it('should support onInputFocus', function() {
      var mockOnFocus = sinon.spy();
      var view = TestUtils.renderIntoDocument(<TestComponent value="" onChange={mockOnChange} items={items} onInputFocus={mockOnFocus} />);
      var input = TestUtils.findRenderedDOMComponentWithTag(view, 'input');
      TestUtils.Simulate.focus(input);