class BackendCompilerPassTest

class BackendCompilerPassTest extends UnitTestCase {
    
    /**
     * The tested backend compiler pass.
     *
     * @var \Drupal\Core\DependencyInjection\Compiler\BackendCompilerPass
     */
    protected $backendPass;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() {
        $this->backendPass = new BackendCompilerPass();
    }
    
    /**
     * Tests the process method.
     *
     * @param string $expected_class
     *   The expected used class.
     * @param \Symfony\Component\DependencyInjection\ContainerBuilder $container
     *   The container.
     *
     * @dataProvider providerTestProcess
     *
     * @covers ::process
     */
    public function testProcess($expected_class, ContainerBuilder $container) {
        $this->backendPass
            ->process($container);
        $this->assertEquals($expected_class, get_class($container->get('service')));
    }
    
    /**
     * Provides test data for testProcess().
     *
     * @return array
     */
    public function providerTestProcess() {
        $data = [];
        // Add a container with no set default_backend.
        $prefix = __NAMESPACE__ . '\\ServiceClass';
        $service = (new Definition($prefix . 'Default'))->addTag('backend_overridable');
        $container = $this->getMysqlContainer($service);
        $data[] = [
            $prefix . 'Default',
            $container,
        ];
        // Set the default_backend so the mysql service should be used.
        $container = $this->getMysqlContainer($service);
        $container->setParameter('default_backend', 'mysql');
        $data[] = [
            $prefix . 'Mysql',
            $container,
        ];
        // Configure a manual alias for the service, so ensure that it is not
        // overridden by the default backend.
        $container = $this->getMysqlContainer($service);
        $container->setParameter('default_backend', 'mysql');
        $container->setDefinition('mariadb.service', new Definition($prefix . 'MariaDb'));
        $container->setAlias('service', new Alias('mariadb.service'));
        $data[] = [
            $prefix . 'MariaDb',
            $container,
        ];
        // Check the database driver is the default.
        $container = $this->getSqliteContainer($service);
        $data[] = [
            $prefix . 'Sqlite',
            $container,
        ];
        // Test the opt out.
        $container = $this->getSqliteContainer($service);
        $container->setParameter('default_backend', '');
        $data[] = [
            $prefix . 'Default',
            $container,
        ];
        return $data;
    }
    
    /**
     * Creates a container with a sqlite database service in it.
     *
     * This is necessary because the container clone does not clone the parameter
     * bag so the setParameter() call effects the parent container as well.
     *
     * @param $service
     *
     * @return \Symfony\Component\DependencyInjection\ContainerBuilder
     */
    protected function getSqliteContainer($service) {
        $container = new ContainerBuilder();
        $container->setDefinition('service', $service);
        $container->setDefinition('sqlite.service', new Definition(__NAMESPACE__ . '\\ServiceClassSqlite'));
        $mock = $this->getMockBuilder('Drupal\\Core\\Database\\Driver\\sqlite\\Connection')
            ->setMethods(NULL)
            ->disableOriginalConstructor()
            ->getMock();
        $container->set('database', $mock);
        return $container;
    }
    
    /**
     * Creates a container with a mysql database service definition in it.
     *
     * This is necessary because the container clone does not clone the parameter
     * bag so the setParameter() call effects the parent container as well.
     *
     * @param $service
     *
     * @return \Symfony\Component\DependencyInjection\ContainerBuilder
     */
    protected function getMysqlContainer($service) {
        $container = new ContainerBuilder();
        $container->setDefinition('service', $service);
        $container->setDefinition('mysql.service', new Definition(__NAMESPACE__ . '\\ServiceClassMysql'));
        return $container;
    }

}