function assertResponseOk()
 {
     parent::assertResponseOk();
     $meta = $this->client->getResponse()->getData()->meta;
     $this->assertEquals(200, $meta->code);
     if (property_exists($meta, 'error_type')) {
         $this->assertNull($meta->error_type);
     }
     if (property_exists($meta, 'error_message')) {
         $this->assertNull($meta->error_message);
     }
 }