Devise be_signed_in rspec matcher

devise_matchers.rb

module DeviseMatchers
  class BeSignedIn
    attr_reader :warden, :scope_or_resource

    def initialize warden, scope_or_resource=nil
      @warden = warden
      @scope_or_resource = scope_or_resource
    end

    def matches? actual
      if scope_or_resource.nil?
        Devise.mappings.any? { |scope| warden.authenticated? scope }
      else
        scope = Devise::Mapping.find_scope!(scope_or_resource)
        warden.authenticated? scope
      end
    end
  end

  def be_signed_in scope_or_resource=nil
    BeSignedIn.new warden, scope_or_resource
  end
end

RSpec.configure do |config|
  config.include DeviseMatchers, type: :controller
end