Stub a call in a separate file that is being required

Using proxyquire, sinon, and mocha.

I am able to stub fetch on the first call of fetch. But on the second fetch call, I am not able to stub it because it is in the separate file alerts.js and has it's own require('node-fetch');

How do I stub both of these fetch calls so I can count them?

index.js

sendAlert = require('alerts').sendAlert;

function init() {
  fetch(darkWeatherUrl)
    .then(()> {
       sendAlert();
     });
}

---

alerts.js

function sendAlert() {
  fetch(request)
    .then(...)
}

---

test:

describe('lifx alert test', ()=> {
  var fetchStub1;

  beforeEach(() => {
    fetchStub1 = sinon.stub();
  });

  it('fetch should of called twice', ()=> {

    var body = {
      "hourly": {
         data: 
           [ { time: 1493413200,
              icon: 'clear-day',
              precipIntensity: 0,
              precipProbability: 0,
              ozone: 297.17 }]
        }
    };

    var response = { json: () => { return body } };
    fetchStub1.returns(Promise.resolve(response));
    proxy('../index.js', {
        'node-fetch': fetchStub1
      },
      {'../alerts' : {
        'node-fetch': fetchStub1
      }
    });
    fetchStub1.should.have.been.callCount(2);
  });

});

---

  1) lifx alert test fetch should of called twice:

     expected stub to have been called exactly twice, but it was called once
    stub(https://api.darksky.net/forecast/580c/37.267,-12.433) => [Promise] {  } at init (/home/one/github/lifx-weather/index.js:23:3)
  AssertionError: expected stub to have been called exactly twice, but it was called once
      stub(https://api.darksky.net/forecast/5/3.87,-22.43) => [Promise] {  } at init (index.js:23:3)
      at Context.it (test/foo.js:45:33)

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