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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
   *  under the License.
   */
  package org.apache.causeway.core.metamodel.facets.object.callback;
  
  import java.util.Optional;
  
  import org.junit.jupiter.api.AfterEach;
  import org.junit.jupiter.api.BeforeEach;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  import org.apache.causeway.commons.collections.Can;
  import org.apache.causeway.commons.internal.reflection._MethodFacades;
  import org.apache.causeway.commons.internal.reflection._MethodFacades.MethodFacade;
  import org.apache.causeway.core.config.progmodel.ProgrammingModelConstants;
  import org.apache.causeway.core.metamodel.facets.FacetFactory;
  import org.apache.causeway.core.metamodel.facets.FacetFactoryTestAbstract;
  import org.apache.causeway.core.metamodel.facets.ImperativeFacet;
  import org.apache.causeway.core.metamodel.facets.object.callbacks.CallbackFacetFactory;
  
  abstract class CallbackFacetFactoryTestAbstract
  extends FacetFactoryTestAbstract {
  
      protected CallbackFacetFactory facetFactory;
  
      @BeforeEach
      protected void setUp() {
          facetFactory = new CallbackFacetFactory(getMetaModelContext());
      }
  
      @AfterEach
      protected void tearDown() {
          facetFactory = null;
      }
  
      /**
       * see also ObjectSupportFacetFactoryTestAbstract#assertPicksUp
       */
      protected void assertPicksUp(
              final int expectedCallbackCount,
              final FacetFactory facetFactory,
              final Class<?> type,
              final ProgrammingModelConstants.CallbackMethod callbackMethod,
              final Class<? extends ImperativeFacet> facetType) {
  
          objectScenario(type, (processClassContext, facetHolder) -> {
              //when
              facetFactory.process(processClassContext);
              //then
              var callbackMethods = callbackMethod.getMethodNames().stream()
                      .map(methodName->findMethodExact(type, methodName))
                      .flatMap(Optional::stream)
                      .map(_MethodFacades::regular)
                      .map(MethodFacade::asMethodElseFail)
                      .collect(Can.toCan());
  
              assertEquals(expectedCallbackCount, callbackMethods.size());
  
              var facet = facetHolder.getFacet(facetType);
              assertNotNull(facet);
              assertTrue(facet instanceof ImperativeFacet);
              var imperativeFacet = facet;
  
              callbackMethods.forEach(method->{
                  assertMethodWasRemoved(method);
                  assertTrue(imperativeFacet.getMethods()
                          .map(MethodFacade::asMethodElseFail).contains(method));
              });
          });
  
      }
  
  }
  