使用jasmine来测试其他模块中内部调用的函数？

Question

所以我有一个情况，我有2个模块，为了参数，我们称它们为A和B.

模块A：

import C from './C';
import { shuffle } from './B';

const A_func = () => new C(shuffle([1, 2, 3, 0]));

export default A_func;

模块B：

...
export const shuffle = (array) => {
  // knuth shuffle algorithm
  // return the shuffled array
};
...

// there are other exports as well
export shuffle;

我想测试模块A，但我想监视模块B导出的shuffle方法。

A.spec.js

describe('A', () => {
  // no Idea how to create spy on shuffle
  // would like to return a predetermind array as output of shuffle
  // let's say [2, 3, 1, 0]
  // something like (which won't work)
  // spOn('shuffle').and.returnValue([2, 3, 1, 0]);
});