passing choice column additionalAttributes in AddFieldAsXml

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I am using a PnP solution to create a custom solution from

https://github.com/SharePoint/PnP/tree/master/Samples/Provisioning.ReR

The method AddFieldAsXml takes somes parameters

If i want to pass a choice column then how we go about puttingthe choices.

AddFieldAsXml(requestList, SiteRequestFields.StateML, SiteRequestFields.cmdMultipleDisplayName, SiteRequestFields.cmdMultipleDisplayId, "Choice", "Format='Dropdown' Xml='<Choices><Choice>Test1</Choice><Choice>Test2</Choice><Choice>Test3</Choice></Choices>'");

However the above code did not work.

Thanks

[#2]

Per link below, choice XML elements should be all caps (XML is case sensitive).  I haven't tested this yet though.

https://sharepoint.stackexchange.com/questions/199454/create-choice-column-in-sharepoint-list