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 org.junit.jupiter.api.Test;
  import org.junitpioneer.jupiter.DefaultLocale;
  
  /**
   * Test cases for {@link SeverityLevel} enumeration.
   */
  public class SeverityLevelTest {
  
      /* Additional test for jacoco, since valueOf()
       * is generated by javac and jacoco reports that
       * valueOf() is uncovered.
       */
      @Test
      public void testSeverityLevelValueOf() {
          final SeverityLevel level = SeverityLevel.valueOf("INFO");
          assertWithMessage("Invalid severity level")
              .that(level)
              .isEqualTo(SeverityLevel.INFO);
      }
  
      @Test
      public void testMisc() {
          final SeverityLevel severityLevel = SeverityLevel.getInstance("info");
          assertWithMessage("Invalid getInstance result, should not be null")
              .that(severityLevel)
              .isNotNull();
          assertWithMessage("Invalid toString result")
              .that(severityLevel.toString())
              .isEqualTo("info");
          assertWithMessage("Invalid severity level name")
              .that(severityLevel.getName())
              .isEqualTo("info");
  
          try {
              SeverityLevel.getInstance("unknown");
              assertWithMessage("exception expected").fail();
          }
          catch (IllegalArgumentException ex) {
              assertWithMessage("Invalid exception message")
                  .that(ex.getMessage())
                  .isEqualTo("No enum constant "
                      + "com.puppycrawl.tools.checkstyle.api.SeverityLevel.UNKNOWN");
          }
      }
  
      @Test
      public void testMixedCaseSpaces() {
          assertWithMessage("Invalid getInstance result")
              .that(SeverityLevel.getInstance("IgnoRe "))
              .isEqualTo(SeverityLevel.IGNORE);
          assertWithMessage("Invalid getInstance result")
              .that(SeverityLevel.getInstance(" iNfo"))
              .isEqualTo(SeverityLevel.INFO);
          assertWithMessage("Invalid getInstance result")
              .that(SeverityLevel.getInstance(" WarniNg"))
              .isEqualTo(SeverityLevel.WARNING);
          assertWithMessage("Invalid getInstance result")
              .that(SeverityLevel.getInstance("    ERROR "))
              .isEqualTo(SeverityLevel.ERROR);
      }
  
      @DefaultLocale(language = "tr", country = "TR")
      @Test
      public void testMixedCaseSpacesWithDifferentLocales() {
          assertWithMessage("Invalid getInstance result")
              .that(SeverityLevel.getInstance("IgnoRe "))
              .isEqualTo(SeverityLevel.IGNORE);
          assertWithMessage("Invalid getInstance result")
              .that(SeverityLevel.getInstance(" iNfo"))
              .isEqualTo(SeverityLevel.INFO);
          assertWithMessage("Invalid getInstance result")
              .that(SeverityLevel.getInstance(" WarniNg"))
              .isEqualTo(SeverityLevel.WARNING);
          assertWithMessage("Invalid getInstance result")
              .that(SeverityLevel.getInstance("    ERROR "))
              .isEqualTo(SeverityLevel.ERROR);
      }
  
  }
  