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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) 2006-2012 Rogério Liesenfeld
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.internal.expectations.invocation;

import mockit.internal.util.*;

public final class InvocationHandler extends DynamicInvocationResult
{
   public InvocationHandler(Object handler)
   {
      super(handler, Utilities.findNonPrivateHandlerMethod(handler));
   }

   @Override
   public Object produceResult(
      Object invokedObject, ExpectedInvocation invocation, InvocationConstraints constraints, Object[] args)
   {
      Object result = invokeMethodOnTargetObject(invokedObject, constraints, args);

      if (Boolean.FALSE.equals(result)) {
         String message = '"' + methodToInvoke.getName() + "\" failed on invocation to" + invocation.toString(args);
         throw new AssertionError(message);
      }

      return result;
   }
}