dcevm/dcevm/src/test/java7/com/github/dcevm/test/structural/AnonymousClassInMethodTest.java

package com.github.dcevm.test.structural;

import org.junit.Assert;
import org.junit.Before;

import static com.github.dcevm.test.util.HotSwapTestHelper.__toVersion__;
import static com.github.dcevm.test.util.HotSwapTestHelper.__version__;

/**
 * Test insertion and swap of anonymous classes.
 */
public class AnonymousClassInMethodTest {

    public static interface I {
        public boolean m();
    };

    public static interface I2 {};

    // Version 0
    public static class A {
        public boolean test() {
            I anonymous = new I() {
                @Override
                public boolean m() {
                    return true;
                }
            };
            return anonymous.m();
        }
    }

    // Version 1
    public static class A___1 {
        public boolean test() {
            I2 insertedAnonymous = new I2() {};

            I anonymous = new I() {
                @Override
                public boolean m() {
                    return false;
                }
            };
            return anonymous.m();
        }
    }


    @Before
    public void setUp() throws Exception {
        __toVersion__(0);
    }

    // TODO this test fails, because conent of A$1 is now interface I2 instead of interface I (not compatible change)
    // HotswapAgent plugin AnonymousClassPatch solves this on Java instrumentation level by exchanging content of class files.
    // @see https://github.com/HotswapProjects/HotswapAgent/tree/master/HotswapAgent/src/main/java/org/hotswap/agent/plugin/jvm
    //@Test
    public void testAnonymous() {
        assert __version__() == 0;
        Assert.assertTrue(new A().test());
        __toVersion__(1);
        Assert.assertFalse(new A().test());
        __toVersion__(0);
        Assert.assertTrue(new A().test());
    }
}