Dart test scripts: fix progress time indication.

tools/testing/dart/test_progress.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #library("test_progress");
 
 #import("test_runner.dart");
 
 class ProgressIndicator {
   ProgressIndicator() : _startTime = new Date.now();
@@ skipping 51 matching lines @@
     } else if (time < 10) {
       return '0$time';
     } else {
       return '$time';
     }
   }
 
   String _timeString() {
     Duration d = (new Date.now()).difference(_startTime);
     var min = d.inMinutes;
-    var sec = d.inSeconds;
+    var sec = d.inSeconds % 60;
     return '${_padTime(min)}:${_padTime(sec)}';
   }
 
   void _printFailureOutput(TestCase test) {
     print('\nFAILED: ${test.displayName}');
     StringBuffer expected = new StringBuffer();
     expected.add('Expected: ');
     for (var expectation in test.expectedOutcomes) {
       expected.add('$expectation ');
     }
@@ skipping 114 matching lines @@
     var status = 'pass';
     if (test.output.unexpectedOutput) {
       status = 'fail';
     }
     var percent = ((_completedTests() / _foundTests) * 100).toInt().toString();
     print('Done ${test.displayName}: $status');
     print('@@@STEP_CLEAR@@@');
     print('@@@STEP_TEXT@ $percent% +$_passedTests -$_failedTests @@@');
   }
 }