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JMockit is a Java toolkit for automated developer testing. It contains mocking/faking APIs and a code coverage tool, 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 JMockit developers
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.internal.expectations;

import javax.annotation.*;

final class FailureState
{
   @Nonnull private final Thread testThread;
   @Nullable private Error errorThrownInAnotherThread;

   /**
    * Holds an error associated to an ExpectedInvocation that is to be reported to the user.
    * 
    * This field is also set if and when an unexpected invocation is detected, so that any future
    * invocations in this same phase execution can rethrow the original error instead of throwing a
    * new one, which would hide the original.
    * Such a situation can happen when test code or the code under test contains a "catch" or
    * "finally" block where a mock invocation is made after a previous such invocation in the "try"
    * block already failed.
    */
   @Nullable private Error errorThrown;

   FailureState() { testThread = Thread.currentThread(); }

   @Nullable Error getErrorThrownInAnotherThreadIfAny() { return errorThrownInAnotherThread; }
   @Nullable Error getErrorThrown() { return errorThrown; }
   void setErrorThrown(@Nullable Error error) { errorThrown = error; }
   void clearErrorThrown() { errorThrown = null; }

   void reportErrorThrownIfAny() {
      if (errorThrown != null) {
         if (testThread == Thread.currentThread()) {
            throw errorThrown;
         }

         errorThrownInAnotherThread = errorThrown;
      }
   }
}