MimeTypeGuesserTest.php

<?php

namespace Drupal\Tests\Core\File;

use Drupal\Core\DependencyInjection\ContainerBuilder;
use Drupal\Core\File\MimeType\MimeTypeGuesser;
use Drupal\Core\StreamWrapper\StreamWrapperManager;
use Drupal\Tests\UnitTestCase;
use Symfony\Component\HttpFoundation\File\MimeType\MimeTypeGuesser as SymfonyMimeTypeGuesser;

/**
 * @coversDefaultClass \Drupal\Core\File\MimeType\MimeTypeGuesser
 * @group DrupalKernel
 */
class MimeTypeGuesserTest extends UnitTestCase {
    
    /**
     * @covers ::registerWithSymfonyGuesser
     *
     * @see Symfony\Component\HttpFoundation\File\MimeType\MimeTypeGuesser
     */
    public function testSymfonyGuesserRegistration() {
        // Make the guessers property accessible on Symfony's MimeTypeGuesser.
        $symfony_guesser = SymfonyMimeTypeGuesser::getInstance();
        // Test that the Drupal mime type guess is not being used before the
        // override method is called. It is possible that the test environment does
        // not support the default guessers.
        $guessers = $this->readAttribute($symfony_guesser, 'guessers');
        if (count($guessers)) {
            $this->assertNotInstanceOf('Drupal\\Core\\File\\MimeType\\MimeTypeGuesser', $guessers[0]);
        }
        $container = new ContainerBuilder();
        $container->set('file.mime_type.guesser', new MimeTypeGuesser(new StreamWrapperManager()));
        MimeTypeGuesser::registerWithSymfonyGuesser($container);
        $symfony_guesser = SymfonyMimeTypeGuesser::getInstance();
        $guessers = $this->readAttribute($symfony_guesser, 'guessers');
        $this->assertSame($container->get('file.mime_type.guesser'), $guessers[0]);
        $this->assertInstanceOf('Drupal\\Core\\File\\MimeType\\MimeTypeGuesser', $guessers[0]);
        $count = count($guessers);
        $container = new ContainerBuilder();
        $container->set('file.mime_type.guesser', new MimeTypeGuesser(new StreamWrapperManager()));
        MimeTypeGuesser::registerWithSymfonyGuesser($container);
        $symfony_guesser = SymfonyMimeTypeGuesser::getInstance();
        $guessers = $this->readAttribute($symfony_guesser, 'guessers');
        $this->assertSame($container->get('file.mime_type.guesser'), $guessers[0]);
        $this->assertInstanceOf('Drupal\\Core\\File\\MimeType\\MimeTypeGuesser', $guessers[0]);
        $new_count = count($guessers);
        $this->assertEquals($count, $new_count, 'The count of mime type guessers remains the same after container re-init.');
    }

}