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.api;
  
  import static com.google.common.truth.Truth.assertWithMessage;
  
  import java.io.File;
  
  import org.junit.jupiter.api.Test;
  
  import com.puppycrawl.tools.checkstyle.AbstractModuleTestSupport;
  import com.puppycrawl.tools.checkstyle.utils.CommonUtil;
  
  public class FileSetCheckTest
      extends AbstractModuleTestSupport {
  
      @Override
      protected String getPackageLocation() {
          return "com/puppycrawl/tools/checkstyle/api/fileset";
      }
  
      @Test
      public void testTranslation() throws Exception {
          final Configuration checkConfig =
              createModuleConfig(TestFileSetCheck.class);
          final String[] expected = CommonUtil.EMPTY_STRING_ARRAY;
          verify(checkConfig, getPath("InputFileSetIllegalTokens.java"), expected);
  
          assertWithMessage("destroy() not called by Checker")
                  .that(TestFileSetCheck.isDestroyed())
                  .isTrue();
      }
  
      @Test
      public void testProcessCallsFinishBeforeCallingDestroy() throws Exception {
          final Configuration checkConfig =
              createModuleConfig(TestFileSetCheck.class);
          final String[] expected = CommonUtil.EMPTY_STRING_ARRAY;
  
          verify(checkConfig, getPath("InputFileSetIllegalTokens.java"), expected);
  
          assertWithMessage("FileContent should be available during finishProcessing() call")
                  .that(TestFileSetCheck.isFileContentAvailable())
                  .isTrue();
      }
  
      public static class TestFileSetCheck extends AbstractFileSetCheck {
  
          private static boolean destroyed;
          private static boolean fileContentAvailable;
          private static FileContents contents;
  
          @Override
          public void destroy() {
              destroyed = true;
          }
  
          public static boolean isDestroyed() {
              return destroyed;
          }
  
          public static boolean isFileContentAvailable() {
              return fileContentAvailable;
          }
  
          @Override
          protected void processFiltered(File file, FileText fileText) {
              contents = new FileContents(fileText);
          }
  
          @Override
          public void finishProcessing() {
              fileContentAvailable = contents != null;
          }
  
      }
  
  }
  