From: Matthew Moss <matthew.moss.coder@...>
Date: 2007-04-28T04:31:37+09:00
Subject: Re: [QUIZ] Checking Credit Cards (#122)

So I took this as an opportunity to try doing a little TDD, something
which is appealing but I've never really tried.  It _is_ fun to see
failure first and then fix.  =)  There are probably other tests I
could have included, but here is a start, in case people want to check
a few numbers or add more tests:

Obviously, you may need to change this to match your solution...


require "test/unit"
require "ccard"


class CreditCardCheckTest < Test::Unit::TestCase

   def test_valid_numbers
      assert CreditCard.new("4408041234567893").valid?
      assert CreditCard.new("6011111111111117").valid?
   end

   def test_invalid_nubers
      assert !CreditCard.new("4417123456789112").valid?
   end


   def test_valid_numbers_with_spaces
      assert CreditCard.new("4408 0412 3456 7893").valid?
      assert CreditCard.new("6011 1111 1111 1117").valid?
   end

   def test_invalid_nubers_with_spaces
      assert !CreditCard.new("4417 1234 5678 9112").valid?
   end

   def test_valid_types
      assert_equal CreditCard.new("4408041234567893").type,    :visa
      assert_equal CreditCard.new("4408 0412 3456 7893").type, :visa
      assert_equal CreditCard.new("6011 1111 1111 1117").type, :discover
      assert_equal CreditCard.new("123456789").type,           :unknown
   end

   def test_invalid_types
      assert_nil CreditCard.new("4408 0412 3456 789").type
   end

end