doTestLogin example

'http_errors' => FALSE,
      'cookies' => $this->cookies,
    ]);
    return $result;
  }

  /** * Tests user session life cycle. */
  public function testLogin() {
    // Without the serialization module only JSON is supported.     $this->doTestLogin('json');

    // Enable serialization so we have access to additional formats.     $this->container->get('module_installer')->install(['serialization']);
    $this->rebuildAll();

    $this->doTestLogin('json');
    $this->doTestLogin('xml');
  }

  /** * Do login testing for a given serialization format. * * @param string $format * Serialization format. */