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.google.checkstyle.test.chapter5naming.rule527localvariablenames;
  
  import java.util.Map;
  
  import org.junit.jupiter.api.Test;
  
  import com.google.checkstyle.test.base.AbstractGoogleModuleTestSupport;
  import com.puppycrawl.tools.checkstyle.api.Configuration;
  
  public class PatternVariableNameTest extends AbstractGoogleModuleTestSupport {
  
      private static final String MSG_KEY = "name.invalidPattern";
  
      @Override
      protected String getPackageLocation() {
          return "com/google/checkstyle/test/chapter5naming/rule527localvariablenames";
      }
  
      @Test
      public void testPatternVariableName() throws Exception {
          final Configuration checkConfig = getModuleConfig("PatternVariableName");
          final String format = checkConfig.getProperty("format");
          final Map<String, String> messages = checkConfig.getMessages();
          final String[] expected = {
              "11:39: " + getCheckMessage(messages, MSG_KEY, "OTHER", format),
              "21:34: " + getCheckMessage(messages, MSG_KEY, "Count", format),
              "36:36: " + getCheckMessage(messages, MSG_KEY, "aA", format),
              "37:42: " + getCheckMessage(messages, MSG_KEY, "a1_a", format),
              "40:34: " + getCheckMessage(messages, MSG_KEY, "A_A", format),
              "41:43: " + getCheckMessage(messages, MSG_KEY, "aa2_a", format),
              "53:37: " + getCheckMessage(messages, MSG_KEY, "_a", format),
              "59:43: " + getCheckMessage(messages, MSG_KEY, "_aa", format),
              "63:41: " + getCheckMessage(messages, MSG_KEY, "aa_", format),
              "68:38: " + getCheckMessage(messages, MSG_KEY, "aaa$aaa", format),
              "69:36: " + getCheckMessage(messages, MSG_KEY, "$aaaaaa", format),
              "70:37: " + getCheckMessage(messages, MSG_KEY, "aaaaaa$", format),
              "77:41: " + getCheckMessage(messages, MSG_KEY, "_A_aa_B", format),
  
          };
  
          final String filePath =
                  getNonCompilablePath(
                          "InputPatternVariableNameEnhancedInstanceofTestDefault.java");
  
          final Integer[] warnList = getLinesWithWarn(filePath);
          verify(checkConfig, filePath, expected, warnList);
      }
  
  }
  