Issue 24440. Fix for renaming libraries using 'part of' directives.

pkg/analysis_server/test/edit/refactoring_test.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.edit.refactoring;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/edit/edit_domain.dart';
 import 'package:analysis_server/src/protocol.dart';
@@ skipping 1630 matching lines @@
 library aaa.bbb.ccc;
 ''');
     return assertSuccessfulRefactoring(() {
       return sendRenameRequest('.bbb', 'my.new_name');
     },
         '''
 library my.new_name;
 ''');
   }
 
+  test_library_partOfDirective() {
+    addFile(
+        '$testFolder/my_lib.dart',
+        '''
+library aaa.bbb.ccc;
+part 'test.dart';
+''');
+    addTestFile('''
+part of aaa.bbb.ccc;
+''');
+    return assertSuccessfulRefactoring(() {
+      return sendRenameRequest('aaa.bb', 'my.new_name');
+    },
+        '''
+part of my.new_name;
+''');
+  }
+
   test_localVariable() {
     addTestFile('''
 main() {
   int test = 0;
   test = 1;
   test += 2;
   print(test);
 }
 ''');
     return assertSuccessfulRefactoring(() {
@@ skipping 217 matching lines @@
         .toRequest('0');
     return _assertErrorResposeNoIndex(request);
   }
 
   _assertErrorResposeNoIndex(Request request) async {
     Response response = await serverChannel.sendRequest(request);
     expect(response.error, isNotNull);
     expect(response.error.code, RequestErrorCode.NO_INDEX_GENERATED);
   }
 }