This is how I'm testing my policies using MiniTest. I've created a few helper functions:

# test_helper.rb
def assert_permit(user, record, action)
  msg = "User #{user.inspect} should be permitted to #{action} #{record}, but isn't permitted"
  assert permit(user, record, action), msg
end

def refute_permit(user, record, action)
  msg = "User #{user.inspect} should NOT be permitted to #{action} #{record}, but is permitted"
  refute permit(user, record, action), msg
end

def permit(user, record, action)
  cls = self.class.superclass.to_s.gsub(/Test/, '')
  cls.constantize.new(user, record).public_send("#{action.to_s}?")
end

And then for each policy file:

# post_policy_test.rb
require 'test_helper'

class PostPolicyTest < ActiveSupport::TestCase
  before do
    @account = build_stubbed(:account)
    @administrator = build_stubbed(:administrator, account: @account)
    @employee = build_stubbed(:employee, account: @account)
    @post = build_stubbed(:post, account: @account)
  end

  describe "for an administrator" do
    it { assert_permit @administrator, :post, :index }
    it { assert_permit @administrator, @post, :show }
    it { assert_permit @administrator, @post, :new }
    it { assert_permit @administrator, @post, :create }
    it { assert_permit @administrator, @post, :edit }
    it { assert_permit @administrator, @post, :update }
    it { assert_permit @administrator, @post, :destroy }
  end

  describe "for an employee" do
    it { refute_permit @employee, :post, :index }
    it { refute_permit @employee, @post, :show }
    it { refute_permit @employee, @post, :new }
    it { refute_permit @employee, @post, :create }
    it { refute_permit @employee, @post, :edit }
    it { refute_permit @employee, @post, :update }
    it { refute_permit @employee, @post, :destroy }
  end

  describe "for a guest" do
    it { refute_permit nil, :post, :index }
    it { refute_permit nil, @post, :show }
    it { refute_permit nil, @post, :new }
    it { refute_permit nil, @post, :create }
    it { refute_permit nil, @post, :edit }
    it { refute_permit nil, @post, :update }
    it { refute_permit nil, @post, :destroy }
  end
end

Hope this helps. If anybody has improvements, please share.

Minitest? #204

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