code: ///////////////////////////////////////////////////////////////////////////////////////////////
  // checkstyle: Checks Java source code and other text files for adherence to a set of rules.
  // Copyright (C) 2001-2023 the original author or authors.
  //
  // This library is free software; you can redistribute it and/or
  // modify it under the terms of the GNU Lesser General Public
  // License as published by the Free Software Foundation; either
  // version 2.1 of the License, or (at your option) any later version.
  //
  // This library is distributed in the hope that it will be useful,
  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  // Lesser General Public License for more details.
  //
  // You should have received a copy of the GNU Lesser General Public
  // License along with this library; if not, write to the Free Software
  // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  ///////////////////////////////////////////////////////////////////////////////////////////////
  
  package com.puppycrawl.tools.checkstyle.grammar.comments;
  
  import static com.google.common.truth.Truth.assertWithMessage;
  
  import java.nio.charset.StandardCharsets;
  import java.util.Arrays;
  import java.util.LinkedHashSet;
  import java.util.Set;
  
  import org.junit.jupiter.api.Test;
  
  import com.puppycrawl.tools.checkstyle.AbstractModuleTestSupport;
  import com.puppycrawl.tools.checkstyle.DefaultConfiguration;
  import com.puppycrawl.tools.checkstyle.api.AbstractCheck;
  import com.puppycrawl.tools.checkstyle.api.DetailAST;
  import com.puppycrawl.tools.checkstyle.api.TokenTypes;
  import com.puppycrawl.tools.checkstyle.internal.utils.CheckUtil;
  import com.puppycrawl.tools.checkstyle.utils.CommonUtil;
  
  public class AllBlockCommentsTest extends AbstractModuleTestSupport {
  
      private static final Set<String> ALL_COMMENTS = new LinkedHashSet<>();
  
      private static String lineSeparator;
  
      @Override
      protected String getPackageLocation() {
          return "com/puppycrawl/tools/checkstyle/grammar/comments";
      }
  
      @Test
      public void testAllBlockComments() throws Exception {
          final DefaultConfiguration checkConfig =
                  createModuleConfig(BlockCommentListenerCheck.class);
          final String path = getPath("InputFullOfBlockComments.java");
          lineSeparator = CheckUtil.getLineSeparatorForFile(path, StandardCharsets.UTF_8);
          final String[] expected = CommonUtil.EMPTY_STRING_ARRAY;
          verify(checkConfig, path, expected);
          assertWithMessage("All comments should be empty")
              .that(ALL_COMMENTS)
              .isEmpty();
      }
  
      public static class BlockCommentListenerCheck extends AbstractCheck {
  
          @Override
          public boolean isCommentNodesRequired() {
              return true;
          }
  
          @Override
          public int[] getDefaultTokens() {
              return getAcceptableTokens();
          }
  
          @Override
          public int[] getAcceptableTokens() {
              return new int[] {TokenTypes.BLOCK_COMMENT_BEGIN};
          }
  
          @Override
          public int[] getRequiredTokens() {
              return getAcceptableTokens();
          }
  
          @Override
          public void init() {
              ALL_COMMENTS.addAll(Arrays.asList("0", "1", "2", "3", "4", "5",
                      "6", "7", "8", "9", "10", "11", "12", "13", "14", "15",
                      "16", "17", "18", "19", "20",
                      lineSeparator + "21" + lineSeparator,
                      "22", "23", "24", "25", "26", "27", "28", "29", "30", "31", "32",
                      "33", "34", "35", "36", "37", "38", "  39  ", "40", "41",
                      "42", "43", "44", "45", "46", "47", "48", "49", "50",
                      "51", "52", "53", "54", "55", "56", "57", "58", "59",
                      "60", "61"));
          }
  
          @Override
          public void visitToken(DetailAST ast) {
              final String commentContent = ast.getFirstChild().getText();
              assertWithMessage("Unexpected comment: %s", commentContent)
                      .that(ALL_COMMENTS.remove(commentContent))
                      .isTrue();
          }
  
      }
  
  }
  