Don't test if invalid key is valid.

spec/factories_spec.rb

 require 'spec_helper'
 
 FactoryGirl.factories.map(&:name).each do |factory_name|
+  next if :key_with_a_space_in_the_middle == factory_name
   describe "#{factory_name} factory" do
     it 'should be valid' do
       build(factory_name).should be_valid