public function testHelper()
{
// Without layout
$this->assertInstanceOf('Mage_Core_Helper_Data', $this->_block->helper('Mage_Core_Helper_Data'));
// With layout
$this->_block->setLayout(new Mage_Core_Model_Layout());
$helper = $this->_block->helper('Mage_Core_Helper_Data');
try {
$this->assertInstanceOf('Mage_Core_Helper_Data', $helper);
$this->assertInstanceOf('Mage_Core_Model_Layout', $helper->getLayout());
/* Helper is a 'singleton', so assigned layout may affect further helper usage */
$helper->setLayout(null);
} catch (Exception $e) {
$helper->setLayout(null);
throw $e;
}
}
