Fix incremental element builder for added enums.

pkg/analyzer/test/src/task/incremental_element_builder_test.dart

 // Copyright (c) 2015, 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 analyzer.test.src.task.incremental_element_builder_test;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/visitor.dart';
 import 'package:analyzer/src/dart/ast/utilities.dart';
@@ skipping 1433 matching lines @@
     CompilationUnitMember nodeA = newNodes[0];
     CompilationUnitMember nodeB = newNodes[1];
     expect(nodeA, same(oldNodes[0]));
     // elements
     ClassElement elementA = nodeA.element;
     ClassElement elementB = nodeB.element;
     expect(elementA, isNotNull);
     expect(elementB, isNotNull);
     expect(elementA.name, 'A');
     expect(elementB.name, 'B');
+    expect(elementA.fields.map((f) => f.name),
+        unorderedEquals(['index', 'values', 'A1', 'A2']));
+    expect(elementA.accessors.map((a) => a.name),
+        unorderedEquals(['index', 'values', 'A1', 'A2']));
+    expect(elementB.fields.map((f) => f.name),
+        unorderedEquals(['index', 'values', 'B1', 'B2']));
+    expect(elementB.accessors.map((a) => a.name),
+        unorderedEquals(['index', 'values', 'B1', 'B2']));
     // unit.types
     expect(unitElement.enums, unorderedEquals([elementA, elementB]));
     // verify delta
     expect(unitDelta.addedDeclarations, unorderedEquals([elementB]));
     expect(unitDelta.removedDeclarations, unorderedEquals([]));
   }
 
   test_unitMembers_function_add() {
     _buildOldUnit(r'''
 a() {}
@@ skipping 592 matching lines @@
           unitMember is ClassDeclaration && unitMember.name.name == name);
 }
 
 class _MaterializeLazyElementsVisitor extends GeneralizingElementVisitor {
   @override
   visitExecutableElement(ExecutableElement element) {
     element.parameters;
     super.visitExecutableElement(element);
   }
 }