Add performance test generator

railties/lib/rails_generator/generators/components/performance_test/USAGE

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+Description:
+    Stubs out a new performance test. Pass the name of the test, either
+    CamelCased or under_scored, as an argument. The new test class is
+    generated in test/performance/testname_test.rb
+
+Example:
+    `./script/generate performance_test GeneralStories` creates a GeneralStories
+    performance test in test/performance/general_stories_test.rb

railties/lib/rails_generator/generators/components/performance_test/performance_test_generator.rb

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+class PerformanceTestGenerator < Rails::Generator::NamedBase
+  default_options :skip_migration => false
+
+  def manifest
+    record do |m|
+      # Check for class naming collisions.
+      m.class_collisions class_path, class_name, "#{class_name}Test"
+
+      # performance test directory
+      m.directory File.join('test/performance', class_path)
+
+      # performance test stub
+      m.template 'performance_test.rb', File.join('test/performance', class_path, "#{file_name}_test.rb")
+    end
+  end
+end

railties/lib/rails_generator/generators/components/performance_test/templates/performance_test.rb

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+require 'performance/test_helper'
+
+class <%= class_name %>Test < ActionController::PerformanceTest
+  # Replace this with your real tests.
+  def test_homepage
+    get '/'
+  end
+end