Can't mock return from ember-data destroyRecord for testing

I'm trying to test deleting a user account using fauxjax and ember-data. I am getting this error back: Assertion Failed: Expected an object as 'data' in a call to 'push' @model:user: , but was undefined

I can't find what to do in this case with testing. Here is my test and code:

Test:

test('delete user account', function(assert) {
  loginUser();
  $.fauxjax.new({
      request: {
      type: 'GET',
      url: ENV.apiDomain.concat('/users/1'),
      dataType: 'json',
      headers: {Authorization: 'abc123'}
    },
    response: {
      content: {}
    }
  });

  visit('/account/delete');

  click('#yes');
  andThen(function() {
    assert.equal(currentPath(), 'index');
  });
});

and my action:

confirmDelete: function() {
  var controller = this;
  this.store.find('user', localStorage.userId).then(function(user){
    user.destroyRecord();
    controller.send('logout');
  });
},