Is there any default test suit for ext-gwt applications? [ex: Junit for java applications]

Sample Test Case Example:

Let us suppose I have a simple form panel with few GXT controls like Text Field and Labels.
  • Need to validate whether all required fields are filled with valid values or not? Some times values are filled based on ASYNC calls.
  • Need to validate server calls on submit with RPC calls?

Is there any applications to test such cases? Do we need to test client code and server code separately or can perform both at a time.

Thanks & Regards
Rambabu Kokkiligadda.