/**
* @param \PHPUnit_Framework_MockObject_MockObject|Zend_Db_Adapter_Abstract $adapter
* @depends testSetAddOrder
*/
public function testUnshiftOrder($adapter)
{
$this->collection->setConnection($adapter);
$this->collection->addOrder('some_field', \Magento\Framework\Data\Collection::SORT_ORDER_ASC);
$this->collection->unshiftOrder('other_field', \Magento\Framework\Data\Collection::SORT_ORDER_ASC);
$this->collection->load();
$selectOrders = $this->collection->getSelect()->getPart(\Zend_Db_Select::ORDER);
$this->assertEquals('other_field ASC', (string) array_shift($selectOrders));
$this->assertEquals('some_field ASC', (string) array_shift($selectOrders));
$this->assertEmpty(array_shift($selectOrders));
}