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.OneStatementPerLineCheck.MSG_KEY;
  
  import java.io.File;
  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 OneStatementPerLineCheckTest extends AbstractModuleTestSupport {
  
      @Override
      protected String getPackageLocation() {
          return "com/puppycrawl/tools/checkstyle/checks/coding/onestatementperline";
      }
  
      @Test
      public void testMultiCaseClass() throws Exception {
          final String[] expected = {
              "13:59: " + getCheckMessage(MSG_KEY),
              "93:21: " + getCheckMessage(MSG_KEY),
              "120:14: " + getCheckMessage(MSG_KEY),
              "146:15: " + getCheckMessage(MSG_KEY),
              "158:23: " + getCheckMessage(MSG_KEY),
              "178:19: " + getCheckMessage(MSG_KEY),
              "181:59: " + getCheckMessage(MSG_KEY),
          };
  
          verifyWithInlineConfigParser(
                  getPath("InputOneStatementPerLineSingleLine.java"),
              expected);
      }
  
      @Test
      public void testTokensNotNull() {
          final OneStatementPerLineCheck check = new OneStatementPerLineCheck();
          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();
      }
  
      @Test
      public void testWithMultilineStatements() throws Exception {
          final String[] expected = {
              "49:21: " + getCheckMessage(MSG_KEY),
              "66:17: " + getCheckMessage(MSG_KEY),
              "74:17: " + getCheckMessage(MSG_KEY),
              "86:10: " + getCheckMessage(MSG_KEY),
              "95:28: " + getCheckMessage(MSG_KEY),
              "140:39: " + getCheckMessage(MSG_KEY),
              "173:46: " + getCheckMessage(MSG_KEY),
              "184:47: " + getCheckMessage(MSG_KEY),
          };
  
          verifyWithInlineConfigParser(
                  getPath("InputOneStatementPerLineMultiline.java"),
              expected);
      }
  
      @Test
      public void oneStatementNonCompilableInputTest() throws Exception {
          final String[] expected = {
              "39:4: " + getCheckMessage(MSG_KEY),
              "44:54: " + getCheckMessage(MSG_KEY),
              "45:54: " + getCheckMessage(MSG_KEY),
              "45:70: " + getCheckMessage(MSG_KEY),
              "46:46: " + getCheckMessage(MSG_KEY),
              "50:81: " + getCheckMessage(MSG_KEY),
          };
  
          verifyWithInlineConfigParser(
                  getNonCompilablePath("InputOneStatementPerLine.java"), expected);
      }
  
      @Test
      public void testResourceReferenceVariableIgnored() throws Exception {
          final String[] expected = {
              "32:42: " + getCheckMessage(MSG_KEY),
              "36:43: " + getCheckMessage(MSG_KEY),
              "42:46: " + getCheckMessage(MSG_KEY),
              "46:46: " + getCheckMessage(MSG_KEY),
          };
  
          verifyWithInlineConfigParser(
                  getPath("InputOneStatementPerLineTryWithResources.java"),
                  expected);
      }
  
      @Test
      public void testResourcesIgnored() throws Exception {
          final String[] expected = CommonUtil.EMPTY_STRING_ARRAY;
          verifyWithInlineConfigParser(
                  getPath("InputOneStatementPerLineTryWithResourcesIgnore.java"),
                  expected);
      }
  
      @Test
      public void testAllTheCodeInSingleLine() throws Exception {
          final DefaultConfiguration checkConfig =
                  createModuleConfig(OneStatementPerLineCheck.class);
  
          final String[] expected = {
              "1:102: " + getCheckMessage(MSG_KEY),
              "1:131: " + getCheckMessage(MSG_KEY),
              "1:165: " + getCheckMessage(MSG_KEY),
              "1:231: " + getCheckMessage(MSG_KEY),
              "1:406: " + getCheckMessage(MSG_KEY),
              "1:443: " + getCheckMessage(MSG_KEY),
              "1:455: " + getCheckMessage(MSG_KEY),
          };
  
          verify(checkConfig, getPath("InputOneStatementPerLine.java"),
                  expected);
      }
  
      @Test
      public void testStateIsClearedOnBeginTreeForLastStatementEnd() throws Exception {
          final DefaultConfiguration checkConfig = createModuleConfig(OneStatementPerLineCheck.class);
          final String inputWithWarnings = getPath("InputOneStatementPerLineBeginTree1.java");
          final String inputWithoutWarnings = getPath("InputOneStatementPerLineBeginTree2.java");
          final List<String> expectedFirstInput = List.of(
                  "1:96: " + getCheckMessage(MSG_KEY)
          );
          final List<String> expectedSecondInput = List.of(CommonUtil.EMPTY_STRING_ARRAY);
          final File[] inputs = {new File(inputWithWarnings), new File(inputWithoutWarnings)};
  
          verify(createChecker(checkConfig), inputs, ImmutableMap.of(
              inputWithWarnings, expectedFirstInput,
              inputWithoutWarnings, expectedSecondInput));
      }
  
      @Test
      public void testStateIsClearedOnBeginTreeForLastVariableStatement() throws Exception {
          final DefaultConfiguration checkConfig = createModuleConfig(OneStatementPerLineCheck.class);
          checkConfig.addProperty("treatTryResourcesAsStatement", "true");
          final String file1 = getPath(
                  "InputOneStatementPerLineBeginTreeLastVariableResourcesStatementEnd1.java");
          final String file2 = getPath(
                  "InputOneStatementPerLineBeginTreeLastVariableResourcesStatementEnd2.java");
          final List<String> expectedFirstInput = List.of(
                  "8:59: " + getCheckMessage(MSG_KEY)
          );
          final List<String> expectedSecondInput = List.of(CommonUtil.EMPTY_STRING_ARRAY);
          final File[] inputs = {new File(file1), new File(file2)};
  
          verify(createChecker(checkConfig), inputs, ImmutableMap.of(
              file1, expectedFirstInput,
              file2, expectedSecondInput));
      }
  }
  