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.core.metamodel.objects;
  
  import java.util.List;
  import java.util.stream.Collectors;
  
  import org.junit.jupiter.api.Test;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  import org.apache.causeway.commons.internal.reflection._GenericResolver;
  import org.apache.causeway.core.metamodel.specloader.typeextract.TypeExtractor;
  
  class TypeExtractorMethodReturnTest {
  
      @Test
      void ignoresVoidType() throws Exception {
  
          class CustomerRepository {
              @SuppressWarnings("unused")
              public void findCustomers() {
              }
          }
  
          final Class<?> clazz = CustomerRepository.class;
          var method = _GenericResolver.testing.resolveMethod(clazz, "findCustomers");
          var classes = TypeExtractor.streamMethodReturn(method).collect(Collectors.toSet());
          assertEquals(0, classes.size());
      }
  
      @Test
      void shouldFindGenericTypes() throws Exception {
  
          class Customer {
          }
          class CustomerRepository {
              @SuppressWarnings("unused")
              public List<Customer> findCustomers() {
                  return null;
              }
          }
  
          final Class<?> clazz = CustomerRepository.class;
          var method = _GenericResolver.testing.resolveMethod(clazz, "findCustomers");
  
          var classes = TypeExtractor.streamMethodReturn(method).collect(Collectors.toSet());
  
          assertEquals(2, classes.size());
          assertTrue(classes.contains(java.util.List.class));
          assertTrue(classes.contains(Customer.class));
  
      }
  
      @Test
      void shouldFindGenericTypes_thatUseAWildcard() throws Exception {
  
          class Customer {
          }
          class CustomerRepository {
              @SuppressWarnings("unused")
              public List<? extends Customer> findCustomers() {
                  return null;
              }
          }
  
          final Class<?> clazz = CustomerRepository.class;
          var method = _GenericResolver.testing.resolveMethod(clazz, "findCustomers");
  
          var classes = TypeExtractor.streamMethodReturn(method).collect(Collectors.toSet());
  
          assertEquals(2, classes.size());
          assertTrue(classes.contains(java.util.List.class));
          assertTrue(classes.contains(Customer.class));
  
      }
  
  }
  