Require spec helper before running tests

Rakefile

@@ -6,6 +6,7 @@ require 'rspec/core/rake_task'
 Bundler::GemHelper.install_tasks
 
 RSpec::Core::RakeTask.new do |task|
+  task.rspec_opts = "-r ./test_app/spec/spec_helper.rb"
   task.pattern = "./test_app/spec/**/*_spec.rb"
 end