public function testArguments2()
{
$f = new gtFunction('version_compare');
$f->setArgumentNames();
$m = $f->getMandatoryArgumentNames();
$o = $f->getOptionalArgumentNames();
$this->assertEquals($m[0], 'ver1');
$this->assertEquals($m[1], 'ver2');
$this->assertEquals($o[0], 'oper');
}