Ability to use byebug easily while developing/testing

.gitignore

@@ -5,3 +5,4 @@ bin
 *.gemfile.lock
 .ruby-version
 .ruby-gemset
+.byebug_history

rack-attack.gemspec

@@ -41,4 +41,9 @@ Gem::Specification.new do |s|
   #
   # See https://github.com/guard/guard-minitest/pull/131
   s.add_development_dependency 'guard'
+
+  # byebug only works with MRI
+  if RUBY_ENGINE == "ruby"
+    s.add_development_dependency 'byebug'
+  end
 end

spec/spec_helper.rb

@@ -15,6 +15,10 @@ rescue LoadError
   #nothing to do here
 end
 
+if RUBY_ENGINE == "ruby"
+  require "byebug"
+end
+
 class MiniTest::Spec
 
   include Rack::Test::Methods