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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
    *
   *   https://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
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   * KIND, either express or implied.  See the License for the
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  package org.apache.bcel.verifier.tests;
  
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  
  import java.io.IOException;
  import java.io.OutputStream;
  
  import org.apache.bcel.Const;
  import org.apache.bcel.generic.ClassGen;
  import org.apache.bcel.generic.ConstantPoolGen;
  import org.apache.bcel.generic.InstructionConst;
  import org.apache.bcel.generic.InstructionFactory;
  import org.apache.bcel.generic.InstructionHandle;
  import org.apache.bcel.generic.InstructionList;
  import org.apache.bcel.generic.MethodGen;
  import org.apache.bcel.generic.Type;
  
  public abstract class TestReturn03Creator extends TestCreator {
      private final InstructionFactory instructionFactory;
      private final ConstantPoolGen constantPoolGen;
      private final ClassGen classGen;
      private final Type returnType;
      private final String genClassSuffix;
  
      protected TestReturn03Creator(final Type returnType, final String genClassSuffix) {
          classGen = new ClassGen(TEST_PACKAGE + ".TestReturn03" + genClassSuffix, "java.lang.Object", "TestReturn03.java", Const.ACC_PUBLIC | Const.ACC_SUPER,
                  new String[] {});
  
          constantPoolGen = classGen.getConstantPool();
          instructionFactory = new InstructionFactory(classGen, constantPoolGen);
          this.returnType = returnType;
          this.genClassSuffix = genClassSuffix;
      }
  
      @Override
      public void create(final OutputStream out) throws IOException {
          createMethod_0();
          createMethod_1();
          classGen.getJavaClass().dump(out);
      }
  
      private void createMethod_0() {
          final InstructionList il = new InstructionList();
          final MethodGen method = new MethodGen(Const.ACC_PUBLIC, Type.VOID, Type.NO_ARGS, new String[] {}, "<init>", TEST_PACKAGE + ".TestReturn03", il,
                  constantPoolGen);
  
          final InstructionHandle ih_0 = il.append(InstructionFactory.createLoad(Type.OBJECT, 0));
          assertNotNull(ih_0); // TODO why is this not used
          il.append(instructionFactory.createInvoke("java.lang.Object", "<init>", Type.VOID, Type.NO_ARGS, Const.INVOKESPECIAL));
          final InstructionHandle ih_4 = il.append(InstructionFactory.createReturn(Type.VOID));
          assertNotNull(ih_4); // TODO why is this not used
          method.setMaxStack();
          method.setMaxLocals();
          classGen.addMethod(method.getMethod());
          il.dispose();
      }
  
      private void createMethod_1() {
          final InstructionList il = new InstructionList();
          final MethodGen method = new MethodGen(Const.ACC_PUBLIC | Const.ACC_STATIC, Type.INT, Type.NO_ARGS, new String[] {}, "test3",
                  TEST_PACKAGE + ".TestReturn03" + genClassSuffix, il, constantPoolGen);
  
          final InstructionHandle ih_0 = il.append(InstructionConst.ACONST_NULL);
          assertNotNull(ih_0); // TODO why is this not used
          il.append(InstructionFactory.createReturn(returnType));
          method.setMaxStack();
          method.setMaxLocals();
          classGen.addMethod(method.getMethod());
          il.dispose();
      }
  }