greed/__mocks__/fetch.js

graphql client

const person = {
  2: {
    data: {
      person: {
        name: "C-3PO",
        species: {
          name: "Droid"
        }
      }
    }
  }
};

export default function fetch (path, networkObject) {
  return new Promise((resolve, reject) => {
      person[networkObject.body.variables.personID] ? resolve(person[networkObject.body.variables.personID]) : reject({
        error: 'Person with ' + person[networkObject.body.variables.personID] + ' not found.',
      })
  });
}