Improve test_runner_test.

tests/standalone/io/test_runner_test.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.
 
 import "dart:io";
 import "dart:isolate";
 import "dart:async";
 import "../../../tools/testing/dart/test_runner.dart";
 import "../../../tools/testing/dart/test_suite.dart";
 import "../../../tools/testing/dart/test_progress.dart" as progress;
@@ skipping 12 matching lines @@
   static processCompletedTest(TestCase testCase) {
     numCompletedTests++;
     if (testCase.displayName == "fail-unexpected") {
       if (!testCase.unexpectedOutput) {
         var stdout =
             new String.fromCharCodes(testCase.lastCommandOutput.stdout);
         var stderr =
             new String.fromCharCodes(testCase.lastCommandOutput.stderr);
         print("stdout = [$stdout]");
         print("stderr = [$stderr]");
-        throw "Expected fail-unexpected: ${testCase.result}";
+        throw "Test case ${testCase.displayName} passed unexpectedly, "
+            "result == ${testCase.result}";

[kustermann, 2014/06/16 08:26:29]

Indentation.

       }
     } else {
       if (testCase.unexpectedOutput) {
         var stdout =
             new String.fromCharCodes(testCase.lastCommandOutput.stdout);
         var stderr =
             new String.fromCharCodes(testCase.lastCommandOutput.stderr);
         print("stdout = [$stdout]");
         print("stderr = [$stderr]");
-        throw "Unexpected fail";
+        throw "Test case ${testCase.displayName} failed, "
+            "result == ${testCase.result}";

[kustermann, 2014/06/16 08:26:29]

ditto.

       }
     }
   }
 
   static void finished() {
     if (numTests != numCompletedTests) {
       throw "bad completion count. "
             "expected: $numTests, actual: $numCompletedTests";
     }
   }
@@ skipping 87 matching lines @@
         break;
       case 'timeout':
         // This process should be killed by the test after DEFAULT_TIMEOUT
         new Timer(new Duration(hours: 42), (){ });
         break;
       default:
         throw "Unknown option ${arguments[0]} passed to test_runner_test";
     }
   }
 }