Fix for summarizing triple slash documentation comments.

pkg/analyzer/test/src/summary/summary_common.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.summary.summary_common;
 
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/error/listener.dart';
 import 'package:analyzer/src/dart/scanner/reader.dart';
@@ skipping 1285 matching lines @@
 // Extra comment so doc comment offset != 0
 /**
  * Docs
  */
 class C {}''';
     UnlinkedClass cls = serializeClassText(text);
     expect(cls.documentationComment, isNotNull);
     checkDocumentationComment(cls.documentationComment, text);
   }
 
+  test_class_documented_tripleSlash() {
+    if (!includeInformative) return;
+    String text = '''
+/// aaa
+/// bbbb
+/// cc
+class C {}''';
+    UnlinkedClass cls = serializeClassText(text);
+    UnlinkedDocumentationComment comment = cls.documentationComment;
+    expect(comment, isNotNull);
+    expect(comment.text, '/// aaa\n/// bbbb\n/// cc');
+  }
+
   test_class_documented_with_references() {
     if (!includeInformative) return;
     String text = '''
 // Extra comment so doc comment offset != 0
 /**
  * Docs referring to [D] and [E]
  */
 class C {}
 
 class D {}
@@ skipping 9169 matching lines @@
 class _PrefixExpectation {
   final ReferenceKind kind;
   final String name;
   final String absoluteUri;
   final String relativeUri;
   final int numTypeParameters;
 
   _PrefixExpectation(this.kind, this.name,
       {this.absoluteUri, this.relativeUri, this.numTypeParameters: 0});
 }