s")       .with(headers: {         content_type: "application/vnd.api+json",         accept: "application/vnd.api+json"       },       body: {         data: {           type: "callback_tests",           attributes: {             foo: 00,             bar: 0           }         }       }.to_json)       .to_return(headers: {         content_type: "application/vnd.api+json"       },       body: {         data: {           type: "callback_tests",           id: "0",           attributes: {             foo: 00,             bar: 0           }         }       }.to_json)      