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.naming;
  
  import static com.google.common.truth.Truth.assertWithMessage;
  import static com.puppycrawl.tools.checkstyle.checks.naming.AbstractNameCheck.MSG_INVALID_PATTERN;
  
  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 CatchParameterNameCheckTest extends AbstractModuleTestSupport {
  
      @Override
      protected String getPackageLocation() {
          return "com/puppycrawl/tools/checkstyle/checks/naming/catchparametername";
      }
  
      @Test
      public void testTokens() {
          final CatchParameterNameCheck catchParameterNameCheck = new CatchParameterNameCheck();
          final int[] expected = {TokenTypes.PARAMETER_DEF};
  
          assertWithMessage("Default required tokens are invalid")
              .that(catchParameterNameCheck.getRequiredTokens())
              .isEqualTo(expected);
          assertWithMessage("Default acceptable tokens are invalid")
              .that(catchParameterNameCheck.getAcceptableTokens())
              .isEqualTo(expected);
      }
  
      @Test
      public void testDefaultConfigurationOnCorrectFile() throws Exception {
          final String[] expected = CommonUtil.EMPTY_STRING_ARRAY;
  
          verifyWithInlineConfigParser(
                  getPath("InputCatchParameterNameSimple.java"), expected);
      }
  
      @Test
      public void testDefaultConfigurationOnFileWithViolations() throws Exception {
          final String defaultFormat = "^(e|t|ex|[a-z][a-z][a-zA-Z]+)$";
  
          final String[] expected = {
              "25:28: " + getCheckMessage(MSG_INVALID_PATTERN, "exception1", defaultFormat),
              "35:39: " + getCheckMessage(MSG_INVALID_PATTERN, "ie", defaultFormat),
              "38:28: " + getCheckMessage(MSG_INVALID_PATTERN, "iException", defaultFormat),
              "41:28: " + getCheckMessage(MSG_INVALID_PATTERN, "ok", defaultFormat),
              "45:28: " + getCheckMessage(MSG_INVALID_PATTERN, "e1", defaultFormat),
              "47:32: " + getCheckMessage(MSG_INVALID_PATTERN, "e2", defaultFormat),
              "51:28: " + getCheckMessage(MSG_INVALID_PATTERN, "t1", defaultFormat),
              "53:32: " + getCheckMessage(MSG_INVALID_PATTERN, "t2", defaultFormat),
          };
  
          verifyWithInlineConfigParser(
                  getPath("InputCatchParameterName.java"), expected);
      }
  
      @Test
      public void testCustomFormatFromJavadoc() throws Exception {
  
          final String[] expected = {
              "13:28: " + getCheckMessage(MSG_INVALID_PATTERN, "e", "^[a-z][a-zA-Z0-9]+$"),
              "31:28: " + getCheckMessage(MSG_INVALID_PATTERN, "t", "^[a-z][a-zA-Z0-9]+$"),
          };
  
          verifyWithInlineConfigParser(
                  getPath("InputCatchParameterName2.java"), expected);
      }
  
      @Test
      public void testCustomFormatWithNoAnchors() throws Exception {
  
          final String[] expected = CommonUtil.EMPTY_STRING_ARRAY;
  
          verifyWithInlineConfigParser(
                  getPath("InputCatchParameterName3.java"), expected);
      }
  
  }
  