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.checks;
  
  import static com.google.common.truth.Truth.assertWithMessage;
  import static com.puppycrawl.tools.checkstyle.checks.TrailingCommentCheck.MSG_KEY;
  
  import org.junit.jupiter.api.Test;
  
  import com.puppycrawl.tools.checkstyle.AbstractModuleTestSupport;
  import com.puppycrawl.tools.checkstyle.api.TokenTypes;
  import com.puppycrawl.tools.checkstyle.utils.CommonUtil;
  
  public class TrailingCommentCheckTest extends AbstractModuleTestSupport {
  
      @Override
      protected String getPackageLocation() {
          return "com/puppycrawl/tools/checkstyle/checks/trailingcomment";
      }
  
      @Test
      public void testGetRequiredTokens() {
          final TrailingCommentCheck checkObj = new TrailingCommentCheck();
          final int[] expected = {TokenTypes.SINGLE_LINE_COMMENT,
              TokenTypes.BLOCK_COMMENT_BEGIN, };
          assertWithMessage("Required tokens array is not empty")
                  .that(checkObj.getRequiredTokens())
                  .isEqualTo(expected);
      }
  
      @Test
      public void testGetAcceptableTokens() {
          final TrailingCommentCheck checkObj = new TrailingCommentCheck();
          final int[] expected = {TokenTypes.SINGLE_LINE_COMMENT,
              TokenTypes.BLOCK_COMMENT_BEGIN, };
          assertWithMessage("Acceptable tokens array is not empty")
                  .that(checkObj.getAcceptableTokens())
                  .isEqualTo(expected);
      }
  
      @Test
      public void testDefaults() throws Exception {
          final String[] expected = {
              "13:12: " + getCheckMessage(MSG_KEY),
              "17:12: " + getCheckMessage(MSG_KEY),
              "19:22: " + getCheckMessage(MSG_KEY),
              "30:19: " + getCheckMessage(MSG_KEY),
              "31:21: " + getCheckMessage(MSG_KEY),
              "42:50: " + getCheckMessage(MSG_KEY),
              "44:51: " + getCheckMessage(MSG_KEY),
              "46:31: " + getCheckMessage(MSG_KEY),
          };
          verifyWithInlineConfigParser(
                  getPath("InputTrailingComment.java"), expected);
      }
  
      @Test
      public void testLegalComment() throws Exception {
          final String[] expected = {
              "13:12: " + getCheckMessage(MSG_KEY),
              "17:12: " + getCheckMessage(MSG_KEY),
              "19:22: " + getCheckMessage(MSG_KEY),
              "30:19: " + getCheckMessage(MSG_KEY),
              "32:21: " + getCheckMessage(MSG_KEY),
              "42:50: " + getCheckMessage(MSG_KEY),
              "45:31: " + getCheckMessage(MSG_KEY),
          };
          verifyWithInlineConfigParser(
                  getPath("InputTrailingComment2.java"), expected);
      }
  
      @Test
      public void testFormat() throws Exception {
          final String[] expected = {
              "1:1: " + getCheckMessage(MSG_KEY),
              "12:12: " + getCheckMessage(MSG_KEY),
              "13:5: " + getCheckMessage(MSG_KEY),
              "14:33: " + getCheckMessage(MSG_KEY),
              "15:39: " + getCheckMessage(MSG_KEY),
              "16:22: " + getCheckMessage(MSG_KEY),
              "21:44: " + getCheckMessage(MSG_KEY),
              "22:7: " + getCheckMessage(MSG_KEY),
              "23:5: " + getCheckMessage(MSG_KEY),
              "26:19: " + getCheckMessage(MSG_KEY),
              "27:36: " + getCheckMessage(MSG_KEY),
              "34:5: " + getCheckMessage(MSG_KEY),
              "37:50: " + getCheckMessage(MSG_KEY),
              "38:62: " + getCheckMessage(MSG_KEY),
              "39:31: " + getCheckMessage(MSG_KEY),
              "42:39: " + getCheckMessage(MSG_KEY),
              "43:9: " + getCheckMessage(MSG_KEY),
              "51:5: " + getCheckMessage(MSG_KEY),
          };
          verifyWithInlineConfigParser(
                  getPath("InputTrailingComment3.java"), expected);
      }
  
      @Test
      public void testLegalCommentWithNoPrecedingWhitespace() throws Exception {
          final String[] expected = CommonUtil.EMPTY_STRING_ARRAY;
  
          verifyWithInlineConfigParser(
                  getPath("InputTrailingCommentWithNoPrecedingWhitespace.java"), expected);
      }
  
      @Test
      public void testWithEmoji() throws Exception {
          final String[] expected = {
              "13:24: " + getCheckMessage(MSG_KEY),
              "15:27: " + getCheckMessage(MSG_KEY),
              "21:33: " + getCheckMessage(MSG_KEY),
              "25:13: " + getCheckMessage(MSG_KEY),
              "27:16: " + getCheckMessage(MSG_KEY),
              "28:24: " + getCheckMessage(MSG_KEY),
              "33:37: " + getCheckMessage(MSG_KEY),
          };
          verifyWithInlineConfigParser(
              getPath("InputTrailingCommentWithEmoji.java"), expected);
      }
  }
  