public static Elephant filledElephant()
    {
        Elephant elephant = new Elephant();
        elephant.someElephantField = "elephantField";
        elephant.normalBodyTemperature = 25f;
        elephant.properName = "elephant";
        return elephant;
    }
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