function testGetChangesetValue_doesnt_exist()
 {
     $value_dao = new MockTracker_FormElement_Field_Value_FileDao();
     $dar = new MockDataAccessResult();
     $dar->setReturnValue('getRow', false);
     $value_dao->setReturnReference('searchById', $dar);
     $file_field = new Tracker_FormElement_Field_FileTestVersion();
     $file_field->setReturnReference('getValueDao', $value_dao);
     $changeset_value = $file_field->getChangesetValue(null, 123, false);
     $this->assertIsA($changeset_value, 'Tracker_Artifact_ChangesetValue_File');
     $this->assertEqual(count($changeset_value->getFiles()), 0);
 }