From b58b1ee4bac31d25b4d5de6afe7a9daefe8bf641 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 9a386356f..52c2b21b7 100644
--- a/Gemfile
+++ b/Gemfile
@@ -46,4 +46,5 @@ end
 
 group :development, :test do
   gem 'rubocop', '~> 0.34.0', require: false
+  gem 'rugged'
 end
diff --git a/Rakefile b/Rakefile
index 58a49598e..fbb4a9333 100644
--- a/Rakefile
+++ b/Rakefile
@@ -48,3 +48,38 @@ task default: [:test, :rubocop]
 
 desc 'CI test task'
 task :ci => [:default]
+
+require 'rugged'
+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
+  @repo = Rugged::Repository.new('.')
+  ref   = @repo.head
+
+  actual_branch = ref.name
+
+  set_commit('master')
+  old_bench = Benchmark.realtime { Rake::Task['benchmark_tests'].execute }
+
+  set_commit(actual_branch)
+  new_bench = Benchmark.realtime { Rake::Task['benchmark_tests'].execute }
+
+  puts 'Results ============================'
+  puts "------------------------------------~> (Branch) MASTER"
+  puts old_bench
+  puts "------------------------------------"
+
+  puts "------------------------------------~> (Actual Branch) #{actual_branch}"
+  puts new_bench
+  puts "------------------------------------"
+end
+
+def set_commit(ref)
+  @repo.checkout ref
+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