| Index: tests/standalone/io/web_socket_protocol_processor_test.dart | 
| diff --git a/tests/standalone/io/web_socket_protocol_processor_test.dart b/tests/standalone/io/web_socket_protocol_processor_test.dart | 
| index ee66f069655f8f7b066275fee5c86dab6ee36253..eb15db0ad0180c4dad8afffce45c724e70120447 100644 | 
| --- a/tests/standalone/io/web_socket_protocol_processor_test.dart | 
| +++ b/tests/standalone/io/web_socket_protocol_processor_test.dart | 
| @@ -51,7 +51,10 @@ class WebSocketMessageCollector { | 
| } | 
|  | 
| void onError(e) { | 
| -    Expect.fail("Unexpected error $e"); | 
| +    String msg = "Unexpected error $e"; | 
| +    var trace = getAttachedStackTrace(e); | 
| +    if (trace != null) msg += "\nStackTrace: $trace"; | 
| +    Expect.fail(msg); | 
| } | 
|  | 
| } | 
|  |