Bottles of Beer on the Wall

bottles/lib/bottles.rb

@@ -1,2 +1,39 @@
 class Bottles
+  def verse(n)
+    "#{prefix(n)}\n#{suffix(n)}\n"
+  end
+
+  def prefix(n)
+    if n > 0
+      "#{numberBottles(n)} of beer on the wall, #{numberBottles(n)} of beer."
+    else
+      "No more bottles of beer on the wall, no more bottles of beer."
+    end
+  end
+
+  def suffix(n)
+    if n == 0
+      "Go to the store and buy some more, 99 bottles of beer on the wall."
+    elsif n == 1
+      "Take it down and pass it around, no more bottles of beer on the wall."
+    else
+      "Take one down and pass it around, #{numberBottles(n - 1)} of beer on the wall."
+    end
+  end
+
+  def verses(start, finish)
+    start.downto(finish).map { |n| verse(n) }.join("\n") << "\n"
+  end
+
+  def numberBottles(n)
+    if n == 1
+      "#{n} bottle"
+    else
+      "#{n} bottles"
+    end
+  end
+
+  def sing
+    verses(99, 0)
+  end
 end

bottles/spec/bottles_spec.rb

@@ -10,37 +10,31 @@
   end
 
   it "can sing another typical verse" do
-    skip
     expected = "3 bottles of beer on the wall, 3 bottles of beer.\nTake one down and pass it around, 2 bottles of beer on the wall.\n"
     expect( song.verse(3) ).to eq( expected )
   end
 
   it "can sing about 1 bottle" do
-    skip
     expected = "1 bottle of beer on the wall, 1 bottle of beer.\nTake it down and pass it around, no more bottles of beer on the wall.\n"
     expect( song.verse(1) ).to eq( expected )
   end
 
   it "can sing about 2 bottles" do
-    skip
     expected = "2 bottles of beer on the wall, 2 bottles of beer.\nTake one down and pass it around, 1 bottle of beer on the wall.\n"
     expect( song.verse(2) ).to eq( expected )
   end
 
   it "can sing about no more bottles" do
-    skip
     expected = "No more bottles of beer on the wall, no more bottles of beer.\nGo to the store and buy some more, 99 bottles of beer on the wall.\n"
     expect( song.verse(0) ).to eq( expected )
   end
 
   it "can string a few verses together" do
-    skip
     expected = "8 bottles of beer on the wall, 8 bottles of beer.\nTake one down and pass it around, 7 bottles of beer on the wall.\n\n7 bottles of beer on the wall, 7 bottles of beer.\nTake one down and pass it around, 6 bottles of beer on the wall.\n\n6 bottles of beer on the wall, 6 bottles of beer.\nTake one down and pass it around, 5 bottles of beer on the wall.\n\n"
     expect( song.verses(8, 6) ).to eq( expected )
   end
 
   it "can sing the whole song" do
-    skip
     expect( song.sing ).to eq( song.verses(99, 0) )
   end
 end