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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.bcel.verifier;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  import java.io.BufferedInputStream;
  import java.io.InputStream;
  import java.io.PrintWriter;
  import java.nio.file.Files;
  import java.nio.file.Paths;
  import java.util.ArrayList;
  import java.util.List;
  
  import org.apache.bcel.AbstractTestCase;
  import org.apache.bcel.classfile.ClassParser;
  import org.apache.bcel.classfile.JavaClass;
  import org.apache.bcel.classfile.Method;
  import org.apache.bcel.generic.EmptyVisitor;
  import org.apache.bcel.generic.InstructionHandle;
  import org.apache.bcel.generic.InstructionList;
  import org.apache.bcel.generic.SWAP;
  import org.apache.commons.lang3.StringUtils;
  import org.eclipse.jdt.internal.compiler.batch.Main;
  import org.junit.jupiter.api.Test;
  
  public class VerifierMainTestCase extends AbstractTestCase {
  
      @Test
      public void testSWAP() throws Exception {
          final String[] argv = { "src/test/java/org/apache/bcel/data/SWAP.java", "-g", "-source", "1.4", "-target", "1.4", "-d", "target/test-classes" };
          new Main(new PrintWriter(System.out), new PrintWriter(System.err), false/*systemExit*/, null/*options*/, null/*progress*/).compile(argv);
          final String javaAgent = getJavaAgent();
          final List<String> args = new ArrayList<>();
          args.add("java");
          if (javaAgent != null) {
              args.add(javaAgent.replace("jacoco.exec", "jacoco_org.apache.bcel.data.SWAP.exec"));
          }
          args.add("-cp");
          args.add(System.getProperty("java.class.path"));
          args.add("org.apache.bcel.verifier.Verifier");
          args.add("org/apache/bcel/data/SWAP.class");
          final ProcessBuilder pb = new ProcessBuilder(args);
          pb.redirectErrorStream(true);
          final Process p = pb.start();
          try (BufferedInputStream is = new BufferedInputStream(p.getInputStream())) {
              final byte[] buff = new byte[2048];
              final StringBuilder sb = new StringBuilder();
              for (int len; (len = is.read(buff)) != -1;) {
                  sb.append(new String(buff, 0, len));
              }
              final String output = sb.toString();
              assertEquals(0, p.waitFor(), output);
              assertEquals(0, StringUtils.countMatches(output, "VERIFIED_REJECTED"), output);
              assertEquals(6, StringUtils.countMatches(output, "VERIFIED_OK"), output);
          }
          // Class has passed the JustIce verifier, but now we need to ensure that the SWAP instruction is in the compiled class.
          final List<SWAP> swapInstructionsList = new ArrayList<>();
          final EmptyVisitor swapCollector = new EmptyVisitor() {
              @Override
              public void visitSWAP(final SWAP obj) {
                  swapInstructionsList.add(obj);
                  super.visitSWAP(obj);
              }
          };
          try (InputStream in = Files.newInputStream(Paths.get("target/test-classes/org/apache/bcel/data/SWAP.class"))) {
              final ClassParser classParser = new ClassParser(in, "SWAP.class");
              final JavaClass javaClass = classParser.parse();
              final Method method = javaClass.getMethod(org.apache.bcel.data.SWAP.class.getMethod("getTestConstructor", Class.class));
              final byte[] code = method.getCode().getCode();
              final InstructionList instructionList = new InstructionList(code);
              for (final InstructionHandle instructionHandle : instructionList) {
                  instructionHandle.accept(swapCollector);
              }
          }
          assertEquals(1, swapInstructionsList.size());
      }
  }