'kittens',
                        '#cache' => [
                            'tags' => [
                                'kittens-147',
                            ],
                        ],
                    ],
                ],
            ],
            [
                [
                    '#render_children' => TRUE,
                    'child' => [
                        '#markup' => 'kittens',
                        '#cache' => [
                            'tags' => [
                                'kittens-147',
                            ],
                        ],
                    ],
                ],
            ],
        ];
    }
    
    /**
     * Ensures that #access is taken in account when rendering #render_children.
     */
    public function testRenderChildrenAccess() {
        $build = [
            '#access' => FALSE,
            '#render_children' => TRUE,
            'child' => [
                '#markup' => 'kittens',
            ],
        ];
        $this->assertEquals('', $this->renderer
            ->renderRoot($build));
    }
    
    /**
     * Provides a list of both booleans.
     *
     * @return array
     */
    public function providerAccessValues() {
        return [
            [
                FALSE,
            ],
            [
                TRUE,
            ],
            [
                AccessResult::forbidden(),
            ],
            [
                AccessResult::allowed(),
            ],
        ];
    }
    
    /**
     * Asserts that a render array with access checking renders correctly.
     *
     * @param array $build
     *   A render array with either #access or #access_callback.
     * @param bool $access
     *   Whether the render array is accessible or not.
     */
    protected function assertAccess($build, $access) {
        $sensitive_content = $this->randomContextValue();
        $build['#markup'] = $sensitive_content;
        if ($access instanceof AccessResultInterface && $access->isAllowed() || $access === TRUE) {
            $this->assertSame($sensitive_content, (string) $this->renderer
                ->renderRoot($build));
        }
        else {
            $this->assertSame('', (string) $this->renderer
                ->renderRoot($build));
        }
    }
    protected function setupThemeContainer($matcher = NULL) {
        $this->themeManager
            ->expects($matcher ?: $this->at(1))
            ->method('render')
            ->with('container', $this->anything())
            ->willReturnCallback(function ($theme, $vars) {
            return '<div' . (string) new Attribute($vars['#attributes']) . '>' . $vars['#children'] . "</div>\n";
        });
    }
    protected function setupThemeContainerMultiSuggestion($matcher = NULL) {
        $this->themeManager
            ->expects($matcher ?: $this->at(1))
            ->method('render')
            ->with([
            'container',
        ], $this->anything())
            ->willReturnCallback(function ($theme, $vars) {
            return '<div' . (string) new Attribute($vars['#attributes']) . '>' . $vars['#children'] . "</div>\n";
        });
    }
    
    /**
     * @covers ::render
     * @covers ::doRender
     */
    public function testRenderWithoutThemeArguments() {
        $element = [
            '#theme' => 'common_test_foo',
        ];
        $this->themeManager
            ->expects($this->once())
            ->method('render')
            ->with('common_test_foo', $this->defaultThemeVars + $element)
            ->willReturn('foobar');
        // Test that defaults work.
        $this->assertEquals($this->renderer
            ->renderRoot($element), 'foobar', 'Defaults work');
    }
    
    /**
     * @covers ::render
     * @covers ::doRender
     */
    public function testRenderWithThemeArguments() {
        $element = [
            '#theme' => 'common_test_foo',
            '#foo' => $this->randomMachineName(),
            '#bar' => $this->randomMachineName(),
        ];
        $this->themeManager
            ->expects($this->once())
            ->method('render')
            ->with('common_test_foo', $this->defaultThemeVars + $element)
            ->willReturnCallback(function ($hook, $vars) {
            return $vars['#foo'] . $vars['#bar'];
        });
        // Tests that passing arguments to the theme function works.
        $this->assertEquals($this->renderer
            ->renderRoot($element), $element['#foo'] . $element['#bar'], 'Passing arguments to theme functions works');
    }
    
    /**
     * @covers ::render
     * @covers ::doRender
     * @covers \Drupal\Core\Render\RenderCache::get
     * @covers \Drupal\Core\Render\RenderCache::set
     * @covers \Drupal\Core\Render\RenderCache::createCacheID
     */
    public function testRenderCache() {
        $this->setUpRequest();
        $this->setupMemoryCache();
        // Create an empty element.
        $test_element = [
            '#cache' => [
                'keys' => [
                    'render_cache_test',
                ],
                'tags' => [
                    'render_cache_tag',
                ],
            ],
            '#markup' => '',
            'child' => [
                '#cache' => [
                    'keys' => [
                        'render_cache_test_child',
                    ],
                    'tags' => [
                        'render_cache_tag_child:1',
                        'render_cache_tag_child:2',
                    ],
                ],
                '#markup' => '',
            ],
        ];
        // Render the element and confirm that it goes through the rendering
        // process (which will set $element['#printed']).
        $element = $test_element;
        $this->renderer
            ->renderRoot($element);
        $this->assertTrue(isset($element['#printed']), 'No cache hit');
        // Render the element again and confirm that it is retrieved from the cache
        // instead (so $element['#printed'] will not be set).
        $element = $test_element;
        $this->renderer
            ->renderRoot($element);
        $this->assertFalse(isset($element['#printed']), 'Cache hit');
        // Test that cache tags are correctly collected from the render element,
        // including the ones from its subchild.
        $expected_tags = [
            'render_cache_tag',
            'render_cache_tag_child:1',
            'render_cache_tag_child:2',
        ];
        $this->assertEquals($expected_tags, $element['#cache']['tags'], 'Cache tags were collected from the element and its subchild.');
        // The cache item also has a 'rendered' cache tag.
        $cache_item = $this->cacheFactory
            ->get('render')
            ->get('render_cache_test:en:stark');
        $this->assertSame(Cache::mergeTags($expected_tags, [
            'rendered',
        ]), $cache_item->tags);
    }
    
    /**
     * @covers ::render
     * @covers ::doRender
     * @covers \Drupal\Core\Render\RenderCache::get
     * @covers \Drupal\Core\Render\RenderCache::set
     * @covers \Drupal\Core\Render\RenderCache::createCacheID
     *
     * @dataProvider providerTestRenderCacheMaxAge
     */
    public function testRenderCacheMaxAge($max_age, $is_render_cached, $render_cache_item_expire) {
        $this->setUpRequest();
        $this->setupMemoryCache();
        $element = [
            '#cache' => [
                'keys' => [
                    'render_cache_test',
                ],
                'max-age' => $max_age,
            ],
            '#markup' => '',
        ];
        $this->renderer
            ->renderRoot($element);
        $cache_item = $this->cacheFactory
            ->get('render')
            ->get('render_cache_test:en:stark');
        if (!$is_render_cached) {
            $this->assertFalse($cache_item);
        }
        else {
            $this->assertNotFalse($cache_item);
            $this->assertSame($render_cache_item_expire, $cache_item->expire);
        }
    }
    public function providerTestRenderCacheMaxAge() {
        return [
            [
                0,
                FALSE,
                NULL,
            ],
            [
                60,
                TRUE,
                (int) $_SERVER['REQUEST_TIME'] + 60,
            ],
            [
                Cache::PERMANENT,
                TRUE,
                -1,
            ],
        ];
    }
    
    /**
     * Tests that #cache_properties are properly handled.
     *
     * @param array $expected_results
     *   An associative array of expected results keyed by property name.
     *
     * @covers ::render
     * @covers ::doRender
     * @covers \Drupal\Core\Render\RenderCache::get
     * @covers \Drupal\Core\Render\RenderCache::set
     * @covers \Drupal\Core\Render\RenderCache::createCacheID
     * @covers \Drupal\Core\Render\RenderCache::getCacheableRenderArray
     *
     * @dataProvider providerTestRenderCacheProperties
     */
    public function testRenderCacheProperties(array $expected_results) {
        $this->setUpRequest();
        $this->setupMemoryCache();
        $element = $original = [
            '#cache' => [
                'keys' => [
                    'render_cache_test',
                ],
            ],
            // Collect expected property names.
'#cache_properties' => array_keys(array_filter($expected_results)),
            'child1' => [
                '#markup' => Markup::create('1'),
            ],
            'child2' => [
                '#markup' => Markup::create('2'),
            ],
            // Mark the value as safe.
'#custom_property' => Markup::create('custom_value'),
            '#custom_property_array' => [
                'custom value',
            ],
        ];
        $this->renderer
            ->renderRoot($element);
        $cache = $this->cacheFactory
            ->get('render');
        $data = $cache->get('render_cache_test:en:stark')->data;
        // Check that parent markup is ignored when caching children's markup.
        $this->assertEquals($data['#markup'] === '', (bool) Element::children($data));
        // Check that the element properties are cached as specified.
        foreach ($expected_results as $property => $expected) {
            $cached = !empty($data[$property]);
            $this->assertEquals($cached, (bool) $expected);
            // Check that only the #markup key is preserved for children.
            if ($cached) {
                $this->assertEquals($data[$property], $original[$property]);
            }
        }
        // #custom_property_array can not be a safe_cache_property.
        $safe_cache_properties = array_diff(Element::properties(array_filter($expected_results)), [
            '#custom_property_array',
        ]);
        foreach ($safe_cache_properties as $cache_property) {
            $this->assertInstanceOf(MarkupInterface::class, $data[$cache_property]);
        }
    }
    
    /**
     * Data provider for ::testRenderCacheProperties().
     *
     * @return array
     *   An array of associative arrays of expected results keyed by property
     *   name.
     */
    public function providerTestRenderCacheProperties() {
        return [
            [
                [],
            ],
            [
                [
                    'child1' => 0,
                    'child2' => 0,
                    '#custom_property' => 0,
                    '#custom_property_array' => 0,
                ],
            ],
            [
                [
                    'child1' => 0,
                    'child2' => 0,
                    '#custom_property' => 1,
                    '#custom_property_array' => 0,
                ],
            ],
            [
                [
                    'child1' => 0,
                    'child2' => 1,
                    '#custom_property' => 0,
                    '#custom_property_array' => 0,
                ],
            ],
            [
                [
                    'child1' => 0,
                    'child2' => 1,
                    '#custom_property' => 1,
                    '#custom_property_array' => 0,
                ],
            ],
            [
                [
                    'child1' => 1,
                    'child2' => 0,
                    '#custom_property' => 0,
                    '#custom_property_array' => 0,
                ],
            ],
            [
                [
                    'child1' => 1,
                    'child2' => 0,
                    '#custom_property' => 1,
                    '#custom_property_array' => 0,
                ],
            ],
            [
                [
                    'child1' => 1,
                    'child2' => 1,
                    '#custom_property' => 0,
                    '#custom_property_array' => 0,
                ],
            ],
            [
                [
                    'child1' => 1,
                    'child2' => 1,
                    '#custom_property' => 1,
                    '#custom_property_array' => 0,
                ],
            ],
            [
                [
                    'child1' => 1,
                    'child2' => 1,
                    '#custom_property' => 1,
                    '#custom_property_array' => 1,
                ],
            ],
        ];
    }
    
    /**
     * @covers ::addCacheableDependency
     *
     * @dataProvider providerTestAddCacheableDependency
     */
    public function testAddCacheableDependency(array $build, $object, array $expected) {
        $this->renderer
            ->addCacheableDependency($build, $object);
        $this->assertEquals($build, $expected);
    }
    public function providerTestAddCacheableDependency() {
        return [
            // Empty render array, typical default cacheability.
[
                [],
                new TestCacheableDependency([], [], Cache::PERMANENT),
                [
                    '#cache' => [
                        'contexts' => [],
                        'tags' => [],
                        'max-age' => Cache::PERMANENT,
                    ],
                ],
            ],
            // Empty render array, some cacheability.
[
                [],
                new TestCacheableDependency([
                    'user.roles',
                ], [
                    'foo',
                ], Cache::PERMANENT),
                [
                    '#cache' => [
                        'contexts' => [
                            'user.roles',
                        ],
                        'tags' => [
                            'foo',
                        ],
                        'max-age' => Cache::PERMANENT,
                    ],
                ],
            ],
            // Cacheable render array, some cacheability.
[
                [
                    '#cache' => [
                        'contexts' => [
                            'theme',
                        ],
                        'tags' => [
                            'bar',
                        ],
                        'max-age' => 600,
                    ],
                ],
                new TestCacheableDependency([
                    'user.roles',
                ], [
                    'foo',
                ], Cache::PERMANENT),
                [
                    '#cache' => [
                        'contexts' => [
                            'theme',
                            'user.roles',
                        ],
                        'tags' => [
                            'bar',
                            'foo',
                        ],
                        'max-age' => 600,
                    ],
                ],
            ],
            // Cacheable render array, no cacheability.
[
                [
                    '#cache' => [
                        'contexts' => [
                            'theme',
                        ],
                        'tags' => [
                            'bar',
                        ],
                        'max-age' => 600,
                    ],
                ],
                new \stdClass(),
                [
                    '#cache' => [
                        'contexts' => [
                            'theme',
                        ],
                        'tags' => [
                            'bar',
                        ],
                        'max-age' => 0,
                    ],
                ],
            ],
        ];
    }

}