public void RoundTrip_Properties(string propertyName, object value)
{
Delta <DeltaModel> delta = new Delta <DeltaModel>();
Type propertyType;
Assert.True(delta.TryGetPropertyType(propertyName, out propertyType));
Assert.True(delta.TrySetPropertyValue(propertyName, value));
object retrievedValue;
delta.TryGetPropertyValue(propertyName, out retrievedValue);
Assert.Equal(value, retrievedValue);
}