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.coding;
  
  import static com.google.common.truth.Truth.assertWithMessage;
  import static com.puppycrawl.tools.checkstyle.checks.coding.EqualsHashCodeCheck.MSG_KEY_EQUALS;
  import static com.puppycrawl.tools.checkstyle.checks.coding.EqualsHashCodeCheck.MSG_KEY_HASHCODE;
  
  import java.io.File;
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.List;
  
  import org.junit.jupiter.api.Test;
  
  import com.google.common.collect.ImmutableMap;
  import com.puppycrawl.tools.checkstyle.AbstractModuleTestSupport;
  import com.puppycrawl.tools.checkstyle.DefaultConfiguration;
  import com.puppycrawl.tools.checkstyle.utils.CommonUtil;
  
  public class EqualsHashCodeCheckTest
      extends AbstractModuleTestSupport {
  
      @Override
      protected String getPackageLocation() {
          return "com/puppycrawl/tools/checkstyle/checks/coding/equalshashcode";
      }
  
      @Test
      public void testSemantic() throws Exception {
          final String[] expected = {
              "96:13: " + getCheckMessage(MSG_KEY_HASHCODE),
          };
          verifyWithInlineConfigParser(
                  getPath("InputEqualsHashCodeSemantic.java"), expected);
      }
  
      @Test
      public void testNoEquals() throws Exception {
          final String[] expected = {
              "10:5: " + getCheckMessage(MSG_KEY_EQUALS),
          };
          verifyWithInlineConfigParser(
                  getPath("InputEqualsHashCodeNoEquals.java"), expected);
      }
  
      @Test
      public void testBooleanMethods() throws Exception {
          final String[] expected = CommonUtil.EMPTY_STRING_ARRAY;
          verifyWithInlineConfigParser(
                  getPath("InputEqualsHashCode.java"), expected);
      }
  
      @Test
      public void testMultipleInputs() throws Exception {
          final DefaultConfiguration checkConfig =
              createModuleConfig(EqualsHashCodeCheck.class);
  
          final List<String> expectedFirstInputErrors = Collections.singletonList(
              "10:5: " + getCheckMessage(MSG_KEY_EQUALS)
          );
          final List<String> expectedSecondInputErrors = Collections.singletonList(
              "96:13: " + getCheckMessage(MSG_KEY_HASHCODE)
          );
          final List<String> expectedThirdInputErrors =
              Arrays.asList(CommonUtil.EMPTY_STRING_ARRAY);
  
          final String firstInput = getPath("InputEqualsHashCodeNoEquals.java");
          final String secondInput = getPath("InputEqualsHashCodeSemantic.java");
          final String thirdInput = getPath("InputEqualsHashCode.java");
  
          final File[] inputs = {
              new File(firstInput),
              new File(secondInput),
              new File(thirdInput),
          };
  
          verify(createChecker(checkConfig), inputs, ImmutableMap.of(
              firstInput, expectedFirstInputErrors,
              secondInput, expectedSecondInputErrors,
              thirdInput, expectedThirdInputErrors
          ));
      }
  
      @Test
      public void testEqualsParameter() throws Exception {
          final String[] expected = {
              "16:9: " + getCheckMessage(MSG_KEY_EQUALS),
              "24:9: " + getCheckMessage(MSG_KEY_HASHCODE),
              "54:9: " + getCheckMessage(MSG_KEY_HASHCODE),
              "59:9: " + getCheckMessage(MSG_KEY_EQUALS),
              "71:9: " + getCheckMessage(MSG_KEY_EQUALS),
              "74:9: " + getCheckMessage(MSG_KEY_HASHCODE),
              "81:9: " + getCheckMessage(MSG_KEY_EQUALS),
              "88:9: " + getCheckMessage(MSG_KEY_HASHCODE),
              "103:9: " + getCheckMessage(MSG_KEY_EQUALS),
          };
          verifyWithInlineConfigParser(
                  getPath("InputEqualsHashCodeEqualsParameter.java"), expected);
      }
  
      @Test
      public void testTokensNotNull() {
          final EqualsHashCodeCheck check = new EqualsHashCodeCheck();
          assertWithMessage("Acceptable tokens should not be null")
              .that(check.getAcceptableTokens())
              .isNotNull();
          assertWithMessage("Default tokens should not be null")
              .that(check.getDefaultTokens())
              .isNotNull();
          assertWithMessage("Required tokens should not be null")
              .that(check.getRequiredTokens())
              .isNotNull();
      }
  
  }
  