void TestInstrumentChange::testDelete()
      {
      Score* score = test_pre("delete");
      Measure* m = score->firstMeasure()->nextMeasure();
      Segment* s = m->first(Segment::Type::ChordRest);
      InstrumentChange* ic = static_cast<InstrumentChange*>(s->annotations()[0]);
      score->deleteItem(ic);
      score->doLayout();
      test_post(score, "delete");
      }