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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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * version 2 for more details (a copy is included in the LICENSE file that
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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;
import at.ssw.hotswap.test.TestUtil;

/**
 * Test case for type narrowing.
 *
 * @author Thomas Wuerthinger
 */

public class TypeNarrowingHeapTest {

    // Version 0
    public static class A {

        int x = 1;
        int y = 2;
        int z = 3;

        public int value() {
            return x;
        }
    }

    public static class C {
        private A a;

        public C(A a) {
            this.a = a;
        }
    }

    public static class B extends A {

    }


    // Version 1
    public static class B___1 {
    }


    @Before
    public void setUp() throws Exception {
        HotSwapTool.toVersion(TypeNarrowingHeapTest.class, 0);
        A a = new A();
        B b = new B();
    }

    @Test
    public void testSimpleTypeNarrowing() {

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

        A a = convertBtoA(new B());

        assertEquals(1, a.value());

        // Cannot do conversion if A object is on the stack!
        a = null;

        HotSwapTool.toVersion(TypeNarrowingHeapTest.class, 1);

        TestUtil.assertException(NoSuchMethodError.class, new Runnable() {
            @Override
            public void run() {
                B b = new B();
                b.value();
            }
        });

        HotSwapTool.toVersion(TypeNarrowingHeapTest.class, 0);
        assert HotSwapTool.getCurrentVersion(TypeNarrowingHeapTest.class) == 0;
    }

    @Test
    public void testTypeNarrowingWithField() {
        C c = new C(new A());

        HotSwapTool.toVersion(TypeNarrowingHeapTest.class, 1);

        HotSwapTool.toVersion(TypeNarrowingHeapTest.class, 0);

        c = new C(convertBtoA(new B()));

        TestUtil.assertException(UnsupportedOperationException.class, new Runnable() {
            @Override
            public void run() {
                HotSwapTool.toVersion(TypeNarrowingHeapTest.class, 1);
            }
        });

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

        c.a = null;

        HotSwapTool.toVersion(TypeNarrowingHeapTest.class, 1);

        HotSwapTool.toVersion(TypeNarrowingHeapTest.class, 0);
    }
   
    // Method to enforce cast (otherwise bytecodes become invalid in version 2)
    public static A convertBtoA(Object b) {
        return (A)b;
    }

    @Test
    public void testTypeNarrowingWithArray() {
        final B b = new B();
        final A[] arr = new A[3];
        arr[0] = new A();

        assert b instanceof A;

        HotSwapTool.toVersion(TypeNarrowingHeapTest.class, 1);

        assert !(b instanceof A);

        TestUtil.assertException(ArrayStoreException.class, new Runnable() {
            @Override
            public void run() {
                arr[1] = b;
            }
        });

        HotSwapTool.toVersion(TypeNarrowingHeapTest.class, 0);

        arr[1] = new B();

        TestUtil.assertException(UnsupportedOperationException.class, new Runnable() {
            @Override
            public void run() {
                HotSwapTool.toVersion(TypeNarrowingHeapTest.class, 1);
            }
        });

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

        assert b instanceof A;

        arr[1] = new A();

        HotSwapTool.toVersion(TypeNarrowingHeapTest.class, 1);

        assert !(b instanceof A);

        HotSwapTool.toVersion(TypeNarrowingHeapTest.class, 0);

        assert b instanceof A;
    }
}
 

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