Issue 25538. Fix for notification and private methods.

pkg/analysis_server/test/analysis_abstract.dart

 // Copyright (c) 2014, 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 test.domain.analysis.abstract;
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:analysis_server/src/analysis_server.dart';
@@ skipping 14 matching lines @@
 
 import 'mock_sdk.dart';
 import 'mocks.dart';
 
 int findIdentifierLength(String search) {
   int length = 0;
   while (length < search.length) {
     int c = search.codeUnitAt(length);
     if (!(c >= 'a'.codeUnitAt(0) && c <= 'z'.codeUnitAt(0) ||
         c >= 'A'.codeUnitAt(0) && c <= 'Z'.codeUnitAt(0) ||
-        c >= '0'.codeUnitAt(0) && c <= '9'.codeUnitAt(0))) {
+        c >= '0'.codeUnitAt(0) && c <= '9'.codeUnitAt(0) ||
+        c == '_'.codeUnitAt(0))) {
       break;
     }
     length++;
   }
   return length;
 }
 
 /**
  * An abstract base for all 'analysis' domain tests.
  */
@@ skipping 180 matching lines @@
   }
 
   /**
    * Completes with a successful [Response] for the given [request].
    * Otherwise fails.
    */
   Future<Response> waitResponse(Request request) async {
     return serverChannel.sendRequest(request);
   }
 }