def fact(n)
    if n == 1
       1
    else 
       fact(n-1) * n
    end
 end
 
 if (fact(1) != 1)
   puts "Error when calling Factorial with 1"
elsif fact(2) != 2
   puts "Error when calling Factorial with 2"
else
   puts "Factorial function works."
end

 require 'minitest/autorun'
 
 def fact(n)
    if n == 1
       1
    else 
       fact(n-1) * n
    end
 end

describe "factorials" do
   it "works for 1" do
      fact(1).must_equal 1
   end

   it "works for 2" do
      fact(2).must_equal 2
   end

   it "works for 20" do
      fact(20).must_equal 2432902008176640000
   end

   it "works for zero" do
      fact(0).must_equal 0
   end
end

 require 'minitest/autorun'
 
 class PlayingCard
    attr_reader :rank, :suit
    def initialize suit:nil, rank:nil
       @suit = suit
       @rank = rank
    end
 
   def random
      @suit = ["hearts", "spades", "diamonds", "clubs"].sample
      @rank = rand(13)
      self
   end

   def to_s
      card_to_english
   end

   def card_to_engish
      rank_to_english + " of " + @suit
   end

   def valid?
      @rank >= 1 && @rank <= 13 && !@suit.nil?
   end

   private

   def rank_to_english
      if @rank == "1"
         "Ace"
      elsif @rank > 1 && @rank < 11
         number_to_english(@rank)
      elsif @rank == 11
         "Jack"
      elsif @rank == 12
         "Queen"
      elsif @rank == 13
         "King"
      end
   end

   def number_to_english val
      %w(fail0 fail1 two three four five six seven eight nine ten)[val]
   end
end

describe PlayingCard do
   before do
      @a_card = PlayingCard.new.random
   end

   it "creates a valid card" do
      @a_card.valid?.must_equal true
   end
   
end