fix invocation completion test

pkg/analysis_server/test/services/search/hierarchy_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.services.src.search.hierarchy;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/services/index/index.dart';
 import 'package:analysis_server/src/services/index/local_memory_index.dart';
@@ skipping 202 matching lines @@
   B.named() {}
   var mb1;
   mb2() {}
 }
 ''');
     {
       ClassElement classA = findElement('A');
       List<Element> members = getMembers(classA);
       expect(
           members.map((e) => e.name),
-          unorderedEquals(['ma1', 'ma2', '==', 'toString']));
+          unorderedEquals(['ma1', 'ma2', '==', 'toString', 'hashCode']));
     }
     {
       ClassElement classB = findElement('B');
       List<Element> members = getMembers(classB);
       expect(
           members.map((e) => e.name),
-          unorderedEquals(['mb1', 'mb2', 'ma1', 'ma2', '==', 'toString']));
+          unorderedEquals(['mb1', 'mb2', 'ma1', 'ma2', '==', 'toString', 'hashCode']));
     }
   }
 
   Future test_getSubClasses() {
     _indexTestUnit('''
 class A {}
 class B extends A {}
 class C extends B {}
 class D extends B implements A {}
 class M {}
@@ skipping 72 matching lines @@
       Set<ClassElement> supers = getSuperClasses(classF);
       expect(supers, unorderedEquals([objectElement, classA]));
     }
   }
 
   void _indexTestUnit(String code) {
     resolveTestUnit(code);
     index.indexUnit(context, testUnit);
   }
 }