Test directive attribute without template

I'm trying to run a few unit tests on an Angular directive which is restricted to an Attribute. For now I'm only trying to ascertain that the directive exists.

Does anyone know how to test a directive that is an attribute only?

Here is a bare bones version of the directive

function ResetCustomer() {
  return {
    restrict: 'A',
    link: (scope, elem) => {

      elem.bind('click', function() {
        //do stuff
      });
    }
  };
}

export default {
  name: 'resetCustomer',
  fn: ResetCustomer
};

... the HTML

<a class="brand" reset-customer>
   <img src="path/to/image.jpg"/>
</a>

...and the test

describe('Unit: ResetCustomer', () => {

  let element, scope, compile;

  beforeEach(() => {
    angular.mock.module('app');
    angular.mock.inject(($compile, $rootScope) => {
      scope = $rootScope.$new();
      compile = $compile;
      element = angular.element('<a reset-customer></a>');
      compile(element)(scope);
      scope.$digest();
    });
  });

  it('should exist', () => {
    expect(element).toBeDefined();
  }); 
});