CanCanCan Issue

main.rb

begin
  require 'bundler/inline'
rescue LoadError => e
  $stderr.puts 'Bundler version 1.10 or later is required. Please update your Bundler'
  raise e
end

gemfile(true) do
  source 'https://rubygems.org'
  gem 'rails', '5.1.4'
  gem 'cancancan'
end

require 'cancancan'
require 'minitest/autorun'
require 'logger'

class Option
  include Singleton
  def self.all
    [X.instance, Y.instance, Any.instance ]
  end
end
class X   < Option; end
class Y   < Option; end
class Any < Option
  def to_a
    [X.instance, Y.instance]
  end
end

class Ability
  include CanCan::Ability

  def initialize
    Option.all.each do |option|
      can :read, option
      # Workaround:
      # can :read, [option]
    end
  end
end

class BugTest < Minitest::Test
  def test_bug
    ability = Ability.new
    #[X.instance, Y.instance].each do |option|
    Option.all.each do |option|
      assert_equal true, ability.can?(:read, option)
    end
  end
end