setup.js

Function.prototype.compile = function() {
  var template = this.toString().split('\n').slice(1,-1).join('\n') + '\n';
  return Ember.Handlebars.compile(template);
}

/*******************************************************/

test('sets first tab found to active', function() {
  expect(2);
  var component = this.subject({
    template: function(){/*
      {{#ic-tab-list}}
        {{ic-tab id="tab1"}}
        {{ic-tab id="tab2"}}
      {{/ic-tab-list}}
      {{#ic-tab-panel}}one{{/ic-tab-panel}}
      {{#ic-tab-panel}}two{{/ic-tab-panel}}
    */}.compile()
  });
  this.append();
  var tab1 = Ember.View.views['tab1'];
  equal(component.get('activeTab'), tab1);
  ok(tab1.get('active'));
});

https://twitter.com/followchrisp/status/440397431868370945