[Seaside] I can't access the WASession in a SeasideTesting session.

[Seb]

Hi,

I use SeasideTesting to test my application and I run into a problem 
every time I need to access the WASession:
- the component session (self component session) is always nil.

Note: I run #establishSession in the #setUp.


Any hints?
Thanks!
Seb.