GetRdfNamespacesTest.php

<?php

namespace Drupal\Tests\rdf\Functional;

use Drupal\Tests\BrowserTestBase;

/**
 * Tests hook_rdf_namespaces().
 *
 * @group rdf
 * @group legacy
 */
class GetRdfNamespacesTest extends BrowserTestBase {
    
    /**
     * Modules to enable.
     *
     * @var array
     */
    protected static $modules = [
        'rdf',
        'rdf_test_namespaces',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * Tests getting RDF namespaces.
     */
    public function testGetRdfNamespaces() {
        // Fetches the front page and extracts RDFa 1.1 prefixes.
        $this->drupalGet('');
        // We have to use the find() method on the driver directly because //html is
        // prepended to all xpath queries otherwise.
        $driver = $this->getSession()
            ->getDriver();
        $element = $driver->find('//html[contains(@prefix, "rdfs: http://www.w3.org/2000/01/rdf-schema#")]');
        $this->assertCount(1, $element, 'A prefix declared once is displayed.');
        $element = $driver->find('//html[contains(@prefix, "foaf: http://xmlns.com/foaf/0.1/")]');
        $this->assertCount(1, $element, 'The same prefix declared in several implementations of hook_rdf_namespaces() is valid as long as all the namespaces are the same.');
        $element = $driver->find('//html[contains(@prefix, "foaf1: http://xmlns.com/foaf/0.1/")]');
        $this->assertCount(1, $element, 'Two prefixes can be assigned the same namespace.');
        $element = $driver->find('//html[contains(@prefix, "dc: http://purl.org/dc/terms/")]');
        $this->assertCount(1, $element, 'When a prefix has conflicting namespaces, the first declared one is used.');
        // Get all RDF namespaces.
        $ns = rdf_get_namespaces();
        $this->assertEquals('http://www.w3.org/2000/01/rdf-schema#', $ns['rdfs'], 'A prefix declared once is included.');
        $this->assertEquals('http://xmlns.com/foaf/0.1/', $ns['foaf'], 'The same prefix declared in several implementations of hook_rdf_namespaces() is valid as long as all the namespaces are the same.');
        $this->assertEquals('http://xmlns.com/foaf/0.1/', $ns['foaf1'], 'Two prefixes can be assigned the same namespace.');
        // Enable rdf_conflicting_namespaces to ensure that an exception is thrown
        // when RDF namespaces are conflicting.
        \Drupal::service('module_installer')->install([
            'rdf_conflicting_namespaces',
        ], TRUE);
        try {
            $ns = rdf_get_namespaces();
            $this->fail('Expected exception not thrown for conflicting namespace declaration.');
        } catch (\Exception $e) {
            // Expected exception; just continue testing.
        }
    }

}