Add a benchmark suite

Add a benchmark that measures the time it takes to delegate to the view
context.

Author: dasch

Gemfile

@@ -9,4 +9,5 @@ platform :ruby do
   gem 'github-markup'
   gem 'rails', '~> 4.2.0', require: false
   gem 'rspec-rails', require: false
+  gem 'benchmark-ips', require: false
 end

perf/component_benchmark.rb

@@ -0,0 +1,41 @@
+require 'bundler/setup'
+require 'benchmark/ips'
+
+ENV["RAILS_ENV"] = "test"
+
+require_relative '../spec/dummy/config/environment'
+
+class TestPresenter < Curly::Presenter
+  def hello_with_delegation
+    some_helper
+  end
+
+  def hello_without_delegation
+    not_some_helper
+  end
+
+  private
+
+  def not_some_helper
+  end
+end
+
+class TestContext
+  def some_helper
+  end
+end
+
+context = TestContext.new
+presenter = TestPresenter.new(context)
+
+Benchmark.ips do |x|
+  x.report "presenter method that delegates to the view context" do
+    presenter.hello_with_delegation
+  end
+
+  x.report "presenter method that doesn't delegate to the view context" do
+    presenter.hello_without_delegation
+  end
+
+  x.compare!
+end