package org.apidesign.deadlock;

import org.junit.Test;

import static org.junit.Assert.*;

public class SynchronizedFieldsInternallyTest {

    public SynchronizedFieldsInternallyTest() {

    }

    @Test

    public void increment() {

        SynchronizedFieldsInternally instance = new SynchronizedFieldsInternally();

        instance.increment();

    }

    @Test

    public void unsafeDecrement() {

        SynchronizedFieldsInternally instance = new SynchronizedFieldsInternally();

        try {

            instance.unsafeDecrement();

        } catch (java.lang.AssertionError ex) {

            // OK

            return;

        }

        fail("This will fail as unsafeDecrement is not synchronized, and that" +

            "is why it cannot access the field using getter and setter"

        );

    }

    @Test

    public void fixUnsafeDecrementFromOutside() {

        SynchronizedFieldsInternally instance = new SynchronizedFieldsInternally();

        try {

            synchronized (instance) {

                instance.unsafeDecrement();

            }

        } catch (AssertionError ex) {

            // OK

            return;

        }

        fail("Unlike the SynchronizedFieldsTest, the fix by wrapping instance" +

            "into own synchronized block will not help, neither any other" +

            "fix, the lock is really private"

        );

    }

}