anchor.diff:      }
       stdout.close();
       stderr.close();
  -    if (_failedTests > 0) exit(1);
  +    if (_failedTests > 0) {
  +      io.exitCode = 1;
  +    }
     }
   
     void allTestsKnown() {
  
positive.code:     _printTimingInformation();
      stdout.close();
      stderr.close();
      if (_failedTests > 0) exit(1);
    }
  
    void _printStartProgress(TestCase test) {}
  
negative.code: library test_progress;
  
  import "dart:io";
  import "dart:io" as io;
  import "http_server.dart" as http_server;
  import "status_file_parser.dart";
  import "test_runner.dart";
  