AbstractCircularReferenceTest.java

/*
 * Copyright (C) 2004, 2005 Joe Walnes.
 * Copyright (C) 2006, 2007 XStream Committers.
 * All rights reserved.
 *
 * The software in this package is published under the terms of the BSD
 * style license a copy of which has been included with this distribution in
 * the LICENSE.txt file.
 * 
 * Created on 07. May 2004 by Joe Walnes
 */
package com.thoughtworks.acceptance;


public abstract class AbstractCircularReferenceTest extends AbstractAcceptanceTest {

    protected void setUp() throws Exception {
        super.setUp();
        xstream.alias("person", Person.class);
    }

    public static class Person {
        public String firstname;
        public Person likes;
        public Person loathes;

        public Person() {
        }

        public Person(String name) {
            this.firstname = name;
        }
    }

    public void testCircularReference() {
        Person bob = new Person("bob");
        Person jane = new Person("jane");
        bob.likes = jane;
        jane.likes = bob;

        String xml = xstream.toXML(bob);

        Person bobOut = (Person) xstream.fromXML(xml);
        assertEquals("bob", bobOut.firstname);
        Person janeOut = bobOut.likes;

        assertEquals("jane", janeOut.firstname);

        assertSame(bobOut.likes, janeOut);
        assertSame(bobOut, janeOut.likes);
    }

    public void testCircularReferenceToSelf() {
        Person bob = new Person("bob");
        bob.likes = bob;

        String xml = xstream.toXML(bob);

        Person bobOut = (Person) xstream.fromXML(xml);
        assertEquals("bob", bobOut.firstname);
        assertSame(bobOut, bobOut.likes);
    }

    public void testDeepCircularReferences() {
        Person bob = new Person("bob");
        Person jane = new Person("jane");
        Person ann = new Person("ann");
        Person poo = new Person("poo");

        bob.likes = jane;
        bob.loathes = ann;
        ann.likes = jane;
        ann.loathes = poo;
        poo.likes = jane;
        poo.loathes = ann;
        jane.likes = jane;
        jane.loathes = bob;

        String xml = xstream.toXML(bob);
        Person bobOut = (Person) xstream.fromXML(xml);
        Person janeOut = bobOut.likes;
        Person annOut = bobOut.loathes;
        Person pooOut = annOut.loathes;

        assertEquals("bob", bobOut.firstname);
        assertEquals("jane", janeOut.firstname);
        assertEquals("ann", annOut.firstname);
        assertEquals("poo", pooOut.firstname);

        assertSame(janeOut, bobOut.likes);
        assertSame(annOut, bobOut.loathes);
        assertSame(janeOut, annOut.likes);
        assertSame(pooOut, annOut.loathes);
        assertSame(janeOut, pooOut.likes);
        assertSame(annOut, pooOut.loathes);
        assertSame(janeOut, janeOut.likes);
        assertSame(bobOut, janeOut.loathes);
    }

}