test should not change the scope of a flag

    // Switch to a global flag, the accounting rules.
    $this->flag->setGlobal(TRUE);

We don't support changing the scope of a flag, so the test should not do this either.

This probably makes the test meaningless at the moment, as the test first flags a node by two different users, then changes the flag to global. A global flag would never have the same node flagged by two users!