public static Tiger filledTiger()
    {
        Tiger tiger = new Tiger();
        tiger.someTigerField = "tigerField";
        tiger.normalBodyTemperature = 30f;
        tiger.properName = "tiger";
        return tiger;
    }
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