Refactor filter receiver tests (#5991)
Refactor filter receiver tests (#5991)

* Refactor filter receiver tests

Signed-off-by: Ahmed Abdalla <c29d6ec4c8c360b3a81ac97ba12d96cc3c3c326e@redhat.com>

* missed cleanup

Signed-off-by: Ahmed Abdalla <c29d6ec4c8c360b3a81ac97ba12d96cc3c3c326e@redhat.com>

* set Subscriber URI with nil

Signed-off-by: Ahmed Abdalla <c29d6ec4c8c360b3a81ac97ba12d96cc3c3c326e@redhat.com>
knative/eventing,knative/eventing