RSpec to test a cancan ability of 'create'

ability.rb

class Ability
  include CanCan::Ability
  def initialize(user)
    can :create, Something
  end
end

ability_spec.rb

require 'spec_helper'

describe Ability do
  it "allows user to create something" do
    user = User.new
    expect(user).to be_able_to(:create, Something)
  end
end

spec_helper.rb

...
require "cancan/matchers"
RSpec.configure do |config|
  ...
end
...