Could you also add a test that ensures the deprecation warning? Something like (total pseudo code):

```javascript
test("{{bindAttr}} is deprecated", function(){
  var originalBindAttr = Ember.Handlebars.helpers['bind-attr'];

  Ember.Handlebars.helpers['bind-attr'] = function() {};

  expectAssertion(function(){
    Ember.Handlebars.helpers.bindAttr('foo', 'bar');
  });

  Ember.Handlebars.helpers['bind-attr'] = originalBindAttr;
});
```