QUnit: Expect Error During Test

I'm writing an integration test that checks if a form displays errors. The assertions pass, but I get the error: <DS.Errors:ember1402>. Since this is expected behavior, how should I handle this?

test('users cannot create an empty level', function() {
  visit('/collaborate/game/430/levels/new');
  click('.submit-level'); // I submit it without filling anything in

  andThen(function() {
    var errorText = find('.error').text();
    var blankText = errorText.match(/can't be blank/);

    // these pass:
    notEqual(errorText.length, 0);
    equal(blankText.length, 1);
  });
});

I saw throws in the QUnit API Docs, so I added throws to my test:

test('users cannot create an empty level', function() {
  visit('/collaborate/game/430/levels/new');
  throws(function() {
    click('.submit-level');
  }, 'has thrown an error');

  andThen(function() {
    var errorText = find('.error').text();
    var blankText = errorText.match(/can't be blank/);

    notEqual(errorText.length, 0);
    equal(blankText.length, 1);
  });
});

This simply throws another error. I want to either expect the error, or simply ignore it.

How do I handle expected errors in my tests?