Looking for jar dependency for Junit Integration (WsdlProject)

I am fairly new to soapUI and I used it to test using soapUI by with soap request and response.

Now I am planning write some tests that integrates with Junit with existing test frameworks.
Read the Junit Integration in documentation, when I am trying to do that the class reference is missing.
WsdlProject project = new WsdlProject(sProjectName);
Appreciate for any pointers
I am soapUI user, not soapUIPro ( i am doing eval of that too)