HTTP Request Methods Limiting Arguments

Check out this RSpec test from a Rails application:

# spec/controllers/chapters_controller_spec.rb
describe ChaptersController do
  describe '#create' do
    it 'creates a chapter' do
      expect do
        post :create, chapter: FactoryGirl.attributes_for(:chapter)
      end.to change(Chapter, :count).by(1)
    end
  end
end

The code after :create will soon be deprecated.

5.0+ versions of Rails will only accept keyword arguments for ActionController::TestCase HTTP request methods.

Here's that same test, minus the deprecation warnings I encountered upgrading to the first Rails 5 release candidate:

# spec/controllers/chapters_controller_spec.rb
describe ChaptersController do
  describe '#create' do
    it 'creates a chapter' do
      expect do
        post :create, params: { chapter: { title: 'Change', body: 'Change is coming!' } }
      end.to change(Chapter, :count).by(1)
    end
  end
end