content: /*
   *  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.causeway.viewer.wicket.model.models.test;
  
  import java.util.Arrays;
  import java.util.List;
  
  import org.junit.jupiter.api.Test;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  import org.apache.causeway.core.metamodel.commons.ClassExtensions;
  
  class LowestCommonSuperclassClosureTest {
  
      static class Animal {}
      static class Mineral {}
      static class Vegetable {}
      static class Mammal extends Animal {}
      static class Lion extends Mammal {}
  
      @Test
      public void nothingInCommon() {
          assertCommonOfListIs(Arrays.asList(new Animal(), new Mineral(), new Vegetable()), Object.class);
      }
  
      @Test
      public void superclassInCommon() {
          assertCommonOfListIs(Arrays.asList(new Animal(), new Mammal()), Animal.class);
      }
  
      @Test
      public void subclassInCommon() {
          assertCommonOfListIs(Arrays.asList(new Lion(), new Lion()), Lion.class);
      }
  
      // -- HELPER
  
      private static void assertCommonOfListIs(final List<Object> list, final Class<?> expected) {
          var commonSuperClassFinder = new ClassExtensions.CommonSuperclassFinder();
          list.forEach(commonSuperClassFinder::collect);
          assertEquals(expected, commonSuperClassFinder.getCommonSuperclass().get());
      }
  
  }
  