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JMockit is a Java toolkit for automated developer testing. It contains APIs for the creation of the objects to be tested, for mocking dependencies, and for faking external APIs; JUnit (4 & 5) and TestNG test runners are supported. It also contains an advanced code coverage tool.

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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 edu.umd.cs.findbugs.annotations.NonNull;
import edu.umd.cs.findbugs.annotations.Nullable;

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;
        }
    }
}