anchor.diff:    }
   
     test_class_codeRange() {
  -    if (!includeInformative) return;
       UnlinkedClass cls = serializeClassText(' class C {}');
       _assertCodeRange(cls.codeRange, 1, 10);
     }
  
positive.code:   }
  
    test_enum_documented() {
      if (!includeInformative) return;
      String text = '''
  // Extra comment so doc comment offset != 0
  /**
  
negative.code:   }
  
    test_unit_codeRange() {
      serializeLibraryText('  int a = 1;  ');
      UnlinkedUnit unit = unlinkedUnits[0];
      _assertCodeRange(unit.codeRange, 0, 14);
  