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   *  Licensed to the Apache Software Foundation (ASF) under one
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   *  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.persistence.jdo.metamodel.specloader;
  
  import org.junit.jupiter.api.AfterEach;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Disabled;
  import org.junit.jupiter.api.Test;
  
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  import static org.junit.jupiter.api.Assertions.assertNull;
  
  import org.apache.causeway.core.metamodel._testing.MetaModelContext_forTesting;
  import org.apache.causeway.core.metamodel.context.MetaModelContext;
  import org.apache.causeway.core.metamodel.facetapi.Facet;
  import org.apache.causeway.core.metamodel.facets.actcoll.typeof.TypeOfFacet;
  import org.apache.causeway.core.metamodel.facets.all.described.MemberDescribedFacet;
  import org.apache.causeway.core.metamodel.facets.all.described.ObjectDescribedFacet;
  import org.apache.causeway.core.metamodel.facets.all.named.MemberNamedFacet;
  import org.apache.causeway.core.metamodel.facets.all.named.ObjectNamedFacet;
  import org.apache.causeway.core.metamodel.facets.collections.CollectionFacet;
  import org.apache.causeway.core.metamodel.spec.ObjectSpecification;
  import org.apache.causeway.core.metamodel.specloader.SpecificationLoader;
  
  abstract class SpecificationLoaderTestAbstract {
  
      protected MetaModelContext metaModelContext;
  
      // is loaded by subclasses
      protected ObjectSpecification specification;
  
      @BeforeEach
      public void setUp() throws Exception {
  
          metaModelContext = MetaModelContext_forTesting.builder()
                  .build();
  
          specification = loadSpecification(metaModelContext.getSpecificationLoader());
      }
  
      @AfterEach
      public void tearDown() throws Exception {
          metaModelContext.getSpecificationLoader().disposeMetaModel();
      }
  
      protected abstract ObjectSpecification loadSpecification(SpecificationLoader reflector);
  
      @Test
      public void testCollectionFacet() throws Exception {
          final Facet facet = specification.getFacet(CollectionFacet.class);
          assertNull(facet);
      }
  
      @Test
      public void testTypeOfFacet() throws Exception {
          final TypeOfFacet facet = specification.getFacet(TypeOfFacet.class);
          assertNull(facet);
      }
  
      @Test
      public void testNamedFaced() throws Exception {
          var facet =
  
                  specification.lookupFacet(ObjectNamedFacet.class)
                  .map(Facet.class::cast)
                  .or(()->specification.lookupFacet(MemberNamedFacet.class))
                  .orElse(null);
  
          assertNotNull(facet);
      }
  
      @Test @Disabled("we allow descriptions to be absent - no need to install empty fallbacks")
      public void testDescriptionFacet() throws Exception {
          var facet =
  
                  specification.lookupFacet(ObjectDescribedFacet.class)
                  .map(Facet.class::cast)
                  .or(()->specification.lookupFacet(MemberDescribedFacet.class))
                  .orElse(null);
  
          assertNotNull(facet);
      }
  
  }
  