Coin Change Machine

coins.rb

require 'test/unit'

class ChangeMachine
  
  # Returns an array indicating the quantity of 
  # each denomination required.
  # [pennies, nickels, dimes, quarters]
  def issue_coins(amount)
  end
end

class ChangeMachineTest < Test::Unit::TestCase
  
  def test_one_penny
    machine = ChangeMachine.new
    coins = machine.issue_coins(1)
    assert_equal [1, 0, 0, 0], coins
  end
  
  def test_pennies
    machine = ChangeMachine.new
    coins = machine.issue_coins(4)
    assert_equal [4, 0, 0, 0], coins
  end
  
  def test_nickels
    machine = ChangeMachine.new
    coins = machine.issue_coins(5)
    assert_equal [0, 1, 0, 0], coins
  end
  
  def test_nickels_and_pennies
    machine = ChangeMachine.new
    coins = machine.issue_coins(6)
    assert_equal [1, 1, 0, 0], coins
  end
  def test_dimes
    machine = ChangeMachine.new
    coins = machine.issue_coins(10)
    assert_equal [0, 0, 1, 0], coins
  end
  def test_dimes_and_nickels
    machine = ChangeMachine.new
    coins = machine.issue_coins(15)
    assert_equal [0, 1, 1, 0], coins
  end
  def test_quarters
    machine = ChangeMachine.new
    coins = machine.issue_coins(25)
    assert_equal [0, 0, 0, 1], coins
  end
  
  def test_quarters_and_dimes
    machine = ChangeMachine.new
    coins = machine.issue_coins(35)
    assert_equal [0, 0, 1, 1], coins
  end
  
  def test_99
    machine = ChangeMachine.new
    coins = machine.issue_coins(99)
    assert_equal [4, 0, 2, 3], coins
  end
end