Cleaned up tests so they run without an app

lib/mile_marker.rb

@@ -12,7 +12,7 @@ def initialize_mile_marker(request = nil)
 
     def add_initialize_mile_marker()
       init_code = initialize_mile_marker()
-      return if init_code.blank?
+      return if init_code.nil? || init_code.empty?
       response.body.gsub! /<\/(head)>/i, init_code + '</\1>' if response.body.respond_to?(:gsub!)
     end
   end
@@ -21,7 +21,9 @@ class MileMarker
     # The environments in which to enable the Mile Marker functionality to run.  Defaults
     # to 'development' only.
     @@environments = ['development']
-    cattr_accessor :environments
+    class << self 
+      attr_accessor :environments
+    end
 
     def self.options
       @options ||= {

test/test_helper.rb

@@ -3,7 +3,7 @@
 ENV['RAILS_ENV'] = 'test'
 
 require 'test/unit'
-require File.expand_path(File.join(File.dirname(__FILE__), '../../../../config/environment.rb'))
+require File.join(File.dirname(File.dirname(__FILE__)), "lib", "mile_marker")
 require 'ostruct'
 
 module MockResponse
@@ -12,4 +12,4 @@ def response
   end
 end
 Test::Unit::TestCase.send :include, MockResponse
-Thoughtbot::MileMarkerHelper.send :include, MockResponse
+Thoughtbot::MileMarkerHelper.send :include, MockResponse