(#6830) Fix overly stubbed tests

In Ruby 1.9 calling .each on a stub calls to_a, and if you're not
stubbing to_a you get:

unexpected invocation: #<Mock:option1>.to_a()

Could have stubbed to_a also, but less stubbing is better in these cases

Reviewed-by: Jesse Wolfe <jesse@puppetlabs.com>