Correct Pythonism that slipped into spec tests.

In Ruby, the "and" operator has extremely low precedence
and is not generally what you want to use.
See http://devblog.avdi.org/2010/08/02/using-and-and-or-in-ruby/
Merge pull request #409 from candlepin/awood/ruby_correction

Correct Pythonism that slipped into spec tests.