changed to RSpec's expect syntax

I decided to change clearance to expect syntax for a project I was working on.  If, you want what I did, great!  If, not, you can just close this.

Please note, I have not done a poll request before.  If I have done it incorrectly, I apologize.
not to be what? How about `not_to be_present`? I know the previous expectation was `be` but I let's make it read a bit better here.