WeakReferenceExTest.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
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package com.sun.tools.visualvm.api.caching.impl;

import org.junit.After;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
import static org.junit.Assert.*;

/**
 *
 * @author Jaroslav Bachorik
 */
public class WeakReferenceExTest {

    public WeakReferenceExTest() {
    }

    @BeforeClass
    public static void setUpClass() throws Exception {
    }

    @AfterClass
    public static void tearDownClass() throws Exception {
    }

    @Before
    public void setUp() {
    }

    @After
    public void tearDown() {
    }

    /**
     * Test of equals method, of class WeakReferenceEx.
     */
    @Test
    public void testEqualsNonEmpty() {
        System.out.println("equals - non empty");
        WeakReferenceEx instance1 = new WeakReferenceEx("xxx");
        WeakReferenceEx instance2 = new WeakReferenceEx("xxx");
        // equals must yield the equals result of the referrents
        assertEquals(instance2, instance1);
        // also, the hashcodes must be the same for equaling references
        assertEquals(instance2.hashCode(), instance1.hashCode());
    }

    /**
     * Test of equals method, of class WeakReferenceEx.
     */
    @Test
    public void testEqualsEmpty() {
        System.out.println("equals - empty");
        WeakReferenceEx instance1 = new WeakReferenceEx("xxx");
        WeakReferenceEx instance2 = new WeakReferenceEx(null);
        WeakReferenceEx instance3 = new WeakReferenceEx(null);
        // equals for "non-null"x"null" must yield FALSE
        assertFalse(instance2.equals(instance1));
        // equals for "null"x"null" must yield FALSE
        assertFalse(instance2.equals(instance3));
    }

    @Test
    public void testNotEqualsNonEmpty() {
        System.out.println("equals - non empty");
        WeakReferenceEx instance1 = new WeakReferenceEx("xxx");
        WeakReferenceEx instance2 = new WeakReferenceEx("yyy");
        // equals must yield the equals result of the referrents
        assertFalse(instance2.equals(instance1));
        // also, the hashcodes must not be the same for non-equaling references
        assertFalse(instance2.hashCode() == instance1.hashCode());
    }
}