public function testGetPlaceholder()
{
$model = new Mage_Catalog_Model_Product();
$this->_helper->init($model, 'image');
$placeholder = $this->_helper->getPlaceholder();
$this->assertEquals('Mage_Catalog::images/product/placeholder/image.jpg', $placeholder);
// test that placeholder doesn't change, once initialized
$model->setDestinationSubDir('other_image');
$this->assertEquals($placeholder, $this->_helper->getPlaceholder());
}
