Tests

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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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
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 * published by the Free Software Foundation.
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 * 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
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 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
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package at.ssw.hotswap.test.structural;

import static org.junit.Assert.*;

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

import at.ssw.hotswap.HotSwapTool;

/**
 * Smallest test case for a hierarchy swap. A<B is changed to B<A.
 *
 * @author Thomas Wuerthinger
 */

public class HierarchySwapTest {

    // Version 0
    public static class A {

        public int value() {
            return 1;
        }
    }

    public static class B extends A {

        @Override
        public int value() {
            return super.value() * 2;
        }
    }

    public static class C {

        public boolean doInstanceCheckA(Object o) {
            return o instanceof A;
        }

        public boolean doInstanceCheckB(Object o) {
            return o instanceof B;
        }
    }

    public static class Base {

        public String className() {
            return "Base";
        }
    }

    public static class D extends Base {

        @Override
        public String className() {
            return "D";
        }

        public String superClassName() {
            return super.className();
        }
    }

    public static class E extends Base {

        @Override
        public String className() {
            return "E";
        }

        public String superClassName() {
            return super.className();
        }
    }

    public static class F extends Base {

        @Override
        public String className() {
            return "F";
        }

        public String superClassName() {
            return super.className();
        }
    }

    // Version 1
    public static class A___1 extends B___1 {

        @Override
        public int value() {
            return super.value() * 2;
        }
    }

    public static class B___1 {

        public int value() {
            return 4;
        }
    }

    public static class C___1 {

        public boolean doInstanceCheckA(Object o) {
            return o instanceof A;
        }

        public boolean doInstanceCheckB(Object o) {
            return o instanceof B;
        }
    }

    // Version 2
    public static class D___2 extends Base {

        @Override
        public String className() {
            return "D";
        }

        public String superClassName() {
            return super.className();
        }
    }

    public static class E___2 extends D {

        @Override
        public String className() {
            return "E";
        }

        @Override
        public String superClassName() {
            return super.className();
        }
    }

    public static class F___2 extends E {

        @Override
        public String className() {
            return "F";
        }

        @Override
        public String superClassName() {
            return super.className();
        }
    }

    // Version 3
    public static class D___3 extends E {

        @Override
        public String className() {
            return "D";
        }

        @Override
        public String superClassName() {
            return super.className();
        }
    }

    public static class E___3 extends F {

        @Override
        public String className() {
            return "E";
        }

        @Override
        public String superClassName() {
            return super.className();
        }
    }

    public static class F___3 extends Base {

        @Override
        public String className() {
            return "F";
        }

        public String superClassName() {
            return super.className();
        }
    }

    // Version 4
    public static class D___4 extends E {

        @Override
        public String className() {
            return "D";
        }

        @Override
        public String superClassName() {
            return super.className();
        }
    }

    public static class E___4 extends Base {

        @Override
        public String className() {
            return "E";
        }

        public String superClassName() {
            return super.className();
        }
    }

    public static class F___4 extends E {

        @Override
        public String className() {
            return "F";
        }

        @Override
        public String superClassName() {
            return super.className();
        }
    }

    @Before
    public void setUp() throws Exception {
        HotSwapTool.toVersion(HierarchySwapTest.class, 0);
        A a = new A();
        B b = new B();
        C c = new C();
        D d = new D();
        E e = new E();
        F f = new F();
    }

    @Test
    public void testHierarchySwap() {

        assert HotSwapTool.getCurrentVersion(HierarchySwapTest.class) == 0;

        A a = new A();
        B b = new B();

        assertEquals(1, a.value());
        assertEquals(2, b.value());
        assertTrue(b.getClass().getSuperclass().equals(A.class));
        assertFalse(a.getClass().getSuperclass().equals(B.class));

        HotSwapTool.toVersion(HierarchySwapTest.class, 1);

        assertEquals(8, a.value());
        assertEquals(4, b.value());
        assertFalse(b.getClass().getSuperclass().equals(A.class));
        assertTrue(a.getClass().getSuperclass().equals(B.class));

        HotSwapTool.toVersion(HierarchySwapTest.class, 0);

        assertEquals(1, a.value());
        assertEquals(2, b.value());
        assertTrue(b.getClass().getSuperclass().equals(A.class));
        assertFalse(a.getClass().getSuperclass().equals(B.class));
    }

    @Test
    public void testHierarchySwapWithInstanceOfTest() {

        assert HotSwapTool.getCurrentVersion(HierarchySwapTest.class) == 0;

        A a = new A();
        B b = new B();
        C c = new C();

        assertEquals(1, a.value());
        assertEquals(2, b.value());
        assertTrue(c.doInstanceCheckA(b));
        assertFalse(c.doInstanceCheckB(a));

        HotSwapTool.toVersion(HierarchySwapTest.class, 1);

        assertEquals(8, a.value());
        assertEquals(4, b.value());
        assertFalse(c.doInstanceCheckA(b));
        assertTrue(c.doInstanceCheckB(a));

        HotSwapTool.toVersion(HierarchySwapTest.class, 0);

        assertEquals(1, a.value());
        assertEquals(2, b.value());
        assertTrue(c.doInstanceCheckA(b));
        assertFalse(c.doInstanceCheckB(a));
    }

    @Test
    public void testHierarchySwapWithInstanceOf() {

        assert HotSwapTool.getCurrentVersion(HierarchySwapTest.class) == 0;

        A a = new A();
        B b = new B();

        assertEquals(1, a.value());
        assertEquals(2, b.value());
        assertTrue(b instanceof A);
        assertFalse(a instanceof B);

        HotSwapTool.toVersion(HierarchySwapTest.class, 1);

        assertEquals(8, a.value());
        assertEquals(4, b.value());
        assertFalse(b instanceof A);
        assertTrue(a instanceof B);

        HotSwapTool.toVersion(HierarchySwapTest.class, 0);

        assertEquals(1, a.value());
        assertEquals(2, b.value());
        assertTrue(b instanceof A);
        assertFalse(a instanceof B);
    }

    @Test
    public void testTripleSwap() {


        assert HotSwapTool.getCurrentVersion(HierarchySwapTest.class) == 0;

        D d = new D();
        E e = new E();
        F f = new F();

        assertEquals(d.superClassName(), "Base");
        assertEquals(e.superClassName(), "Base");
        assertEquals(f.superClassName(), "Base");

        HotSwapTool.toVersion(HierarchySwapTest.class, 2);

        assertEquals(d.superClassName(), "Base");
        assertEquals(e.superClassName(), "D");
        assertEquals(f.superClassName(), "E");

        HotSwapTool.toVersion(HierarchySwapTest.class, 3);

        assertEquals(d.superClassName(), "E");
        assertEquals(e.superClassName(), "F");
        assertEquals(f.superClassName(), "Base");

        HotSwapTool.toVersion(HierarchySwapTest.class, 4);

        assertEquals(d.superClassName(), "E");
        assertEquals(e.superClassName(), "Base");
        assertEquals(f.superClassName(), "E");

        HotSwapTool.toVersion(HierarchySwapTest.class, 3);

        assertEquals(d.superClassName(), "E");
        assertEquals(e.superClassName(), "F");
        assertEquals(f.superClassName(), "Base");

        HotSwapTool.toVersion(HierarchySwapTest.class, 2);

        assertEquals(d.superClassName(), "Base");
        assertEquals(e.superClassName(), "D");
        assertEquals(f.superClassName(), "E");

        HotSwapTool.toVersion(HierarchySwapTest.class, 0);

        assertEquals(d.superClassName(), "Base");
        assertEquals(e.superClassName(), "Base");
        assertEquals(f.superClassName(), "Base");
    }
}
 

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