javascript - Stub an internal functions? -


i want stub internal function in code when unit testing it, example:

//foobar.js const uuid = require('uuid');  function foo() {     console.log('uuid: ' + uuid.v4());     // lots of timers } exports._foo = foo;  function bar() {     //logic...     foo();     //logic... } exports.bar = bar;

and unit test:

// test/foobar.js const chai = require('chai'),     expect = chai.expect,     proxyquire = require('proxyquire'),     sinon = require('sinon');  describe('bar', () => {     it('call foo', () => {         let foo = proxyquire('./foo.js', {                 uuid: {                     v4: () => {                         return '123456789';                     }                 }             }),             foospy = sinon.spy(foo._foo);          foo.bar();         expect(foospy.calledonce);     }); });

now, when unit testing bar, can spy on foo fine, , quite fine.
however, real foo make lot of time consuming calls (db calls, file io...), , while use proxyquire stub fs , db calls terminate immediately, duplicate code test of foo, unreadable, , being bad altogether.

the simple solution stub foo, proxyquire doesn't seems that. naive foo._foo = stubfoo didn't worked either. rewire doesn't seems handle either.

what make file import , export foobar.js, , use proxyquire on it, idea bad.

how can stub foo function when testing bar?


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