/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You under the Apache License, Version 2.0
    * (the "License"); you may not use this file except in compliance with
    * the License.  You may obtain a copy of the License at
    *
    *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.commons.lang3.reflect;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  
  import org.apache.commons.lang3.AbstractLangTest;
  import org.apache.commons.lang3.reflect.testbed.AnotherChild;
  import org.apache.commons.lang3.reflect.testbed.AnotherParent;
  import org.apache.commons.lang3.reflect.testbed.Grandchild;
  import org.junit.jupiter.api.Test;
  
  /**
   * Unit tests InheritanceUtils
   */
  public class InheritanceUtilsTest extends AbstractLangTest {
  
      @Test
      public void testConstructor() throws Exception {
          assertNotNull(InheritanceUtils.class.getConstructor().newInstance());
      }
  
      @Test
      public void testDistanceDisjoint() {
          assertEquals(-1, InheritanceUtils.distance(Boolean.class, String.class));
      }
  
      @Test
      public void testDistanceEqual() {
          assertEquals(0, InheritanceUtils.distance(AnotherChild.class, AnotherChild.class));
      }
  
      @Test
      public void testDistanceEqualObject() {
          assertEquals(0, InheritanceUtils.distance(Object.class, Object.class));
      }
  
      @Test
      public void testDistanceGreaterThanZero() {
          assertEquals(1, InheritanceUtils.distance(AnotherChild.class, AnotherParent.class));
          assertEquals(1, InheritanceUtils.distance(Grandchild.class, AnotherChild.class));
          assertEquals(2, InheritanceUtils.distance(Grandchild.class, AnotherParent.class));
          assertEquals(3, InheritanceUtils.distance(Grandchild.class, Object.class));
      }
  
      @Test
      public void testDistanceNullChild() {
          assertEquals(-1, InheritanceUtils.distance(null, Object.class));
      }
  
      @Test
      public void testDistanceNullParent() {
          assertEquals(-1, InheritanceUtils.distance(Object.class, null));
      }
  
      @Test
      public void testDistanceNullParentNullChild() {
          assertEquals(-1, InheritanceUtils.distance(null, null));
      }
  
      @Test
      public void testDistanceReverseParentChild() {
          assertEquals(-1, InheritanceUtils.distance(Object.class, Grandchild.class));
      }
  }