Shared context for Pundit Policy specs

policy.rb

# spec/support/shared_contexts/policy.rb
# require this file from rails_helper.rb
require 'pundit/rspec'

RSpec.shared_context "Policy" do
  let(:user) { build_stubbed(:user) }
  subject { described_class }
  let(:model_class) { described_class.to_s.chomp('Policy').constantize }
  let(:permitted_attributes) do
    described_class.new(User.new, model_class).permitted_attributes
  end
  let(:scope) { Pundit.policy_scope!(user, model_class) }
end

RSpec.configure do |config|
  config.include_context "Policy", type: :policy
end