Unit testing - Integration/Code gen tools

I was wondering if any1 came across unit tests on code gen tools. I talk about mulesoft/oracle/tibco/emc etc. where you drag and drop stuff and code is generated(xml formats/somehow).

In such a case, as a developer - 2 questions

1. What is a unit test with codegen tools anyway?
2. I'm still developing functionality, but a codegen tool only covers the fact that compilation is successful - not really if my unit tests pass.