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.imports;
  
  import static com.google.common.truth.Truth.assertWithMessage;
  
  import org.junit.jupiter.api.Test;
  
  public class ClassImportRuleTest {
  
      @Test
      public void testClassImportRule() {
          final ClassImportRule rule = new ClassImportRule(true, false, "pkg.a", false);
          assertWithMessage("Class import rule should not be null")
              .that(rule)
              .isNotNull();
          assertWithMessage("Invalid access result")
              .that(rule.verifyImport("asda"))
              .isEqualTo(AccessResult.UNKNOWN);
          assertWithMessage("Invalid access result")
              .that(rule.verifyImport("p"))
              .isEqualTo(AccessResult.UNKNOWN);
          assertWithMessage("Invalid access result")
              .that(rule.verifyImport("pkga"))
              .isEqualTo(AccessResult.UNKNOWN);
          assertWithMessage("Invalid access result")
              .that(rule.verifyImport("pkg.a"))
              .isEqualTo(AccessResult.ALLOWED);
          assertWithMessage("Invalid access result")
              .that(rule.verifyImport("pkg.a.b"))
              .isEqualTo(AccessResult.UNKNOWN);
          assertWithMessage("Invalid access result")
              .that(rule.verifyImport("pkg"))
              .isEqualTo(AccessResult.UNKNOWN);
      }
  
      @Test
      public void testClassImportRuleRegexpSimple() {
          final ClassImportRule rule = new ClassImportRule(true, false, "pkg.a", true);
          assertWithMessage("Class import rule should not be null")
              .that(rule)
              .isNotNull();
          assertWithMessage("Invalid access result")
              .that(rule.verifyImport("asda"))
              .isEqualTo(AccessResult.UNKNOWN);
          assertWithMessage("Invalid access result")
              .that(rule.verifyImport("p"))
              .isEqualTo(AccessResult.UNKNOWN);
          assertWithMessage("Invalid access result")
              .that(rule.verifyImport("pkga"))
              .isEqualTo(AccessResult.UNKNOWN);
          assertWithMessage("Invalid access result")
              .that(rule.verifyImport("pkg.a"))
              .isEqualTo(AccessResult.ALLOWED);
          assertWithMessage("Invalid access result")
              .that(rule.verifyImport("pkg.a.b"))
              .isEqualTo(AccessResult.UNKNOWN);
          assertWithMessage("Invalid access result")
              .that(rule.verifyImport("pkg"))
              .isEqualTo(AccessResult.UNKNOWN);
      }
  
      @Test
      public void testClassImportRuleRegexp() {
          final ClassImportRule rule = new ClassImportRule(true, false, "pk[gx]\\.a", true);
          assertWithMessage("Class import rule should not be null")
              .that(rule)
              .isNotNull();
          assertWithMessage("Invalid access result")
              .that(rule.verifyImport("asda"))
              .isEqualTo(AccessResult.UNKNOWN);
          assertWithMessage("Invalid access result")
              .that(rule.verifyImport("p"))
              .isEqualTo(AccessResult.UNKNOWN);
          assertWithMessage("Invalid access result")
              .that(rule.verifyImport("pkga"))
              .isEqualTo(AccessResult.UNKNOWN);
          assertWithMessage("Invalid access result")
              .that(rule.verifyImport("pkg.a"))
              .isEqualTo(AccessResult.ALLOWED);
          assertWithMessage("Invalid access result")
              .that(rule.verifyImport("pkx.a"))
              .isEqualTo(AccessResult.ALLOWED);
          assertWithMessage("Invalid access result")
              .that(rule.verifyImport("pkg.a.b"))
              .isEqualTo(AccessResult.UNKNOWN);
          assertWithMessage("Invalid access result")
              .that(rule.verifyImport("pkg"))
              .isEqualTo(AccessResult.UNKNOWN);
      }
  
  }
  