/*
    * 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.jxpath.ri.model;
  
  import java.util.Collections;
  
  import org.apache.commons.jxpath.AbstractJXPathTest;
  import org.apache.commons.jxpath.JXPathContext;
  import org.junit.jupiter.api.Test;
  
  /**
   * Be sure empty lists/sets/arrays work.
   */
  public class EmptyCollectionTest extends AbstractJXPathTest {
  
      public static class HasChild {
  
          private final Object child;
  
          /**
           * Constructs a new EmptyCollectionTest.HasChild instance.
           */
          public HasChild(final Object child) {
              this.child = child;
          }
  
          public Object getChild() {
              return child;
          }
      }
  
      @Test
      public void testEmptyArray() {
          assertXPathPointerIterator(JXPathContext.newContext(new Object[0]), "/*", list());
      }
  
      @Test
      public void testEmptyChildArray() {
          assertXPathPointerIterator(JXPathContext.newContext(new HasChild(new Object[0])), "/child/*", list());
      }
  
      @Test
      public void testEmptyChildList() {
          assertXPathPointerIterator(JXPathContext.newContext(new HasChild(Collections.EMPTY_LIST)), "/child/*", Collections.EMPTY_LIST);
      }
  
      @Test
      public void testEmptyChildSet() {
          assertXPathPointerIterator(JXPathContext.newContext(new HasChild(Collections.EMPTY_SET)), "/child/*", Collections.EMPTY_SET);
      }
  
      @Test
      public void testEmptyList() {
          assertXPathPointerIterator(JXPathContext.newContext(Collections.EMPTY_LIST), "/*", Collections.EMPTY_LIST);
      }
  
      @Test
      public void testEmptySet() {
          assertXPathPointerIterator(JXPathContext.newContext(Collections.EMPTY_SET), "/*", Collections.EMPTY_SET);
      }
  }