old_contents: describe('the fetch-location canary test', () => {
    it('shows the infrastructure works', () => {
      true.should.equal(true);
    });
  
    describe('fetch location should', () => {
      it('retrieve the latitude and longitude');
    });
  });
  
new_contents: import {fetchLocation} from './fetch-location';
  
  describe('the fetch-location canary test', () => {
    it('shows the infrastructure works', () => {
      true.should.equal(true);
    });
  
    describe('fetch location should', () => {
      it('retrieve the latitude and longitude', function(done)  {
        const onSuccess = location => {
          window.console.log(location);
          location.should.have.property('lat');
          location.should.have.property('long');
        };
  
        fetchLocation(onSuccess);
      });
    });
  });
  
subject: make test fail