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 InlineTagUtilTest {
  
      @Test
      public void testHasPrivateConstructor() throws Exception {
          assertWithMessage("Constructor is not private")
                  .that(TestUtil.isUtilsClassHasPrivateConstructor(InlineTagUtil.class))
                  .isTrue();
      }
  
      @Test
      public void testExtractInlineTags() {
          final String[] text = {
              "/** @see elsewhere ",
              " * {@link List }, {@link List link text }",
              "   {@link List#add(Object) link text}",
              " * {@link Class link text}",
              " */"};
          final List<TagInfo> tags = InlineTagUtil.extractInlineTags(text);
  
          assertWithMessage("Unexpected tags size")
              .that(tags)
              .hasSize(4);
  
          assertTag(tags.get(0), "link", "List", 2, 4);
          assertTag(tags.get(1), "link", "List link text", 2, 19);
          assertTag(tags.get(2), "link", "List#add(Object) link text", 3, 4);
          assertTag(tags.get(3), "link", "Class link text", 4, 4);
      }
  
      @Test
      public void testMultiLineLinkTag() {
          final String[] text = {
              "/**",
              " * {@link foo",
              " *        bar baz}",
              " */"};
  
          final List<TagInfo> tags = InlineTagUtil.extractInlineTags(text);
  
          assertWithMessage("Unexpected tags size")
              .that(tags)
              .hasSize(1);
          assertTag(tags.get(0), "link", "foo bar baz", 2, 4);
      }
  
      @Test
      public void testCollapseWhitespace() {
          final String[] text = {
              "/**",
              " * {@code     foo\t\t   bar   baz\t    }",
              " */"};
  
          final List<TagInfo> tags = InlineTagUtil.extractInlineTags(text);
  
          assertWithMessage("Unexpected tags size")
              .that(tags)
              .hasSize(1);
          assertTag(tags.get(0), "code", "foo bar baz", 2, 4);
      }
  
      @Test
      public void extractInlineTags() {
          final String[] source = {
              "  {@link foo}",
          };
  
          final List<TagInfo> tags = InlineTagUtil.extractInlineTags(source);
  
          assertWithMessage("Unexpected tags size")
              .that(tags)
              .hasSize(1);
  
          final TagInfo tag = tags.get(0);
          assertTag(tag, "link", "foo", 1, 3);
      }
  
      @Test
      public void testBadInputExtractInlineTagsLineFeed() {
          try {
              InlineTagUtil.extractInlineTags("abc\ndef");
              assertWithMessage("IllegalArgumentException expected").fail();
          }
          catch (IllegalArgumentException ex) {
              assertWithMessage("Unexpected error message")
                      .that(ex.getMessage())
                      .contains("newline");
          }
      }
  
      @Test
      public void testBadInputExtractInlineTagsCarriageReturn() {
          try {
              InlineTagUtil.extractInlineTags("abc\rdef");
              assertWithMessage("IllegalArgumentException expected").fail();
          }
          catch (IllegalArgumentException ex) {
              assertWithMessage("Invalid error message")
                      .that(ex.getMessage())
                      .contains("newline");
          }
      }
  
      private static void assertTag(TagInfo tag, String name, String value, int line, int col) {
          assertWithMessage("Unexpected tags name")
              .that(tag.getName())
              .isEqualTo(name);
          assertWithMessage("Unexpected tags value")
              .that(tag.getValue())
              .isEqualTo(value);
          assertWithMessage("Unexpected tags position")
              .that(tag.getPosition().getLine())
              .isEqualTo(line);
          assertWithMessage("Unexpected tags position")
              .that(tag.getPosition().getColumn())
              .isEqualTo(col);
      }
  
  }
  