public function testSetViewModelException()
{
$grid = new Datagrid();
$grid->getViewModel();
$customView = $this->getMock('Zend\\View\\Model\\ViewModel');
$this->setExpectedException('Exception', 'A viewModel is already set. Did you already called $grid->render() or $grid->getViewModel() before?');
$grid->setViewModel($customView);
}
