We use unit test suites to verify the correctness of our virtual machine. Here you can access the source code of the tests.

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package at.ssw.hotswap.test.fields;

import static org.junit.Assert.*;

import org.junit.Before;
import org.junit.Test;

import at.ssw.hotswap.HotSwapTool;

 * Complex field test.
 * @author Thomas Wuerthinger

public class ComplexFieldTest {

    // Version 0
    public static class A {
        public byte byteFld = 10;
        public short shortFld = 20;
        public int intFld = 30;
        public long longFld = 40L;
        public float floatFld = 50.2F;
        public double doubleFld = 60.3D;
        public char charFld = 'b';
        public boolean booleanFld = true;
        public String stringFld = "OLD";

    // Version 1
    public static class A___1 {
        public byte byteFld = 11;
        public short shortFld = 22;
        public int intFld = 33;
        public long longFld = 44L;
        public float floatFld = 55.5F;
        public double doubleFld = 66.6D;
        public char charFld = 'c';
        public boolean booleanFld = false;
        public String stringFld = "NEW";

        // completely new instance fields are below
        public int intComplNewFld = 333;
        public long longComplNewFld = 444L;
        public String stringComplNewFld = "completely new String field";
    public void setUp() throws Exception {
        HotSwapTool.toVersion(ComplexFieldTest.class, 0);

     * Checks that the given object is unmodified (i.e. the values of the fields are correct)
     * @param a the object to be checked

    private void assertObjectOK(A a) {
        assertEquals(10, a.byteFld);
        assertEquals(20, a.shortFld);
        assertEquals(30, a.intFld);
        assertEquals(40L, a.longFld);
        assertEquals(50.2F, a.floatFld, 0.01);
        assertEquals(60.3D, a.doubleFld, 0.01);
        assertEquals('b', a.charFld);
        assertEquals(true, a.booleanFld);
        assertEquals("OLD", a.stringFld);

    public void testComplexFieldChange() {
        assert HotSwapTool.getCurrentVersion(ComplexFieldTest.class) == 0;
        A a = new A();
        HotSwapTool.toVersion(ComplexFieldTest.class, 1);
        HotSwapTool.toVersion(ComplexFieldTest.class, 0);

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