Allow re-running of failing tests on drt-windows

tools/testing/dart/test_runner.dart

 // Copyright (c) 2012, 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.
 
 /**
  * Classes and methods for executing tests.
  *
  * This module includes:
  * - Managing parallel execution of tests, including timeout checks.
  * - Evaluating the output of each test as pass/fail/crash/timeout.
@@ skipping 1844 matching lines @@
       var runningProcess = new RunningProcess(testCase, command);
       runningProcess.start().then((CommandOutput commandOutput) {
         if (isLastCommand) {
           // NOTE: We need to call commandOutput.unexpectedOutput here.
           // Calling this getter may result in the side-effect, that
           // commandOutput.requestRetry is set to true.
           // (BrowserCommandOutputImpl._failedBecauseOfMissingXDisplay
           // does that for example)
           // TODO(ricow/kustermann): Issue 8206
           var unexpectedOutput = commandOutput.unexpectedOutput;
-          if (allowRetry && testCase.usesWebDriver
-              && unexpectedOutput
-              && (testCase as BrowserTestCase).numRetries > 0) {
-            // Selenium tests can be flaky. Try rerunning.
-            commandOutput.requestRetry = true;
+          if (unexpectedOutput && allowRetry) {
+            if (testCase.usesWebDriver
+                && (testCase as BrowserTestCase).numRetries > 0) {
+              // Selenium tests can be flaky. Try rerunning.
+              commandOutput.requestRetry = true;
+            }
+            // FIXME(kustermann): Remove this condition once we figured out why
+            // content_shell is sometimes not able to fetch resources from the
+            // HttpServer.
+            var configuration  = testCase.configuration;
+            if (configuration['runtime'] == 'drt' &&
+                configuration['system'] == 'windows' &&
+                (testCase as BrowserTestCase).numRetries > 0) {
+              assert(TestUtils.isBrowserRuntime(configuration['runtime']));
+              commandOutput.requestRetry = true;
+            }
           }
         }
         if (commandOutput.requestRetry) {
           commandOutput.requestRetry = false;
           (testCase as BrowserTestCase).numRetries--;
           DebugLogger.warning("Rerunning Test: ${testCase.displayName} "
                               "(${(testCase as BrowserTestCase).numRetries} "
                               "attempt(s) remains) [cmd:$command]");
           runCommand();
         } else {
@@ skipping 33 matching lines @@
     }
   }
 
   void eventAllTestsDone() {
     for (var listener in _eventListener) {
       listener.allDone();
     }
   }
 }