Fix for enum signatures.

pkg/analysis_server/test/analysis/get_hover_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.domain.analysis.hover;
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
@@ skipping 78 matching lines @@
 library my.library;
 /// doc aaa
 /// doc bbb
 main() {
 }
 ''');
     HoverInformation hover = await prepareHover('main() {');
     expect(hover.dartdoc, '''doc aaa\ndoc bbb''');
   }
 
+  test_enum() async {
+    addTestFile('''
+enum MyEnum {AAA, BBB, CCC}
+''');
+    HoverInformation hover = await prepareHover('MyEnum');
+    expect(hover.elementDescription, 'enum MyEnum');
+    expect(hover.staticType, isNull);
+    expect(hover.propagatedType, isNull);
+  }
+
   test_expression_function() async {
     addTestFile('''
 library my.library;
 /// doc aaa
 /// doc bbb
 List<String> fff(int a, String b) {
 }
 ''');
     HoverInformation hover = await prepareHover('fff(int a');
     // element
@@ skipping 275 matching lines @@
     addTestFile('''
 library my.library;
 main() {
   // nothing
 }
 ''');
     HoverInformation hover = await prepareHover('nothing');
     expect(hover, isNull);
   }
 }