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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.commons.internal.reflection;
  
  import java.util.ArrayList;
  
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  import org.apache.causeway.commons.collections.Can;
  import org.apache.causeway.commons.internal._Constants;
  
  class GenericsTest {
  
      Class<?> typeUnderTest;
      Can<String> fieldUnderTest;
      Can<String> methodUnderTest(){ return null; };
  
      @BeforeEach
      void setUp() throws Exception {
          typeUnderTest = (new ArrayList<String>()).getClass();
      }
  
      @Test
      void streamGenericTypeArgumentsOfType() {
  
          var actualTypeArgs = _Generics.streamGenericTypeArgumentsOfType(typeUnderTest)
          .collect(Can.toCan());
  
          // impossible, so empty
          assertEquals(Can.empty(), actualTypeArgs);
      }
  
      @Test
      void streamGenericTypeArgumentsOfMethodReturnType() throws NoSuchMethodException, SecurityException {
  
          var methodUnderTest = this.getClass().getDeclaredMethod("methodUnderTest", _Constants.emptyClasses);
  
          var actualTypeArgs = _Generics.streamGenericTypeArgumentsOfMethodReturnType(methodUnderTest)
          .collect(Can.toCan());
  
          assertEquals(Can.of(String.class), actualTypeArgs);
      }
  
      @Test
      void streamGenericTypeArgumentsOfField() throws NoSuchFieldException, SecurityException {
  
          var fieldUnderTest = this.getClass().getDeclaredField("fieldUnderTest");
  
          var actualTypeArgs = _Generics.streamGenericTypeArgumentsOfField(fieldUnderTest)
          .collect(Can.toCan());
  
          assertEquals(Can.of(String.class), actualTypeArgs);
      }
  
  }
  