public function testGroup()
 {
     $request = new FaceRequest('key', 'secret', 'http://apicn.faceplusplus.com', 'POST', '/foo', []);
     $body = '{ "person": [ { "person_id": "98b0fe01f6f212e19a3e659e324e37ab", "tag": "", "person_name": "Alice" }, { "person_id": "9d1598f2831eadfc5817008859865cbd", "tag": "", "person_name": "Bob" } ], "group_id": "f539fa9f6e4689397c76c57f2cfb4edc", "tag": "created_by_Alice", "group_name": "Family" }';
     $response = new FaceResponse($request, $body, 200, []);
     /** @var \FaceSDK\Node\Group $groupInfo */
     $groupInfo = $response->getGroupInfo();
     $this->assertInstanceOf('\\FaceSDK\\Node\\Group', $groupInfo);
     $personList = $groupInfo->getPersons();
     $this->assertEquals('Alice', $personList[0]->getName());
 }