Add a timeout to scheduled pub tests.

utils/tests/pub/test_pub.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.
 
 /**
  * Test infrastructure for testing pub. Unlike typical unit tests, most pub
  * tests are integration tests that stage some stuff on the file system, run
  * pub, and then validate the results. This library provides an API to build
  * tests like that.
  */
@@ skipping 491 matching lines @@
 
 /// The list of events that are scheduled to run after the test case only if it
 /// failed.
 List<_ScheduledEvent> _scheduledOnException;
 
 /**
  * Set to true when the current batch of scheduled events should be aborted.
  */
 bool _abortScheduled = false;
 
+/// The time (in milliseconds) to wait for the entire scheduled test to
+/// complete.
+final _TIMEOUT = 30000;
+
 /**
  * Runs all the scheduled events for a test case. This should only be called
  * once per test case.
  */
 void run() {
   var createdSandboxDir;
 
   var asyncDone = expectAsync0(() {});
 
   Future cleanup() {
@@ skipping 20 matching lines @@
     subFuture.handleException((e) {
       print("Exception while cleaning up: $e");
       print(subFuture.stackTrace);
       registerException(error, subFuture.stackTrace);
       return true;
     });
     subFuture.then((_) => registerException(error, future.stackTrace));
     return true;
   });
 
-  future.chain((_) => cleanup()).then((_) {
-    asyncDone();
-  });
+  timeout(future, _TIMEOUT, 'waiting for a test to complete')
+      .chain((_) => cleanup())
+      .then((_) => asyncDone());
 }
 
 /// Get the path to the root "util/test/pub" directory containing the pub tests.
 String get testDirectory {
   var dir = new Options().script;
   while (basename(dir) != 'pub') dir = dirname(dir);
 
   return getFullPath(dir);
 }
 
@@ skipping 1101 matching lines @@
 /// calling [completion] is unnecessary.
 void expectLater(Future actual, matcher, {String reason,
     FailureHandler failureHandler, bool verbose: false}) {
   _schedule((_) {
     return actual.transform((value) {
       expect(value, matcher, reason: reason, failureHandler: failureHandler,
           verbose: false);
     });
   });
 }