Unit Test: How to test ajax calls

[couchcrew-thomas]

Question: How to test calls to src/ajax in unit tests?

Description

I want to test that calls to src/ajax are called with the correct parameters for my custom adapter. The ajax request is used in the onTimeout and onBidWon callback. Because the ajax method is an exported function, it is not possible to stub it with sinon.

Example Adapter Spec

export const spec = {
  /* ... */
  onTimeout: function (timeoutData) {
    ajax('http://localhost:3000/onTimeout', null, JSON.stringify(timeoutData), {
      withCredentials: true,
      method: 'POST',
      contentType: 'application/json'
    })
  }
};

Intended Unit Test

import * as xhr from '../../../src/ajax';

/* ... */
let stub = sinon.stub(xhr, "ajax");
spec.onTimeout(something);
expect(stub.called).to.be.true;

But the above does not work because sinon cannot spy on exported functions.

[stale]

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