End of exercise

beer_song.rb

@@ -0,0 +1,27 @@
+class String
+  def pluralize(count)
+    string = self.to_s
+    word = (count > 1 || count == 0) ? "#{string}s" : string
+    count = "no more" if count == 0
+    "#{count} #{word}"
+  end
+end
+
+class BeerSong
+
+  def verse(line_number)
+    current_verse = Verse.new(line_number)
+    current_verse.first_sentence << current_verse.second_sentence
+  end
+
+  def verses(a, b)
+    (b..a).map do |index|
+      verse(index)
+    end.reverse.join("\n")
+  end
+
+  def lyrics
+    verses(99, 0)
+  end
+
+end

beer_song_test.rb

@@ -2,6 +2,8 @@
 gem 'minitest', '>= 5.0.0'
 require 'minitest/autorun'
 require_relative 'beer_song'
+require_relative 'book_keeping'
+require_relative 'verse'
 
 # rubocop:disable Metrics/LineLength
 class BeerSongTest < Minitest::Test
@@ -12,35 +14,30 @@ def test_the_first_verse
   end
 
   def test_another_verse
-    skip
     expected = "3 bottles of beer on the wall, 3 bottles of beer.\n" \
       "Take one down and pass it around, 2 bottles of beer on the wall.\n"
     assert_equal expected, BeerSong.new.verse(3)
   end
 
   def test_verse_2
-    skip
     expected = "2 bottles of beer on the wall, 2 bottles of beer.\n" \
       "Take one down and pass it around, 1 bottle of beer on the wall.\n"
     assert_equal expected, BeerSong.new.verse(2)
   end
 
   def test_verse_1
-    skip
     expected = "1 bottle of beer on the wall, 1 bottle of beer.\n" \
       "Take it down and pass it around, no more bottles of beer on the wall.\n"
     assert_equal expected, BeerSong.new.verse(1)
   end
 
   def test_verse_0
-    skip
     expected = "No more bottles of beer on the wall, no more bottles of beer.\n" \
       "Go to the store and buy some more, 99 bottles of beer on the wall.\n"
     assert_equal expected, BeerSong.new.verse(0)
   end
 
   def test_a_couple_verses
-    skip
     expected = "99 bottles of beer on the wall, 99 bottles of beer.\n" \
       "Take one down and pass it around, 98 bottles of beer on the wall.\n" \
       "\n" \
@@ -50,7 +47,6 @@ def test_a_couple_verses
   end
 
   def test_a_few_verses
-    skip
     expected = "2 bottles of beer on the wall, 2 bottles of beer.\n" \
       "Take one down and pass it around, 1 bottle of beer on the wall.\n" \
       "\n" \
@@ -63,7 +59,6 @@ def test_a_few_verses
   end
 
   def test_the_whole_song # rubocop:disable Metrics/MethodLength
-    skip
     expected = <<-SONG
 99 bottles of beer on the wall, 99 bottles of beer.
 Take one down and pass it around, 98 bottles of beer on the wall.
@@ -375,7 +370,6 @@ def test_the_whole_song # rubocop:disable Metrics/MethodLength
   #
   # Define a constant named VERSION inside of BookKeeping.
   def test_bookkeeping
-    skip
     assert_equal 2, BookKeeping::VERSION
   end
 end

book_keeping.rb

@@ -0,0 +1,3 @@
+class BookKeeping
+  VERSION = 2.freeze
+end

verse.rb

@@ -0,0 +1,21 @@
+class Verse
+  def initialize(line_number)
+    @line_number = line_number
+  end
+  attr_reader :line_number
+
+  def first_sentence
+    first_word      = "bottle".pluralize(line_number)
+    first_word = first_word.capitalize if line_number == 0
+    "#{first_word} of beer on the wall, #{"bottle".pluralize(line_number)} of beer.\n" \
+  end
+
+  def second_sentence
+    if line_number == 0
+      "Go to the store and buy some more, 99 bottles of beer on the wall.\n"
+    else
+      one_word        = line_number == 1 ? "it" : "one"
+      "Take #{one_word} down and pass it around, #{"bottle".pluralize(line_number - 1)} of beer on the wall.\n"
+    end
+  end
+end