Remove proxy-related environment variables when running standalone tests

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 15 matching lines @@
 
 const int NO_TIMEOUT = 0;
 const int SLOW_TIMEOUT_MULTIPLIER = 4;
 
 const int CRASHING_BROWSER_EXITCODE = -10;
 
 typedef void TestCaseEvent(TestCase testCase);
 typedef void ExitCodeEvent(int exitCode);
 typedef void EnqueueMoreWork(ProcessQueue queue);
 
+const List<String> EXCLUDED_ENVIRONMENT_VARIABLES =

[ricow1, 2013/04/12 14:39:09]

Please add a statement here as to why we do this

+    const ['http_proxy', 'https_proxy', 'no_proxy',
+           'HTTP_PROXY', 'HTTPS_PROXY', 'NO_PROXY'];
+
 
 /**
  * [areByteArraysEqual] compares a range of bytes from [buffer1] with a
  * range of bytes from [buffer2].
  *
  * Returns [true] if the [count] bytes in [buffer1] (starting at
  * [offset1]) match the [count] bytes in [buffer2] (starting at
  * [offset2]).
  * Otherwise [false] is returned.
  */
@@ skipping 969 matching lines @@
     source.listen(destination.addAll);
   }
 
   io.ProcessOptions _createProcessOptions() {
     var baseEnvironment = command.environment != null ?
         command.environment : io.Platform.environment;
     io.ProcessOptions options = new io.ProcessOptions();
     options.environment = new Map<String, String>.from(baseEnvironment);
     options.environment['DART_CONFIGURATION'] =
         TestUtils.configurationDir(testCase.configuration);
+
+    for (var excludedEnvironmentVariable in EXCLUDED_ENVIRONMENT_VARIABLES) {
+      options.environment.remove(excludedEnvironmentVariable);
+    }
+
     return options;
   }
 }
 
 class BatchRunnerProcess {
   Command _command;
   String _executable;
   List<String> _batchArguments;
 
   io.Process _process;
@@ skipping 687 matching lines @@
     }
   }
 
   void eventAllTestsDone() {
     for (var listener in _eventListener) {
       listener.allDone();
     }
   }
 }