Proxyquire and sinon chai - getting false positives for fetch stub

I am new to unit testing in Node. I am using sinon asserts for chai, mocha, and proxyquire.

In the function below, when I assert if fetch ran.... I get positives for both fetch.should.not.have.been.called and fetch.should.have.been.called so I know I am getting false positives.

function normalAlert() {
   ...

  fetch(request)
    .then(toJSON)
    .then((e) => {
    })
    .catch((e) => {
      console.log('error ' + e);
    });
}

---

it('should run fetch', ()=> {
  var fetch = sinon.stub();
  var alerts =  proxy('../alerts', {'fetch': fetch});

  alerts.normalAlert();
  fetch.should.have.been.called

});

via dman