jest mock

gistfile1.txt

let data;
let errorMessage;

const analyseImageWithVibrant = jest.fn(
  () => new Promise((resolve, reject) => {
    if (data) {
      resolve(data);
    } else {
      reject(errorMessage);
    }
  }),
);

export default analyseImageWithVibrant;

// eslint-disable-next-line no-underscore-dangle
export const __setData = (d, message) => {
  data = d;
  errorMessage = message;
};