How to use SoapUI API to Create Test Cases and Steps

I need to create a SoapUI test suite and test cases programmatically using Java and the SoapUI API. I’m able to create the SoapUI project and import a WSDL into that project but I am having problems understanding which classes I use to create the test suite, test cases, test steps, and assertions. I’ve read the SoapUI API Javadoc, but are there sample code snippets and/or documentation I can use to learn which classes I would use and how to use those classes?