public function testInvalidUserDataIdSkillAssocsCreate()
 {
     $validSkillId = 11;
     $invalidUserDataId = -3;
     $s1 = new SkillAssocs($invalidUserDataId, $validSkillId);
     $this->assertTrue(!empty($s1->getError('userDataId')) && strcmp(Messages::getError('USER_DATA_ID_INVALID'), $s1->getError('userDataId')) == 0, 'It should have a userDataId error if the userDataId is invalid');
 }