firestore-mock/mock_constructors/IdMock.js

Firestore intsance mock for the Firebase Admin SDK

const possibilities = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ".split(
  ""
);

module.exports = function createId() {
  i = 0;
  id = "";
  while (i < 20) {
    id = id + possibilities[Math.floor(Math.random() * possibilities.length)];
    i++;
  }
  return id;
};