AutoBean polymorphism test

gistfile1.java

import java.util.ArrayList;
import java.util.List;

import com.google.web.bindery.autobean.shared.AutoBean;
import com.google.web.bindery.autobean.shared.AutoBeanCodex;
import com.google.web.bindery.autobean.shared.AutoBeanFactory;
import com.google.web.bindery.autobean.shared.AutoBeanUtils;
import com.google.web.bindery.autobean.vm.AutoBeanFactorySource;

import junit.framework.TestCase;

public class Test extends TestCase {

  // A default Base bean
  // D1 and D2 extends from Base
  interface Base {
    Base concreteType();
  }
  interface D1 extends Base {
    String getField();
    void setField(String field);
  }
  interface D2 extends Base {
    int getField();
    void setField(int field);
  }

  // A bean that wraps a List<Base>
  public interface TestBean {
    List<Base> getList();
    void setList(List<Base> list);
  }

  // The factory used to obtain autobeans
  public interface Factory extends AutoBeanFactory {
    AutoBean<TestBean> testBean();
    AutoBean<D1> d1();
    AutoBean<D2> d2();
  }

  // The actual test
  public void testAutobean() {
    Factory factory = AutoBeanFactorySource.create(Factory.class);

    AutoBean<TestBean> autoBean = factory.testBean();
    TestBean bean = autoBean.as();
    bean.setList(new ArrayList<Base>());

    D1 d1 = factory.d1().as();
    d1.setField("string");
    D2 d2 = factory.d2().as();
    d2.setField(123456);

    bean.getList().add(d1);
    bean.getList().add(d2);

    // Encoding the built autobean
    String payload = AutoBeanCodex.encode(autoBean).getPayload();

    // Decoding a new autobean using the previous payload
    // and obtaining a new payload
    // (This could have happened on client-side, for instance)
    AutoBean<TestBean> decodedAutoBean =
        AutoBeanCodex.decode(factory, TestBean.class, payload);
    String payload2 = AutoBeanCodex.encode(decodedAutoBean).getPayload();

    // Fail
    assertTrue(AutoBeanUtils.deepEquals(autoBean, decodedAutoBean));
    // Fail expected:<{"list":[{["field":"string"},{"field":123456]}]}>
    //       but was:<{"list":[{[},{]}]}>
    assertEquals(payload, payload2);
  }
}