protected function setUp() { $this->_layoutMock = Mage::getModel('Mage_Core_Model_Layout'); $this->_block = $this->_layoutMock->createBlock('Mage_Backend_Block_Widget_Grid_Extended', 'grid', array('layout' => $this->_layoutMock)); $this->_block->addColumn('column1', array('id' => 'columnId1')); $this->_block->addColumn('column2', array('id' => 'columnId2')); }