Spelling fixes e to i.

tests/lib/async/stream_state_helper.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 stream_state_helper;
 
 import "package:unittest/unittest.dart";
 import "dart:async";
 import "dart:collection";
 
@@ skipping 126 matching lines @@
 
   void resume() {
     _latestSubscription.resume();
   }
 
   void cancel() {
     _latestSubscription.cancel();
     _latestSubscription = null;
   }
 
-  // End the test now. There must be no open expectations, and no furter
+  // End the test now. There must be no open expectations, and no further
   // expectations will be allowed.
   // Called automatically by an onCancel event on a non-broadcast stream.
   void terminate() {
     if (_nextExpectationIndex != _expectations.length) {
       _withNextExpectation((Event expect) {
         _fail("Expected: $expect\n"
             "Found   : Early termination.\n${expect._stackTrace}");
       });
     }
     _onComplete();
@@ skipping 438 matching lines @@
   }
 
   bool _testBroadcastCancel() {
     _actual = "*[BroadcastCancel]";
     return true;
   }
 
   /** Returns a representation of the event it was tested against. */
   String toString() => _actual;
 }