Babel + Angular 1 + Promises not resolving

karma.conf.js

// Reference: http://karma-runner.github.io/0.12/config/configuration-file.html
module.exports = function karmaConfig (config) {
  config.set({
    frameworks : [
      // Reference: https://github.com/karma-runner/karma-jasmine
      // Set framework to jasmine
      'jasmine'
    ],

    reporters : [
      // Reference: https://github.com/mlex/karma-spec-reporter
      // Set reporter to print detailed results to console
      'progress',

      // Reference: https://github.com/karma-runner/karma-coverage
      // Output code coverage files
      'coverage'
    ],

    files : [
      // Add the polyfill manually (THIS MAY BE THE ISSUE? Couldn't get Promise to work any other way)
      'node_modules/babel-polyfill/dist/polyfill.min.js',
      // Grab all files in the app folder that contain .spec.
      'src/tests.webpack.js'
    ],

    preprocessors : {
      // Reference: http://webpack.github.io/docs/testing.html
      // Reference: https://github.com/webpack/karma-webpack
      // Convert files with webpack and load sourcemaps
      'src/tests.webpack.js' : ['webpack', 'babel']
    },

    browsers : [
      // Run tests using PhantomJS2
      'PhantomJS'
    ],

    singleRun : true,

    // Configure code coverage reporter
    coverageReporter : {
      dir : 'coverage/',
      reporters : [
        {type : 'text-summary'},
        {type : 'html'}
      ]
    },

    webpack : require('./webpack.unit-test.config'),

    babelPreprocessor: {
      options: {
        presets: ['es2015'],
        sourceMap: 'inline'
      }
    },

    // Hide webpack build information from output
    webpackMiddleware : {
      noInfo : true
    },

    plugins: [
      require('karma-webpack'),
      require('karma-jasmine'),
      require('karma-phantomjs-launcher'),
      require('karma-coverage'),
      require('karma-spec-reporter'),
      require('karma-babel-preprocessor')
    ]
  });
};

projects.service.spec.js

// Lots of setup up here
// Removed for brevity

it('should get an individual project', function () {
    let response;

    // mockProject is just a simple JSON object
    httpBackend.expectGET('projects/' + mockProject.id).respond(mockProject);

    // Just a test to see if promise doesn't throw an error as a variable
    new Promise((resolve, reject) => {
      resolve();
    })
      .then(() => {
        // This is never fired
        console.log('resolved test');
      });

    // Now actually call it
    projectsService.getProject(mockProject.id)
      .then((project) => {
        // This is NEVER fired
        console.log('promise resolved!');
        response = project;
      });

    // Now we have to flush that http request
    httpBackend.flush();

    // Run the expect... this is always failing since response is empty
    expect(response).toEqual(mockProject);
  });

webpack.unit-test.config.js

// I've included this file just to show nothing fancy happening here.
// This is the main file that the karma.conf is bringing in (Besides the polyfill)

import 'angular';
import 'angular-mocks/angular-mocks';
// I tried to:
//  import 'babel-polyfill'
// but I got a global._babelPolyfill  error (window doesn't exist?)

var testsContext = require.context(".", true, /.spec$/);
console.log(testsContext);
testsContext.keys().forEach(testsContext);