Jest mock inner function

Question

I have one file called helper.js that consist of two functions

export const funcA = (key) => {
   return funcB(key)
};

export const func         


        

Answer 1

I create a kind of nameSpace to handle this issue:

let helper = {}

const funcA = (key) => {
   return helper.funcB(key)
};

const funcB = (key,prop) => {
    return someObj;
};

helper = { funcA, funcB }

module.exports = helper

and then mocking is obvious with jest.fn