From 952ab0438ff8ed6e87a681e42c2a608af5770e22 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jo=C3=A3o=20Moura?= <joaomdmoura@gmail.com>
Date: Tue, 31 Mar 2015 20:41:50 -0300
Subject: [PATCH] AMS Benchmark tests #832

Adding a benchmak test structure to help contributors to keep track
of how their PR will impact overall performance.

It enables developers to create test inside of tests/benchmark.

This implementation adds a rake task: ```rake benchmark``` that checkout
one commit before, run the test of  tests/benchmark, then mover back to
the last commit and run it again. By comparing the benchmark results between
both commits the contributor will notice if and how much  his contribution
will impact overall performance.
---
 Gemfile                                   |  1 +
 Rakefile                                  | 35 ++++++++++++++++
 test/benchmark/serialization_benchmark.rb | 50 +++++++++++++++++++++++
 3 files changed, 86 insertions(+)
 create mode 100644 test/benchmark/serialization_benchmark.rb

diff --git a/Gemfile b/Gemfile
index 67246f247..4acd87f3b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -45,4 +45,5 @@ end
 
 group :development, :test do
   gem 'rubocop', '~> 0.36', require: false
+  gem 'git'
 end
diff --git a/Rakefile b/Rakefile
index 04c28a1a8..695fcb84e 100644
--- a/Rakefile
+++ b/Rakefile
@@ -74,3 +74,38 @@ end
 
 desc 'CI test task'
 task :ci => [:default]
+
+require 'git'
+require 'benchmark'
+Rake::TestTask.new :benchmark_tests do |t|
+  t.libs << "test"
+  t.test_files = FileList['test/**/*_benchmark.rb']
+  t.ruby_opts = ['-r./test/test_helper.rb']
+  t.verbose = true
+end
+
+task :benchmark do
+  @git = Git.init('.')
+  ref  = @git.current_branch
+
+  actual = run_benchmark_spec ref
+  master = run_benchmark_spec 'master'
+
+  @git.checkout(ref)
+
+  puts "\n\nResults ============================\n"
+  puts "------------------------------------~> (Branch) MASTER"
+  puts master
+  puts "------------------------------------\n\n"
+
+  puts "------------------------------------~> (Actual Branch) #{ref}"
+  puts actual
+  puts "------------------------------------"
+end
+
+def run_benchmark_spec(ref)
+  @git.checkout(ref)
+  response = Benchmark.realtime { Rake::Task['benchmark_tests'].invoke }
+  Rake::Task['benchmark_tests'].reenable
+  response
+end
diff --git a/test/benchmark/serialization_benchmark.rb b/test/benchmark/serialization_benchmark.rb
new file mode 100644
index 000000000..8fccc44e8
--- /dev/null
+++ b/test/benchmark/serialization_benchmark.rb
@@ -0,0 +1,50 @@
+require 'test_helper'
+
+module ActionController
+  module Serialization
+    class SerializerTest < ActionController::TestCase
+      class PostController < ActionController::Base
+
+        def render_with_cache_enable
+          comment = Comment.new({ id: 1, body: 'ZOMG A COMMENT' })
+          author  = Author.new(id: 1, name: 'Joao Moura.')
+          post    = Post.new({ id: 1, title: 'New Post', blog:nil, body: 'Body', comments: [comment], author: author })
+
+          render json: post
+        end
+      end
+
+      tests PostController
+
+      def test_render_with_cache_enable
+        ActionController::Base.cache_store.clear
+        get :render_with_cache_enable
+
+        expected = {
+          id: 1,
+          title: 'New Post',
+          body: 'Body',
+          comments: [
+            {
+              id: 1,
+              body: 'ZOMG A COMMENT' }
+          ],
+          blog: {
+            id: 999,
+            name: 'Custom blog'
+          },
+          author: {
+            id: 1,
+            name: 'Joao Moura.'
+          }
+        }
+
+        assert_equal 'application/json', @response.content_type
+        assert_equal expected.to_json, @response.body
+
+        get :render_with_cache_enable
+        assert_equal expected.to_json, @response.body
+      end
+    end
+  end
+end