nativefier/src/options/asyncConfig.test.js

import asyncConfig from './asyncConfig';
import fields from './fields';

jest.mock('./fields');

fields.mockImplementation(() => [Promise.resolve({
  someField: 'newValue',
})]);

test('it should merge the result of the promise', () => {
  const param = { another: 'field', someField: 'oldValue' };
  const expected = { another: 'field', someField: 'newValue' };

  return asyncConfig(param).then((result) => {
    expect(result).toEqual(expected);
  });
});