Fix random test failure that can't be reproduced locally

Problem/Motivation

// @todo Fix random test failure that can't be reproduced locally.
// My best guess is a different version of the clientside_validation.module
// is being enabled via DrupalCI.

While writing tests I notice this comment and I would like to see the errors that are triggered.
First I'll create a patch removing:

$this->assert(TRUE);
return;

and trigger the tests.