normalize-phone-number.rb

require 'fis/test'

class Phone

  def initialize(number)
    @number = number.gsub(/\D/, '')
    if @number.length == 11 && @number[0] == "1"
      @number = @number[1..10]
    end
  end

  def number
    @number.length == 10 ? @number : "0000000000"
  end

  def area_code
    @number[0..2]
  end

  def to_s
    @number = "(#{number[0..2]}) #{number[3..5]}-#{number[6..10]}"
  end

end

class Problems
  extend Fis::Test
 
  test 'cleans_number' do
    number = Phone.new("(123) 456-7890").number
    assert_equal "1234567890", number
  end
   
  test 'cleans_number_with_dots' do
    number = Phone.new("123.456.7890").number
    assert_equal "1234567890", number
  end

  test 'valid_when_11_digits_and_first_is_1' do
    number = Phone.new("11234567890").number
    assert_equal "1234567890", number
  end
   
  test 'invalid_when_11_digits' do
    number = Phone.new("21234567890").number
    assert_equal "0000000000", number
  end
   
  test 'invalid_when_9_digits' do
    number = Phone.new("123456789").number
    assert_equal "0000000000", number
  end
   
  test 'area_code' do
    number = Phone.new("1234567890")
    assert_equal "123", number.area_code
  end
   
  test 'pretty_print' do
    number = Phone.new("1234567890")
    assert_equal "(123) 456-7890", number.to_s
  end

end