fix code completion invocation on getter

pkg/analysis_server/test/services/completion/completion_test_util.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.completion.util;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/protocol.dart' as protocol show Element,
     ElementKind;
@@ skipping 2679 matching lines @@
       assertSuggestInvocationMethod('m', 'A', null);
       assertSuggestInvocationMethod('_n', 'A', 'I');
       assertNotSuggested('a');
       assertNotSuggested('A');
       assertNotSuggested('X');
       assertNotSuggested('Object');
       assertNotSuggested('==');
     });
   }
 
+  test_PrefixedIdentifier_getter() {
+    // SimpleIdentifier  PrefixedIdentifier  ExpressionStatement
+    addTestSource('String get g => "one"; f() {g.^}');
+    computeFast();
+    return computeFull((bool result) {
+      assertSuggestInvocationGetter('length', 'int');
+    });
+  }
+
   test_PrefixedIdentifier_library() {
     // SimpleIdentifier  PrefixedIdentifier  ExpressionStatement
     addSource('/testB.dart', '''
       lib B;
       var T1;
       class X { }
       class Y { }''');
     addTestSource('''
       import "/testB.dart" as b;
       var T2;
@@ skipping 272 matching lines @@
       assertNotSuggested('bar2');
       assertNotSuggested('_B');
       assertSuggestLocalClass('Y');
       assertSuggestLocalClass('C');
       assertSuggestLocalVariable('f', null);
       assertNotSuggested('x');
       assertNotSuggested('e');
     });
   }
 }