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JMockit is a Java toolkit for developer (unit/integration) testing. It contains mocking APIs and other tools, supporting both JUnit and TestNG. The mocking APIs allow all kinds of Java code, without testability restrictions, to be tested in isolation from selected dependencies.

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/*
 * Copyright (c) 2006-2013 Rogério Liesenfeld
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.internal.mockups;

import mockit.external.asm4.*;
import mockit.internal.*;
import mockit.internal.startup.*;
import mockit.internal.state.*;

public final class ClassStubbing
{
   private final Class realClass;

   public ClassStubbing(Class realClass) { this.realClass = realClass; }

   public void stubOut()
   {
      byte[] modifiedClassFile = stubOutClass();

      String classDesc = Type.getInternalName(realClass);
      TestRun.mockFixture().addRedefinedClass(classDesc, realClass, modifiedClassFile);
   }

   private byte[] stubOutClass()
   {
      if (realClass.isInterface() || realClass.isArray()) {
         throw new IllegalArgumentException("Not a modifiable class: " + realClass.getName());
      }

      ClassReader rcReader = ClassFile.createReaderFromLastRedefinitionIfAny(realClass);
      ClassVisitor rcWriter = new StubOutModifier(rcReader);
      rcReader.accept(rcWriter, 0);
      byte[] modifiedClassFile = rcWriter.toByteArray();

      Startup.redefineMethods(realClass, modifiedClassFile);

      return modifiedClassFile;
   }

   public void stubOutAtStartup() { stubOutClass(); }
}