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.util.SortedSet;
  
  import org.junit.jupiter.api.Test;
  
  import com.puppycrawl.tools.checkstyle.DefaultConfiguration;
  import com.puppycrawl.tools.checkstyle.internal.utils.TestUtil;
  import com.puppycrawl.tools.checkstyle.utils.CommonUtil;
  
  /**
   * Tests to ensure that default message bundle is determined correctly.
   *
   */
  public class AbstractViolationReporterTest {
  
      private final AbstractCheck emptyCheck = new EmptyCheck();
  
      protected static DefaultConfiguration createModuleConfig(Class<?> clazz) {
          return new DefaultConfiguration(clazz.getName());
      }
  
      @Test
      public void testGetMessageBundleWithPackage() throws Exception {
          assertWithMessage("violation bundle differs from expected")
                  .that(TestUtil.<String>invokeStaticMethod(AbstractViolationReporter.class,
                          "getMessageBundle", "com.mycompany.checks.MyCoolCheck"))
                  .isEqualTo("com.mycompany.checks.messages");
      }
  
      @Test
      public void testGetMessageBundleWithoutPackage() throws Exception {
          assertWithMessage("violation bundle differs from expected")
                  .that(TestUtil.<String>invokeStaticMethod(AbstractViolationReporter.class,
                          "getMessageBundle", "MyCoolCheck"))
                  .isEqualTo("messages");
      }
  
      @Test
      public void testCustomId() {
          emptyCheck.setId("MyId");
          assertWithMessage("Id differs from expected")
                  .that(emptyCheck.getId())
                  .isEqualTo("MyId");
      }
  
      @Test
      public void testSeverity() throws Exception {
          final DefaultConfiguration config = createModuleConfig(emptyCheck.getClass());
          config.addMessage("severity", "error");
          emptyCheck.configure(config);
  
          assertWithMessage("Invalid severity level")
                  .that(emptyCheck.getSeverityLevel())
                  .isEqualTo(SeverityLevel.ERROR);
          assertWithMessage("Invalid severity")
                  .that(emptyCheck.getSeverity())
                  .isEqualTo("error");
      }
  
      @Test
      public void testCustomMessage() throws Exception {
          final DefaultConfiguration config = createModuleConfig(emptyCheck.getClass());
          config.addMessage("msgKey", "This is a custom violation.");
          emptyCheck.configure(config);
  
          emptyCheck.log(1, "msgKey");
  
          final SortedSet<Violation> messages = emptyCheck.getViolations();
  
          assertWithMessage("Amount of messages differs from expected")
                  .that(messages)
                  .hasSize(1);
          assertWithMessage("violation differs from expected")
                  .that(messages.first().getViolation())
                  .isEqualTo("This is a custom violation.");
      }
  
      @Test
      public void testCustomMessageWithParameters() throws Exception {
          final DefaultConfiguration config = createModuleConfig(emptyCheck.getClass());
          config.addMessage("msgKey", "This is a custom violation with {0}.");
          emptyCheck.configure(config);
  
          emptyCheck.log(1, "msgKey", "TestParam");
          final SortedSet<Violation> messages = emptyCheck.getViolations();
  
          assertWithMessage("Amount of messages differs from expected")
                  .that(messages)
                  .hasSize(1);
  
          assertWithMessage("violation differs from expected")
                  .that(messages.first().getViolation())
                  .isEqualTo("This is a custom violation with TestParam.");
      }
  
      @Test
      public void testCustomMessageWithParametersNegative() throws Exception {
          final DefaultConfiguration config = createModuleConfig(emptyCheck.getClass());
          config.addMessage("msgKey", "This is a custom violation {0.");
          emptyCheck.configure(config);
  
          try {
              emptyCheck.log(1, "msgKey", "TestParam");
              assertWithMessage("exception expected")
                      .fail();
          }
          catch (IllegalArgumentException ex) {
              assertWithMessage("Error violation is unexpected")
                      .that(ex.getMessage())
                      .isEqualTo("Unmatched braces in the pattern.");
          }
      }
  
      public static class EmptyCheck extends AbstractCheck {
  
          @Override
          public int[] getDefaultTokens() {
              return CommonUtil.EMPTY_INT_ARRAY;
          }
  
          @Override
          public int[] getAcceptableTokens() {
              return CommonUtil.EMPTY_INT_ARRAY;
          }
  
          @Override
          public int[] getRequiredTokens() {
              return CommonUtil.EMPTY_INT_ARRAY;
          }
  
      }
  
  }
  