class HtmlResponseAttachmentsTest

class HtmlResponseAttachmentsTest extends BrowserTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'render_attached_test',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * Tests rendering of ['#attached'].
     */
    public function testAttachments() : void {
        // Test ['#attached']['http_header] = ['Status', $code].
        $this->drupalGet('/render_attached_test/teapot');
        $this->assertSession()
            ->statusCodeEquals(418);
        $this->assertSession()
            ->responseHeaderEquals('X-Drupal-Cache', 'MISS');
        // Repeat for the cache.
        $this->drupalGet('/render_attached_test/teapot');
        $this->assertSession()
            ->statusCodeEquals(418);
        $this->assertSession()
            ->responseHeaderEquals('X-Drupal-Cache', 'HIT');
        // Test ['#attached']['http_header'] with various replacement rules.
        $this->drupalGet('/render_attached_test/header');
        $this->assertTeapotHeaders();
        $this->assertSession()
            ->responseHeaderEquals('X-Drupal-Cache', 'MISS');
        // Repeat for the cache.
        $this->drupalGet('/render_attached_test/header');
        $this->assertSession()
            ->responseHeaderEquals('X-Drupal-Cache', 'HIT');
        // Test ['#attached']['feed'].
        $this->drupalGet('/render_attached_test/feed');
        $this->assertSession()
            ->responseHeaderEquals('X-Drupal-Cache', 'MISS');
        $this->assertFeed();
        // Repeat for the cache.
        $this->drupalGet('/render_attached_test/feed');
        $this->assertSession()
            ->responseHeaderEquals('X-Drupal-Cache', 'HIT');
        // Test ['#attached']['html_head'].
        $this->drupalGet('/render_attached_test/head');
        $this->assertSession()
            ->responseHeaderEquals('X-Drupal-Cache', 'MISS');
        $this->assertHead();
        // Repeat for the cache.
        $this->drupalGet('/render_attached_test/head');
        $this->assertSession()
            ->responseHeaderEquals('X-Drupal-Cache', 'HIT');
        // Test ['#attached']['html_head_link'] when outputted as HTTP header.
        $this->drupalGet('/render_attached_test/html_header_link');
        $expected_link_headers = [
            '</foo?bar=<baz>&baz=false>; rel="alternate"',
            '</foo/bar>; hreflang="nl"; rel="alternate"',
            '</foo/bar>; hreflang="de"; rel="alternate"',
        ];
        $this->assertEquals($expected_link_headers, $this->getSession()
            ->getResponseHeaders()['Link']);
        // Check that duplicate alternate URLs with different hreflang attributes
        // are allowed.
        $this->assertSession()
            ->elementsCount('xpath', '//head/link[@rel="alternate"][@href="/foo/bar"]', 2);
    }
    
    /**
     * Tests caching of ['#attached'].
     */
    public function testRenderCachedBlock() : void {
        // Make sure our test block is visible.
        $this->drupalPlaceBlock('attached_rendering_block', [
            'region' => 'content',
        ]);
        // Get the front page, which should now have our visible block.
        $this->drupalGet('');
        // Make sure our block is visible.
        $this->assertSession()
            ->pageTextContains('Markup from attached_rendering_block.');
        // Test that all our attached items are present.
        $this->assertFeed();
        $this->assertHead();
        $this->assertSession()
            ->statusCodeEquals(418);
        $this->assertTeapotHeaders();
        // Reload the page, to test caching.
        $this->drupalGet('');
        // Make sure our block is visible.
        $this->assertSession()
            ->pageTextContains('Markup from attached_rendering_block.');
        // The header should be present again.
        $this->assertSession()
            ->responseHeaderEquals('X-Test-Teapot', 'Teapot Mode Active');
    }
    
    /**
     * Helper function to make assertions about added HTTP headers.
     *
     * @internal
     */
    protected function assertTeapotHeaders() : void {
        $this->assertSession()
            ->responseHeaderEquals('X-Test-Teapot', 'Teapot Mode Active');
        $this->assertSession()
            ->responseHeaderEquals('X-Test-Teapot-Replace', 'Teapot replaced');
        $this->assertSession()
            ->responseHeaderEquals('X-Test-Teapot-No-Replace', 'This value is not replaced');
    }
    
    /**
     * Helper function to make assertions about the presence of an RSS feed.
     *
     * @internal
     */
    protected function assertFeed() : void {
        // Discover the DOM element for the feed link.
        $test_meta = $this->xpath('//head/link[@href="test://url"]');
        $this->assertCount(1, $test_meta, 'Link has URL.');
        // Reconcile the other attributes.
        $test_meta_attributes = [
            'href' => 'test://url',
            'rel' => 'alternate',
            'type' => 'application/rss+xml',
            'title' => 'Your RSS feed.',
        ];
        $test_meta = reset($test_meta);
        if (empty($test_meta)) {
            $this->fail('Unable to find feed link.');
        }
        else {
            foreach ($test_meta_attributes as $attribute => $value) {
                $this->assertEquals($value, $test_meta->getAttribute($attribute));
            }
        }
    }
    
    /**
     * Helper function to make assertions about HTML head elements.
     *
     * @internal
     */
    protected function assertHead() : void {
        // Discover the DOM element for the meta link.
        $test_meta = $this->xpath('//head/meta[@test-attribute="test_value"]');
        $this->assertCount(1, $test_meta, 'There\'s only one test attribute.');
        // Grab the only DOM element.
        $test_meta = reset($test_meta);
        if (empty($test_meta)) {
            $this->fail('Unable to find the head meta.');
        }
        else {
            $this->assertEquals('test_value', $test_meta->getAttribute('test-attribute'));
        }
    }

}