demo.js

'use strict';

global.Promise = global.Promise || require('bluebird');

var request = require('request'),
  fetch = require('node-fetch');

exports.getRequest = function getRequest() {
  return new Promise(function (resolve, reject) {
    request({
      url: 'https://api.whatever.co/items',
      headers: {
        'X-Foo': 'lolwhatever'
      },
      json: true
    }, function (err, resp, body) {
      if (err) {
        return reject(err);
      }
      return resolve(body);
    });
  });
};

exports.getFetch = function getFetch() {
  return fetch('https://api.whatever.co/items', {
    headers: {
      'X-Foo': 'lolwhatever'
    }
  })
  .then(function (response) {
    return response.json();
  });
};

spec.js

'use strict';

var nock = require('nock'),
  getters = require('../');

describe('fetching', function () {
  it('getRequest gets the stuff', function (done) {
    var scope = nock('https://api.whatever.co', {
        reqheaders: {
          'X-Foo': 'lolwhatever'
        }
      })
      .get('/items')
      .reply(200, [{ sku: '123' }, { sku: '456' }])

    getters.getRequest().then(function (resp) {
      scope.done();
      done();
    });
  });

  it('getFetch works without headers', function (done) {
    var scope = nock('https://api.whatever.co')
      .get('/items')
      .reply(200, [{ sku: '123' }, { sku: '456' }])

    getters.getFetch().then(function (resp) {
      scope.done();
      done();
    })
    .catch(function (err) {
      console.error(err.stack);
      throw err;
    });
  });

  it('getFetch gets the stuff', function (done) {
    var scope = nock('https://api.whatever.co', {
        reqheaders: {
          'X-Foo': 'lolwhatever'
        }
      })
      .get('/items')
      .reply(200, [{ sku: '123' }, { sku: '456' }])

    getters.getFetch().then(function (resp) {
      scope.done();
      done();
    })
    .catch(function (err) {
      console.error(err.stack);
      throw err;
    });
  });
});

test output

  fetching
    ✓ getRequest gets the stuff
    ✓ getFetch works without headers
Error: request to https://api.whatever.co/items failed, reason: Nock: No match for request GET https://api.whatever.co/items
    at OverriddenClientRequest.<anonymous> (/Users/ken/ksheedlo/basic-nock/node_modules/node-fetch/index.js:117:11)
    at OverriddenClientRequest.emit (events.js:107:17)
    at /Users/ken/ksheedlo/basic-nock/node_modules/nock/lib/request_overrider.js:202:11
    at process._tickCallback (node.js:355:11)
    1) getFetch gets the stuff


  2 passing (2s)
  1 failing

  1) fetching getFetch gets the stuff:
     Error: timeout of 2000ms exceeded. Ensure the done() callback is being called in this test.