README.md in solidus_support-0.3.3 vs README.md in solidus_support-0.4.0

@@ -22,64 +22,40 @@
 SolidusSupport::Migration[5.0] # same as `ActiveRecord::Migration[5.0]`
 ```
 
 There's no reason to use `SolidusSupport::Migration[5.0]` over `ActiveRecord::Migration[5.0]`, but it is provided.
 
-### Testing Helpers
+### Engine Extensions
 
-This gem provides some useful helpers for RSpec to setup an extension's test
-environment easily.
+This extension provides a module that extends `Rails::Engine` functionalities
+to support loading correctly the decorators class created into an extension
+both for development and production enviroments.
 
-Into your extension's spec/spec_helper.rb:
+To use it just include the provided module in the Engine as follow:
 
 ```ruby
-require "solidus_support/extension/feature_helper"
-```
+module SolidusExtensionName
+  class Engine < Rails::Engine
+    engine_name 'solidus_extension_name'
 
-This helper loads configuration needed to run extensions feature specs
-correctly, setting up Capybara and configuring Rails test application
-to precompile assets before the first feature spec.
-
-This helper requires the `rails_helper`, also provided by this gem and
-requireable as a stand-alone helper.
-
-By doing:
-
-```ruby
-require "solidus_support/extension/rails_helper"
+    include SolidusSupport::EngineExtensions::Decorators
+    # ...
+  end
+end
 ```
 
-extension's test suite will have all Rails related tests configuration,
-like authorization helpers, Solidus core factories, url helpers, and
-other helpers to easily work with Solidus Config.
+To make it work, be sure to remove the previous implementation from the
+Engine, that should be something like:
 
-This `rails_helper` in turn requires the basic `spec_helper`, which is
-responsible to load a basic RSpec configuration, which could be needed
-in all extensions. It is also requireable as a stand-alone helper with:
-
 ```ruby
-require "solidus_support/extension/spec_helper"
-```
+def self.activate
+  Dir.glob(File.join(root, "app/**/*_decorator*.rb")) do |c|
+    Rails.configuration.cache_classes ? require(c) : load(c)
+  end
+end
 
-### Coverage Collection
-
-The gem also includes a SimpleCov configuration that will send your test
-coverage information directly to Codecov.io. Simply add this at the top
-of your `spec/spec_helper.rb`:
-
-```ruby
-require "solidus_support/extension/coverage"
+config.to_prepare(&method(:activate).to_proc)
 ```
-
-**Note: Make sure to add this at the VERY TOP of your spec_helper,
-otherwise you'll get skewed coverage reports!**
-
-If your extension is in a public repo and being tested on Travis or
-CircleCI, there's nothing else you need to do - you'll get coverage
-reports for free!
-
-If your setup is more complex, look at the [SimpleCov](https://github.com/colszowka/simplecov)
-and [codecov-ruby](https://github.com/codecov/codecov-ruby) docs.
 
 ## Development
 
 After checking out the repo, run `bin/setup` to install dependencies. You can also run `bin/console` for an interactive prompt that will allow you to experiment.