Re-add missing space in test failed message.

tools/testing/dart/test_progress.dart

 // Copyright (c) 2013, 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 "dart:convert" show JSON;
 import "dart:io";
 
 import "path.dart";
@@ skipping 571 matching lines @@
   return decodeUtf8(output)
       .replaceAll('\r\n', '\n')
       .replaceAll('\r', '\n')
       .split('\n');
 }
 
 List<String> _buildFailureOutput(TestCase test,
     [Formatter formatter = Formatter.normal]) {
   var output = [
     '',
-    formatter.failed('FAILED: ${test.configurationString}${test.displayName}')
+    formatter.failed('FAILED: ${test.configurationString} ${test.displayName}')
   ];
 
   var expected = new StringBuffer();
   expected.write('Expected: ');
   for (var expectation in test.expectedOutcomes) {
     expected.write('$expectation ');
   }
 
   output.add(expected.toString());
   output.add('Actual: ${test.result}');
@@ skipping 70 matching lines @@
 }
 
 String _buildSummaryEnd(int failedTests) {
   if (failedTests == 0) {
     return '\n===\n=== All tests succeeded\n===\n';
   } else {
     var pluralSuffix = failedTests != 1 ? 's' : '';
     return '\n===\n=== ${failedTests} test$pluralSuffix failed\n===\n';
   }
 }