function testGetChangesetValue_doesnt_exist()
 {
     $value_dao = new MockTracker_FormElement_Field_Value_DateDao();
     $dar = new MockDataAccessResult();
     $dar->setReturnValue('getRow', false);
     $value_dao->setReturnReference('searchById', $dar);
     $date_field = new Tracker_FormElement_Field_DateTestVersion();
     $date_field->setReturnReference('getValueDao', $value_dao);
     $this->assertNull($date_field->getChangesetValue(null, 123, false));
 }