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@krashev
Created July 2, 2014 10:19
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B team
class Bottles
def song
verses(99, 0)
end
def verses(upper_bound, lower_bound)
upper_bound.downto(lower_bound).map { |i| verse(i) }.join("\n")
end
def verse(verse_number)
current_bn = create_bottles(verse_number)
next_bn = create_bottles(current_bn.next)
"#{current_bn.quantity.capitalize} #{current_bn.container} of beer on the wall, " +
"#{current_bn.quantity} #{current_bn.container} of beer.\n" +
"#{current_bn.action}, " +
"#{next_bn.quantity} #{next_bn.container} of beer on the wall.\n"
end
private
def create_bottles(number)
if number == 0
BottleNumber0.new(number)
elsif number == 1
BottleNumber1.new(number)
elsif number == 6
BottleNumber6.new(number)
else
BottleNumber.new(number)
end
end
end
class BottleNumber
attr_reader :number
def initialize(number)
@number = number
end
def container
'bottles'
end
def pronoun
'one'
end
def quantity
number.to_s
end
def action
"Take #{pronoun} down and pass it around"
end
def next
number - 1
end
end
class BottleNumber0 < BottleNumber
def quantity
'no more'
end
def action
"Go to the store and buy some more"
end
def next
99
end
end
class BottleNumber1 < BottleNumber
def pronoun
'it'
end
def container
'bottle'
end
end
class BottleNumber6 < BottleNumber
def quantity
"1"
end
def container
'six-pack'
end
end
gem 'minitest', '~> 5.3'
require 'minitest/autorun'
require 'minitest/pride'
require_relative '../lib/bottles'
class BottlesTest < Minitest::Test
attr_reader :bottles
def setup
@bottles = ::Bottles.new
end
def test_the_first_verse
expected = <<-VERSE
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.
VERSE
assert_equal expected, bottles.verse(99)
end
def test_another_verse
expected = <<-VERSE
89 bottles of beer on the wall, 89 bottles of beer.
Take one down and pass it around, 88 bottles of beer on the wall.
VERSE
assert_equal expected, bottles.verse(89)
end
def test_verse_2
expected = <<-VERSE
2 bottles of beer on the wall, 2 bottles of beer.
Take one down and pass it around, 1 bottle of beer on the wall.
VERSE
assert_equal expected, bottles.verse(2)
end
def test_verse_1
expected = <<-VERSE
1 bottle of beer on the wall, 1 bottle of beer.
Take it down and pass it around, no more bottles of beer on the wall.
VERSE
assert_equal expected, bottles.verse(1)
end
def test_verse_0
expected = <<-VERSE
No more bottles of beer on the wall, no more bottles of beer.
Go to the store and buy some more, 99 bottles of beer on the wall.
VERSE
assert_equal expected, bottles.verse(0)
end
def test_a_couple_verses
expected = <<-VERSES
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.
98 bottles of beer on the wall, 98 bottles of beer.
Take one down and pass it around, 97 bottles of beer on the wall.
VERSES
assert_equal expected, bottles.verses(99, 98)
end
def test_a_few_verses
expected = <<-VERSES
2 bottles of beer on the wall, 2 bottles of beer.
Take one down and pass it around, 1 bottle of beer on the wall.
1 bottle of beer on the wall, 1 bottle of beer.
Take it down and pass it around, no more bottles of beer on the wall.
No more bottles of beer on the wall, no more bottles of beer.
Go to the store and buy some more, 99 bottles of beer on the wall.
VERSES
assert_equal expected, bottles.verses(2, 0)
end
def test_the_whole_song
assert_equal bottles.verses(99, 0), bottles.song
end
def test_7
expected = <<-VERSE
7 bottles of beer on the wall, 7 bottles of beer.
Take one down and pass it around, 1 six-pack of beer on the wall.
VERSE
assert_equal expected, bottles.verse(7)
end
def test_6
expected = <<-VERSE
1 six-pack of beer on the wall, 1 six-pack of beer.
Take one down and pass it around, 5 bottles of beer on the wall.
VERSE
assert_equal expected, bottles.verse(6)
end
end
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