public static Bear filledBear()
    {
        Bear bear = new Bear();
        bear.someBearField = "bearField";
        bear.normalBodyTemperature = 20f;
        bear.properName = "bear";
        return bear;
    }
Test for polymorphic serialization.
<p>
See {@link RuntimeDerivativeField} for details.

@author David Yu
@created Jan 15, 2011
protostuff-runtime/src/test/java/io/protostuff/runtime/PolymorphicSerializationTest.java