anchor.diff:          +0 -1: failure 1
             oh no
             test.dart 6:33  main.<fn>
  -          dart:isolate    _RawReceivePortImpl._handleMessage
   
   
           +0 -1: failure 2
           +0 -2: failure 2
             oh no
             test.dart 7:33  main.<fn>
  -          dart:isolate    _RawReceivePortImpl._handleMessage
   
   
           +0 -2: failure 3
           +0 -3: failure 3
             oh no
             test.dart 8:33  main.<fn>
  -          dart:isolate    _RawReceivePortImpl._handleMessage
   
   
           +0 -3: Some tests failed.""");
  
positive.code:         +1 -2: failure 2
            oh no
            test.dart 8:33  main.<fn>
            dart:isolate    _RawReceivePortImpl._handleMessage
  
  
          +1 -2: success 2
  
negative.code:         +0 -1: failure 1
            oh no
            test.dart 6:33  main.<fn>
  
  
          +0 -1: success 1
  