Add a performance spec for start up time impact

Gemfile

@@ -1,6 +1,7 @@
 source 'https://rubygems.org'
 
 gem 'rails', '~> 5.0', '>= 5.0.0.1'
+gem 'sqlite3'
 gemspec
 gem 'bundler'
 gem 'rspec', '~> 3.4'

Gemfile.lock

@@ -134,6 +134,7 @@ GEM
       actionpack (>= 4.0)
       activesupport (>= 4.0)
       sprockets (>= 3.0.0)
+    sqlite3 (1.3.13)
     thor (0.19.1)
     thread_safe (0.3.5)
     tzinfo (1.2.2)
@@ -156,6 +157,7 @@ DEPENDENCIES
   rails (~> 5.0, >= 5.0.0.1)
   rdoc
   rspec (~> 3.4)
+  sqlite3
 
 BUNDLED WITH
    1.11.2

gemfiles/Gemfile.rails-4.2.x

@@ -1,6 +1,7 @@
 source 'https://rubygems.org'
 
 gem 'rails', '~> 4.2'
+gem 'sqlite3'
 gemspec :path => '../'
 gem 'bundler'
 gem 'rspec', '~> 3.4'

gemfiles/Gemfile.rails-5.0.x

@@ -1,6 +1,7 @@
 source 'https://rubygems.org'
 
 gem 'rails', '~> 5.0', '>= 5.0.0.1'
+gem 'sqlite3'
 gemspec :path => '../'
 gem 'bundler'
 gem 'rspec', '~> 3.4'

spec/helpers.rb

@@ -79,10 +79,16 @@ def create_random_string(random_string)
       end
     end
 
+    def run_in_rails_app_root_dir(&block)
+      Dir.chdir("#{root_dir}/spec/integration/rails-app-#{@version}") do
+        yield
+      end
+    end
+
     private
 
     def deploy_to_environment(env)
-      Dir.chdir("#{root_dir}/spec/integration/rails-app-#{@version}") do
+      run_in_rails_app_root_dir do
         unless system("eb deploy #{env}")
           raise "Could not deploy application to environment #{env}"
         end

spec/integration/preformance_spec.rb

@@ -0,0 +1,23 @@
+require 'spec_helper'
+require 'timeout'
+
+RAILS_START_UP_UPPER_BOUNDARY = 10 # in seconds
+describe "performance" do
+  before(:all) do
+    @rails_app = Helpers::RailsApp.new("#{Rails::VERSION::MAJOR}.#{Rails::VERSION::MINOR}")
+  end
+
+  describe "rails start up time" do
+    it "performs under #{RAILS_START_UP_UPPER_BOUNDARY} seconds" do
+      begin
+        Timeout::timeout(RAILS_START_UP_UPPER_BOUNDARY) do
+          @rails_app.run_in_rails_app_root_dir do
+            system("bundle exec rails runner \"puts 'hello world!'\" ")
+          end
+        end
+      rescue Timeout::Error
+        fail "Rails app has not started within #{RAILS_START_UP_UPPER_BOUNDARY} seconds"
+      end
+    end
+  end
+end