public function Test_of_validatesPresenceOf()
{
$Person = new TestPerson();
$Person->validatesPresenceOf('user_name');
$this->assertEqual($Person->getErrorsOn('user_name'), $Person->getDefaultErrorMessageFor('blank'));
$Person = new TestPerson();
$Person->validatesPresenceOf('user_name', 'is a compulsory field');
$this->assertEqual($Person->getErrorsOn('user_name'), 'is a compulsory field');
$Person->clearErrors();
$Person->set('user_name', 'bermi');
$this->assertFalse($Person->hasErrors());
}
