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.javadoc.utils;
  
  import static com.google.common.truth.Truth.assertWithMessage;
  
  import java.util.List;
  
  import org.junit.jupiter.api.Test;
  
  import com.puppycrawl.tools.checkstyle.internal.utils.TestUtil;
  
  public class BlockTagUtilTest {
  
      @Test
      public void testHasPrivateConstructor() throws Exception {
          assertWithMessage("Constructor is not private")
                  .that(TestUtil.isUtilsClassHasPrivateConstructor(BlockTagUtil.class))
                  .isTrue();
      }
  
      @Test
      public void testExtractBlockTags() {
          final String[] text = {
              "/** @foo abc ",
              " * @bar def  ",
              "   @baz ghi  ",
              " * @qux jkl",
              " */",
          };
  
          final List<TagInfo> tags = BlockTagUtil.extractBlockTags(text);
          assertWithMessage("Invalid tags size")
              .that(tags)
              .hasSize(4);
  
          final TagInfo tag1 = tags.get(0);
          assertTagEquals(tag1, "foo", "abc", 1, 4);
  
          final TagInfo tag2 = tags.get(1);
          assertTagEquals(tag2, "bar", "def", 2, 3);
  
          final TagInfo tag3 = tags.get(2);
          assertTagEquals(tag3, "baz", "ghi", 3, 3);
  
          final TagInfo tag4 = tags.get(3);
          assertTagEquals(tag4, "qux", "jkl", 4, 3);
      }
  
      @Test
      public void testVersionStringFormat() {
          final String[] text = {
              "/** ",
              " * @version 1.0",
              " */",
          };
          final List<TagInfo> tags = BlockTagUtil.extractBlockTags(text);
          assertWithMessage("Invalid tags size")
              .that(tags)
              .hasSize(1);
          assertWithMessage("Invalid tag name")
              .that(tags.get(0).getName())
              .isEqualTo("version");
          assertWithMessage("Invalid tag value")
              .that(tags.get(0).getValue())
              .isEqualTo("1.0");
      }
  
      @Test
      public void testOddVersionString() {
          final String[] text = {
              "/**",
              " * Foo",
              " * @version 1.0 */"};
  
          final List<TagInfo> tags = BlockTagUtil.extractBlockTags(text);
          assertWithMessage("Invalid tags size")
              .that(tags)
              .hasSize(1);
          assertWithMessage("Invalid tag name")
              .that(tags.get(0).getName())
              .isEqualTo("version");
          assertWithMessage("Invalid tag value")
              .that(tags.get(0).getValue())
              .isEqualTo("1.0");
      }
  
      private static void assertTagEquals(TagInfo tag, String name, String value,
              int line, int column) {
          assertWithMessage("Invalid tag name")
              .that(tag.getName())
              .isEqualTo(name);
          assertWithMessage("Invalid tag value")
              .that(tag.getValue())
              .isEqualTo(value);
          assertWithMessage("Invalid tag line")
              .that(tag.getPosition().getLine())
              .isEqualTo(line);
          assertWithMessage("Invalid tag column")
              .that(tag.getPosition().getColumn())
              .isEqualTo(column);
      }
  
  }
  