Fix a WebSocket crash.

tests/standalone/io/web_socket_test.dart

Index: tests/standalone/io/web_socket_test.dart
diff --git a/tests/standalone/io/web_socket_test.dart b/tests/standalone/io/web_socket_test.dart
index f3213e672572008a5ff98e33d50dca8e06852575..489b267f12d5eda961486b6accb846cd8ed04241 100644
--- a/tests/standalone/io/web_socket_test.dart
+++ b/tests/standalone/io/web_socket_test.dart
@@ -187,6 +187,21 @@ class SecurityConfiguration {
   }
 
 
+  void testCancelThenClose() {
+    createServer().then((server) {
+      server.transform(new WebSocketTransformer()).listen((webSocket) {
+        webSocket.listen(null).cancel();

[Anders Johnsen, 2015/07/15 06:32:48]

Can you add a test where you close before cancel?

[nweiz, 2015/07/15 20:29:34]

Done.

[Anders Johnsen, 2015/07/20 11:59:21]

Cool, thank you!

+        webSocket.close();
+        server.close();
+      });
+
+      createClient(server.port).then((webSocket) {
+        webSocket.close();
+      });
+    });
+  }
+
+
   void testListenAfterClose() {
     createServer().then((server) {
       server.transform(new WebSocketTransformer()).listen((webSocket) {
@@ -543,6 +558,7 @@ class SecurityConfiguration {
     testMessageLength(65535);
     testMessageLength(65536);
     testCloseNoListen();
+    testCancelThenClose();
     testListenAfterClose();
     testDoubleCloseClient();
     testDoubleCloseServer();