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.metrics;
  
  import static com.google.common.truth.Truth.assertWithMessage;
  import static com.puppycrawl.tools.checkstyle.checks.metrics.ClassDataAbstractionCouplingCheck.MSG_KEY;
  
  import org.antlr.v4.runtime.CommonToken;
  import org.junit.jupiter.api.Test;
  
  import com.puppycrawl.tools.checkstyle.AbstractModuleTestSupport;
  import com.puppycrawl.tools.checkstyle.DefaultConfiguration;
  import com.puppycrawl.tools.checkstyle.DetailAstImpl;
  import com.puppycrawl.tools.checkstyle.api.CheckstyleException;
  import com.puppycrawl.tools.checkstyle.api.TokenTypes;
  import com.puppycrawl.tools.checkstyle.utils.CommonUtil;
  
  public class ClassDataAbstractionCouplingCheckTest extends AbstractModuleTestSupport {
  
      @Override
      protected String getPackageLocation() {
          return "com/puppycrawl/tools/checkstyle/checks/metrics/classdataabstractioncoupling";
      }
  
      @Test
      public void testTokens() {
          final ClassDataAbstractionCouplingCheck check = new ClassDataAbstractionCouplingCheck();
          assertWithMessage("Required tokens should not be null")
              .that(check.getRequiredTokens())
              .isNotNull();
          assertWithMessage("Acceptable tokens should not be null")
              .that(check.getAcceptableTokens())
              .isNotNull();
          assertWithMessage("Invalid default tokens")
              .that(check.getAcceptableTokens())
              .isEqualTo(check.getDefaultTokens());
          assertWithMessage("Invalid acceptable tokens")
              .that(check.getRequiredTokens())
              .isEqualTo(check.getDefaultTokens());
      }
  
      @Test
      public void test() throws Exception {
  
          final String[] expected = {
              "16:1: " + getCheckMessage(MSG_KEY, 4, 0, "[AnotherInnerClass, HashMap, HashSet, int]"),
              "17:5: " + getCheckMessage(MSG_KEY, 1, 0, "[ArrayList]"),
              "37:1: " + getCheckMessage(MSG_KEY, 2, 0, "[HashMap, HashSet]"),
          };
  
          verifyWithInlineConfigParser(
                  getPath("InputClassDataAbstractionCoupling.java"), expected);
      }
  
      @Test
      public void testExcludedPackageDirectPackages() throws Exception {
          final String[] expected = {
              "30:1: " + getCheckMessage(MSG_KEY, 2, 0, "[AAClass, ABClass]"),
          };
  
          verifyWithInlineConfigParser(
                  getPath("InputClassDataAbstractionCouplingExcludedPackagesDirectPackages.java"),
                  expected);
      }
  
      @Test
      public void testExcludedPackageCommonPackages() throws Exception {
          final String[] expected = {
              "28:1: " + getCheckMessage(MSG_KEY, 2, 0, "[AAClass, ABClass]"),
              "32:5: " + getCheckMessage(MSG_KEY, 2, 0, "[BClass, CClass]"),
              "38:1: " + getCheckMessage(MSG_KEY, 1, 0, "[CClass]"),
          };
          verifyWithInlineConfigParser(
                  getPath("InputClassDataAbstractionCouplingExcludedPackagesCommonPackage.java"),
                  expected);
      }
  
      @Test
      public void testExcludedPackageWithEndingDot() throws Exception {
          final DefaultConfiguration checkConfig =
              createModuleConfig(ClassDataAbstractionCouplingCheck.class);
  
          checkConfig.addProperty("max", "0");
          checkConfig.addProperty("excludedPackages",
              "com.puppycrawl.tools.checkstyle.checks.metrics.inputs.a.");
  
          try {
              createChecker(checkConfig);
              assertWithMessage("exception expected").fail();
          }
          catch (CheckstyleException ex) {
              assertWithMessage("Invalid exception message")
                  .that(ex.getMessage())
                  .isEqualTo("cannot initialize module com.puppycrawl.tools.checkstyle.TreeWalker - "
                      + "cannot initialize module com.puppycrawl.tools.checkstyle.checks."
                      + "metrics.ClassDataAbstractionCouplingCheck - "
                      + "Cannot set property 'excludedPackages' to "
                      + "'com.puppycrawl.tools.checkstyle.checks.metrics.inputs.a.'");
              assertWithMessage("Invalid exception message,")
                  .that(ex.getCause().getCause().getCause().getCause().getMessage())
                  .isEqualTo("the following values are not valid identifiers: ["
                      + "com.puppycrawl.tools.checkstyle.checks.metrics.inputs.a.]");
          }
      }
  
      @Test
      public void testExcludedPackageCommonPackagesAllIgnored() throws Exception {
          final String[] expected = CommonUtil.EMPTY_STRING_ARRAY;
          verifyWithInlineConfigParser(
                  getPath("InputClassDataAbstractionCouplingExcludedPackagesAllIgnored.java"),
                  expected);
      }
  
      @Test
      public void testDefaultConfiguration() throws Exception {
          final String[] expected = CommonUtil.EMPTY_STRING_ARRAY;
          verifyWithInlineConfigParser(
                  getPath("InputClassDataAbstractionCoupling2.java"), expected);
      }
  
      @Test
      public void testWrongToken() {
          final ClassDataAbstractionCouplingCheck classDataAbstractionCouplingCheckObj =
              new ClassDataAbstractionCouplingCheck();
          final DetailAstImpl ast = new DetailAstImpl();
          ast.initialize(new CommonToken(TokenTypes.CTOR_DEF, "ctor"));
          try {
              classDataAbstractionCouplingCheckObj.visitToken(ast);
              assertWithMessage("exception expected").fail();
          }
          catch (IllegalArgumentException ex) {
              assertWithMessage("Invalid exception message")
                  .that(ex.getMessage())
                  .isEqualTo("Unknown type: ctor[0x-1]");
          }
      }
  
      @Test
      public void testRegularExpression() throws Exception {
  
          final String[] expected = {
              "22:1: " + getCheckMessage(MSG_KEY, 2, 0, "[AnotherInnerClass, int]"),
              "23:5: " + getCheckMessage(MSG_KEY, 1, 0, "[ArrayList]"),
          };
  
          verifyWithInlineConfigParser(
                  getPath("InputClassDataAbstractionCoupling3.java"), expected);
      }
  
      @Test
      public void testEmptyRegularExpression() throws Exception {
  
          final String[] expected = {
              "22:1: " + getCheckMessage(MSG_KEY, 4, 0, "[AnotherInnerClass, HashMap, HashSet, int]"),
              "23:5: " + getCheckMessage(MSG_KEY, 1, 0, "[ArrayList]"),
              "43:1: " + getCheckMessage(MSG_KEY, 2, 0, "[HashMap, HashSet]"),
          };
  
          verifyWithInlineConfigParser(
                  getPath("InputClassDataAbstractionCoupling4.java"), expected);
      }
  
      @Test
      public void testClassDataAbstractionCouplingRecords() throws Exception {
  
          final int maxAbstraction = 1;
          final String[] expected = {
              "31:1: " + getCheckMessage(MSG_KEY, 2, maxAbstraction, "[Date, Time]"),
              "36:1: " + getCheckMessage(MSG_KEY, 2, maxAbstraction, "[Date, Time]"),
              "46:1: " + getCheckMessage(MSG_KEY, 2, maxAbstraction, "[Date, Time]"),
              "55:1: " + getCheckMessage(MSG_KEY, 2, maxAbstraction, "[Date, Time]"),
              "67:5: " + getCheckMessage(MSG_KEY, 3, maxAbstraction, "[Date, Place, Time]"),
          };
  
          verifyWithInlineConfigParser(
                  getNonCompilablePath("InputClassDataAbstractionCouplingRecords.java"),
              expected);
      }
  
      @Test
      public void testNew() throws Exception {
  
          final String[] expected = CommonUtil.EMPTY_STRING_ARRAY;
  
          verifyWithInlineConfigParser(
                  getPath("InputClassDataAbstractionCoupling5.java"), expected);
      }
  
  }
  