Offline Credit Card Validator Specs

credit_card_validator_spec.rb

# Ruby Version: ruby-1.9.2-p290
# Author: Rahul Trikha
# Email: rahul.trikha@gmail.com
# Run: ruby credit_card_validator_spec.rb

# Include the latest version of minitest
# Must and won't predicates do not work with the
# shipped version of minitest with ruby
# Please install the latest minitest gem before running the specs
# $ gem install minitest -v=3.3.0
gem 'minitest'

require 'minitest/spec'
require 'minitest/autorun'

require_relative 'credit_card_validator'

describe CreditCardValidator do
  before do
    @validator = CreditCardValidator.new
  end

  describe "when asked about validity of a AMEX card" do
    it "should respond true for a valid card" do
      @validator.card = "378282246310005"
      @validator.must_be :valid?
    end

    it "should respond false for a invalid card" do
      @validator.card = "37828224631000"
      @validator.wont_be :valid?
    end
  end

  describe "when asked about validity of a Discover card" do
    it "should respond true for a valid card" do
      @validator.card = "6011111111111117"
      @validator.must_be :valid?
    end

    it "should respond false for a invalid card" do
      @validator.card = "601111111111111"
      @validator.wont_be :valid?
    end
  end

  describe "when asked about validity of a MasterCard card" do
    it "should respond true for a valid card" do
      @validator.card = "5105105105105100"
      @validator.must_be :valid?
    end

    it "should respond false for a invalid card" do
      @validator.card = "5105105105105106"
      @validator.wont_be :valid?
    end

    it "should respond false for a invalid card" do
      @validator.card = "510510510510510"
      @validator.wont_be :valid?
    end
  end

  describe "when asked about validity of a VISA card" do
    it "should respond true for a valid card" do
      @validator.card = "4111111111111111"
      @validator.must_be :valid?
    end

    it "should respond true for a valid card" do
      @validator.card = "4012888888881881"
      @validator.must_be :valid?
    end

    it "should respond false for a invalid card" do
      @validator.card = "4111111111111"
      @validator.wont_be :valid?
    end
  end

  describe "when asked about validity of a Unkown card" do
    it "should respond false for a invalid card" do
      @validator.card = "9111111111111111"
      @validator.wont_be :valid?
    end
  end
end