Add extract controller logic for bypassing impression to bot? method

app/controllers/impressionist_controller.rb

@@ -41,10 +41,7 @@ module ImpressionistController
     private
 
     def bypass
-      Impressionist::Bots::WILD_CARDS.each do |wild_card|
-        return true if request.user_agent and request.user_agent.downcase.include? wild_card
-      end
-      Impressionist::Bots::LIST.include? request.user_agent
+      Impressionist::Bots.bot?(request.user_agent)
     end
 
     def unique_instance?(impressionable, unique_opts)

app/models/impressionist/bots.rb

@@ -1,5 +1,11 @@
 module Impressionist
   module Bots
+
+    def self.bot?(user_agent = nil)
+      return false if user_agent.nil?
+      WILD_CARDS.any? { |wc| user_agent.downcase.include?(wc) } || LIST.include?(user_agent)
+    end
+
     WILD_CARDS = ["bot","yahoo","slurp","google","msn","crawler"]
 
     LIST = ["<a href='http://www.unchaos.com/'> UnChaos </a> From Chaos To Order Hybrid Web Search Engine.(vadim_gonchar@unchaos.com)",

test_app/spec/models/bots_spec.rb

@@ -0,0 +1,27 @@
+require 'spec_helper'
+
+describe Impressionist::Bots do
+
+  describe "self.bot?" do
+    it "is true if user_agent is matches wild card" do
+      Impressionist::Bots.bot?("google.com bot").should be_true
+    end
+
+    it "is true if user_agent is on bot list" do
+      Impressionist::Bots.bot?("A-Online Search").should be_true
+    end
+
+    it "is false if user_agent is blank" do
+      Impressionist::Bots.bot?("").should be_false
+      Impressionist::Bots.bot?(nil).should be_false
+    end
+
+    it "is false if user_agent is safe" do
+      Impressionist::Bots.bot?('127.0.0.1').should be_false
+    end
+
+    it "is false if user_agent not given" do
+      Impressionist::Bots.bot?.should be_false
+    end
+  end
+end