function Test_of_get_and_set_DisplayField()
{
$AkTestField = new AkTestField();
$this->assertEqual($AkTestField->getDisplayField(), 'id');
$AkTestField->setDisplayField('text_field');
$this->assertEqual($AkTestField->getDisplayField(), 'text_field');
$AkTestUser = new AkTestUser();
$this->assertEqual($AkTestUser->getDisplayField(), 'id');
$AkTestUser->addCombinedAttributeConfiguration('name', "%s %s", 'first_name', 'last_name');
$this->assertEqual($AkTestUser->getDisplayField(), 'name');
$AkTestField->setDisplayField('invalid_field');
$this->assertEqual($AkTestUser->getDisplayField(), 'name');
}
