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   *  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
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   */
  package org.apache.causeway.core.metamodel.facets.collections;
  
  import java.util.Optional;
  
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  
  import static org.hamcrest.CoreMatchers.is;
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.when;
  
  import org.apache.causeway.commons.collections.Can;
  import org.apache.causeway.core.metamodel._testing.MetaModelContext_forTesting;
  import org.apache.causeway.core.metamodel.context.MetaModelContext;
  import org.apache.causeway.core.metamodel.facetapi.FacetHolder;
  import org.apache.causeway.core.metamodel.facets.Mocking;
  import org.apache.causeway.core.metamodel.facets.collections.javautilcollection.JavaCollectionFacet;
  
  class JavaCollectionFacetTest {
  
      private MetaModelContext metaModelContext;
      private Mocking mocking = new Mocking();
  
  
      @BeforeEach
      void setUp() throws Exception {
          metaModelContext = MetaModelContext_forTesting.buildDefault();
      }
  
      @Test
      void firstElementForEmptyCollectionIsEmptyOptional() {
          var mockFacetHolder = mock(FacetHolder.class);
          when(mockFacetHolder.getMetaModelContext()).thenReturn(metaModelContext);
  
          var mockCollection = mocking.asPacked(Can.empty());
  
          var facet = new JavaCollectionFacet(mockFacetHolder);
          assertThat(facet.firstElement(mockCollection), is(Optional.empty()));
      }
  
  }
  