anchor.diff:    return newData;
   }
   
  -List _stripPrivateFieldsList(List<Map<String, dynamic>> data){
  +List stripPrivateFieldsList(List<Map<String, dynamic>> data){
     List newData = [];
     data.forEach((oldMap) {
  -    newData.add(_stripPrivateFields(oldMap));
  +    newData.add(stripPrivateFields(oldMap));
     });
     return newData;
   }
  
positive.code:   });
  }
  
  Map _stripPrivateFields(Map<String, dynamic> data){
    Map newData = {};
    data.forEach((key,value) {
      if (!key.startsWith('__')) newData[key] = value;
  
negative.code:       .then((dataDiff) {
           handleDiff(dataDiff['diff'], dataStart);
  
           expect(stripPrivateFieldsList(dataStart), equals(stripPrivateFieldsList(dataEnd)));
        });
      });
  
    });
  }
  