#!/usr/bin/ruby

class Monster
  attr_reader :species, :uid

  @@find_uid = Hash.new(nil);

  def initialize(species, uid)
    @species = species
    @uid = uid
    @@find_uid[@uid] = self
  end

  def Monster.find_by_uid(uid)
    return @@find_uid[uid]
  end
end

if __FILE__ == $0
  require "../utils/assert.rb"

  grid_bug = Monster.new("grid bug", "foo")
  assert_eq("assigning a uid", grid_bug.uid, "foo")

  snake = Monster.new("snake", "bar")
  assert_eq("assigning another uid", snake.uid, "bar")
  assert_eq("second object affects first object", grid_bug.uid, "foo")

  find_snake = Monster.find_by_uid("bar")
  assert_eq("finding a monster by uid", find_snake.species, snake.species)

  find_fail = Monster.find_by_uid("quux")
  assert_eq("finding a monster with a bogus uid", find_fail, nil)

  print "unit test succeeded\n"

end