'Test the behavior of render_reorderable_children.'

def test_render_reorderable_children(self):

    reorderable_items = set()
    context = {'reorderable_items': reorderable_items, 'read_only': False, 'root_xblock': self.vertical}
    self.module_system.render(self.vertical, AUTHOR_VIEW, context).content
    self.assertIn(self.vertical.get_children()[0].location, reorderable_items)
    self.assertIn(self.vertical.get_children()[1].location, reorderable_items)
