/**
* @covers \Magento\Framework\Model\ResourceModel\Db\Collection\AbstractCollection::addExpressionFieldToSelect
*/
public function testAddExpressionFieldToSelect()
{
$this->_collection->addExpressionFieldToSelect('test_alias', 'SUM({{store_id}})', 'store_id');
$this->assertContains('SUM(store_id)', (string) $this->_collection->getSelect());
$this->assertContains('test_alias', (string) $this->_collection->getSelect());
}