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 org.checkstyle.suppressionxpathfilter;
  
  import java.io.File;
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.List;
  
  import org.junit.jupiter.api.Test;
  
  import com.puppycrawl.tools.checkstyle.DefaultConfiguration;
  import com.puppycrawl.tools.checkstyle.checks.blocks.AvoidNestedBlocksCheck;
  
  public class XpathRegressionAvoidNestedBlocksTest extends AbstractXpathTestSupport {
  
      @Override
      protected String getCheckName() {
          return AvoidNestedBlocksCheck.class.getSimpleName();
      }
  
      @Test
      public void testEmpty() throws Exception {
          final File fileToProcess = new File(
                  getPath("SuppressionXpathRegressionAvoidNestedBlocksEmpty.java"));
  
          final DefaultConfiguration moduleConfig =
                  createModuleConfig(AvoidNestedBlocksCheck.class);
  
          final String[] expectedViolation = {
              "6:9: " + getCheckMessage(AvoidNestedBlocksCheck.class,
                      AvoidNestedBlocksCheck.MSG_KEY_BLOCK_NESTED),
          };
  
          final List<String> expectedXpathQueries = Collections.singletonList(
                  "/COMPILATION_UNIT/CLASS_DEF"
                          + "[./IDENT[@text='SuppressionXpathRegressionAvoidNestedBlocksEmpty']]"
                          + "/OBJBLOCK/METHOD_DEF[./IDENT[@text='empty']]/SLIST/SLIST"
          );
  
          runVerifications(moduleConfig, fileToProcess, expectedViolation,
                  expectedXpathQueries);
      }
  
      @Test
      public void testVariableAssignment() throws Exception {
          final File fileToProcess = new File(
                  getPath("SuppressionXpathRegressionAvoidNestedBlocksVariable.java"));
  
          final DefaultConfiguration moduleConfig =
                  createModuleConfig(AvoidNestedBlocksCheck.class);
  
          final String[] expectedViolation = {
              "7:9: " + getCheckMessage(AvoidNestedBlocksCheck.class,
                      AvoidNestedBlocksCheck.MSG_KEY_BLOCK_NESTED),
          };
  
          final List<String> expectedXpathQueries = Collections.singletonList(
                  "/COMPILATION_UNIT/CLASS_DEF"
                          + "[./IDENT[@text='SuppressionXpathRegressionAvoidNestedBlocksVariable']]"
                          + "/OBJBLOCK/METHOD_DEF[./IDENT[@text='varAssign']]/SLIST/SLIST"
          );
  
          runVerifications(moduleConfig, fileToProcess, expectedViolation,
                  expectedXpathQueries);
      }
  
      @Test
      public void testSwitchAllowInSwitchCaseFalse() throws Exception {
          final File fileToProcess = new File(
                  getPath("SuppressionXpathRegressionAvoidNestedBlocksSwitch1.java"));
  
          final DefaultConfiguration moduleConfig =
                  createModuleConfig(AvoidNestedBlocksCheck.class);
  
          final String[] expectedViolation = {
              "9:21: " + getCheckMessage(AvoidNestedBlocksCheck.class,
                      AvoidNestedBlocksCheck.MSG_KEY_BLOCK_NESTED),
              "16:13: " + getCheckMessage(AvoidNestedBlocksCheck.class,
                      AvoidNestedBlocksCheck.MSG_KEY_BLOCK_NESTED),
              "20:21: " + getCheckMessage(AvoidNestedBlocksCheck.class,
                      AvoidNestedBlocksCheck.MSG_KEY_BLOCK_NESTED),
          };
  
          final List<String> expectedXpathQueries = Arrays.asList(
                  "/COMPILATION_UNIT/CLASS_DEF"
                          + "[./IDENT[@text='SuppressionXpathRegressionAvoidNestedBlocksSwitch1']]"
                          + "/OBJBLOCK/METHOD_DEF[./IDENT[@text='s']]/SLIST/LITERAL_SWITCH"
                          + "/CASE_GROUP/SLIST",
                  "/COMPILATION_UNIT/CLASS_DEF"
                          + "[./IDENT[@text='SuppressionXpathRegressionAvoidNestedBlocksSwitch1']]"
                          + "/OBJBLOCK/METHOD_DEF[./IDENT[@text='s']]/SLIST/LITERAL_SWITCH"
                          + "/CASE_GROUP/SLIST/SLIST"
          );
  
          runVerifications(moduleConfig, fileToProcess, expectedViolation,
                  expectedXpathQueries);
      }
  
      @Test
      public void testSwitchAllowInSwitchCaseTrue() throws Exception {
          final File fileToProcess = new File(
                  getPath("SuppressionXpathRegressionAvoidNestedBlocksSwitch2.java"));
  
          final DefaultConfiguration moduleConfig =
                  createModuleConfig(AvoidNestedBlocksCheck.class);
          moduleConfig.addProperty("allowInSwitchCase", "true");
  
          final String[] expectedViolation = {
              "9:21: " + getCheckMessage(AvoidNestedBlocksCheck.class,
                      AvoidNestedBlocksCheck.MSG_KEY_BLOCK_NESTED),
              "16:13: " + getCheckMessage(AvoidNestedBlocksCheck.class,
                      AvoidNestedBlocksCheck.MSG_KEY_BLOCK_NESTED),
          };
  
          final List<String> expectedXpathQueries = Arrays.asList(
                  "/COMPILATION_UNIT/CLASS_DEF"
                          + "[./IDENT[@text='SuppressionXpathRegressionAvoidNestedBlocksSwitch2']]"
                          + "/OBJBLOCK/METHOD_DEF[./IDENT[@text='s']]/SLIST/LITERAL_SWITCH"
                          + "/CASE_GROUP/SLIST",
                  "/COMPILATION_UNIT/CLASS_DEF"
                          + "[./IDENT[@text='SuppressionXpathRegressionAvoidNestedBlocksSwitch2']]"
                          + "/OBJBLOCK/METHOD_DEF[./IDENT[@text='s']]/SLIST/LITERAL_SWITCH"
                          + "/CASE_GROUP/SLIST/SLIST"
          );
  
          runVerifications(moduleConfig, fileToProcess, expectedViolation,
                  expectedXpathQueries);
      }
  
  }
  