public function testAddGetCustomDatetimeFunction()
{
$this->configuration->addCustomDatetimeFunction('FunctionName', __CLASS__);
$this->assertSame(__CLASS__, $this->configuration->getCustomDatetimeFunction('FunctionName'));
$this->assertSame(null, $this->configuration->getCustomDatetimeFunction('NonExistingFunction'));
$this->configuration->setCustomDatetimeFunctions(array('OtherFunctionName' => __CLASS__));
$this->assertSame(__CLASS__, $this->configuration->getCustomDatetimeFunction('OtherFunctionName'));
$this->setExpectedException('Doctrine\\ORM\\ORMException');
$this->configuration->addCustomDatetimeFunction('date_add', __CLASS__);
}