static L<GazelleFulfillment> gazelle_testSingleRuleSingleLineFulfillment(S ruleID, S line, O... _) {
  new L<GazelleFulfillment> list;
  gazelle_gatherFulfillments(ll(nu GazelleLine(text := line)), list, 
    paramsPlus(_, ctx := gazelle_contextWithSingleRule(ruleID)));
  ret list;
}