Spelling fixes e to i.

tests/lib/async/stream_state_helper.dart

Index: tests/lib/async/stream_state_helper.dart
diff --git a/tests/lib/async/stream_state_helper.dart b/tests/lib/async/stream_state_helper.dart
index eda69b92cc8a635c65ee810a93552c5c61153828..59b53db12c132ce2ead86a8f7c377842b815415d 100644
--- a/tests/lib/async/stream_state_helper.dart
+++ b/tests/lib/async/stream_state_helper.dart
@@ -144,7 +144,7 @@ class StreamProtocolTest {
     _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() {