[Catalyst] Setting flash for tests

[Robert Rothenberg]

The Login controller, on a successful login, will redirect to the location
in $c->{flash}->{next}, if it is set. (Basically, if the user visits a page
that requires a login, he is redirected to the login page, and then is
redirected back to the original page.)

As far as I can tell, it works alright.

I am unsure how to test this using Catalyst::Test, though.

How can I set the "next" variable so as to test redirection?

Thanks,
Rob