fasta.CommentToken implement analyzer.CommentToken

pkg/front_end/test/token_test.dart

 // Copyright (c) 2017, 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.
 
 import 'package:front_end/src/fasta/scanner/string_scanner.dart';
 import 'package:front_end/src/fasta/scanner/token.dart' as fasta;
 import 'package:front_end/src/scanner/token.dart';
 import 'package:front_end/src/scanner/reader.dart' as analyzer;
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
@@ skipping 41 matching lines @@
         Token comment = token.precedingComments;
         token = token.next;
         if (comment != null) return comment;
       }
       return null;
     }
 
     fasta.Token comment = nextComment();
     expect(comment.lexeme, contains('Single line dartdoc comment'));
     expect(comment.type, TokenType.SINGLE_LINE_COMMENT);
+    expect(comment, new isInstanceOf<DocumentationCommentToken>());
 
     comment = nextComment();
     expect(comment.lexeme, contains('Multi-line dartdoc comment'));
     expect(comment.type, TokenType.MULTI_LINE_COMMENT);
+    expect(comment, new isInstanceOf<DocumentationCommentToken>());
 
     comment = nextComment();
     expect(comment.lexeme, contains('Single line comment'));
     expect(comment.type, TokenType.SINGLE_LINE_COMMENT);
+    expect(comment, new isInstanceOf<CommentToken>());
 
     comment = nextComment();
     expect(comment.lexeme, contains('Multi-line comment'));
     expect(comment.type, TokenType.MULTI_LINE_COMMENT);
+    expect(comment, new isInstanceOf<CommentToken>());
   }
 
   void test_copy() {
     String source = '/* 1 */ /* 2 */ main() {print("hello"); return;}';
     int commentCount = 0;
 
     void assertCopiedToken(Token token1, Token token2) {
       if (token1 == null) {
         expect(token2, isNull);
         return;
@@ skipping 76 matching lines @@
     token = token.next;
     expect(token.lexeme, '&');
     expect(token.value(), '&');
     // String tokens
     token = token.next;
     print('String token :: ${token.runtimeType}');
     expect(token.lexeme, '"home"');
     expect(token.value(), '"home"');
   }
 }