// }
@Test public void should_provide_message_fields_for_first_field_in_field_custom_option() {
CustomFieldOption option = xtext.find("type", ")", CustomFieldOption.class);
MessageOptionField codeOptionField = (MessageOptionField) option.getFields().get(0);
IScope scope = scopeProvider.scope_OptionField_target(codeOptionField, reference);
Message typeMessage = xtext.find("Type", " {", Message.class);
assertThat(descriptionsIn(scope), containAllFieldsIn(typeMessage));
}