Testing MyFaces with Canoo's WebTest

[Matt Raible]

I'm trying to use Canoo's WebTest to test my JSF app.  I've found that I 
have to have JavaScript enabled in order to test commandLinks and such. 
 However, the problem I'm having is that WebTest throws a NPE on a page 
with a commandLink:

   [canoo] [appfuse] ERROR [main] Step.handleUnexpectedException(370) | 
Cannot
andle unexpected exception in step ClickButton at 
C:\Source\appfuse-jsf\test\we
\login.xml:6:  with (label="Login", stepId="Click the submit button", 
stepType=
clickbutton")
   [canoo] java.lang.RuntimeException: Script 'function clear_editUser() {
   [canoo]   var f = document.forms['editUser'];
   [canoo]   f.elements['editUser:_link_hidden_'].value=null;
   [canoo]   f.target='_self';
   [canoo] }
   [canoo] clear_editUser();
   [canoo] //' failed: java.lang.NullPointerException
   [canoo]     at 
com.meterware.httpunit.javascript.JavaScript$JavaScriptEngine
handleScriptException(JavaScript.java:199)
   [canoo]     at 
com.meterware.httpunit.javascript.JavaScript$JavaScriptEngine
executeScript(JavaScript.java:136)
   [canoo]     at 
com.meterware.httpunit.scripting.ScriptableDelegate.runScript

It looks like it's bombing on the generated clear_editUser() function. 
If I do a view source on my page, my guess is that the call to get the 
form is failing b/c the JavaScript is above the </form> - rather than 
below it.

Has anyone been successful in using tools like Canoo or jWebUnit to test 
their JSF apps?

Thanks,
Matt