# Copyright (c) 2007 Samuel Tesla

# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:

# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

require 'test/unit'
require 'base32'

class TestBase32 < Test::Unit::TestCase
  def assert_decoding(encoded, plain)
    assert_equal(plain, Base32.decode(encoded))
  end

  def assert_encoding(encoded, plain)
    assert_equal(encoded, Base32.encode(plain))
  end

  def assert_encode_and_decode(encoded, plain)
    assert_encoding(encoded, plain)
    assert_decoding(encoded, plain)
  end

  def test_empty_string
    assert_encode_and_decode('', '')
  end

  def test_a
    assert_encode_and_decode('ME======', 'a')
  end

  def test_12345
    assert_encode_and_decode('GEZDGNBV', '12345')
  end

  def test_abcde
    assert_encode_and_decode('MFRGGZDF', 'abcde')
  end

  def test_constitution_preamble
    plaintext =<<-EOT
      We the people of the United States, in order to form a more perfect union,
      establish justice, insure domestic tranquility, provide for the common
      defense, promote the general welfare, and secure the blessings of liberty
      to ourselves and our posterity, do ordain and establish this Constitution
      for the United States of America.
    EOT
    encoded = %W(
      EAQCAIBAEBLWKIDUNBSSA4DFN5YGYZJAN5TCA5DIMUQFK3TJORSWIICTORQXIZLTFQQGS3RA
      N5ZGIZLSEB2G6IDGN5ZG2IDBEBWW64TFEBYGK4TGMVRXIIDVNZUW63RMBIQCAIBAEAQGK43U
      MFRGY2LTNAQGU5LTORUWGZJMEBUW443VOJSSAZDPNVSXG5DJMMQHI4TBNZYXK2LMNF2HSLBA
      OBZG65TJMRSSAZTPOIQHI2DFEBRW63LNN5XAUIBAEAQCAIDEMVTGK3TTMUWCA4DSN5WW65DF
      EB2GQZJAM5SW4ZLSMFWCA53FNRTGC4TFFQQGC3TEEBZWKY3VOJSSA5DIMUQGE3DFONZWS3TH
      OMQG6ZRANRUWEZLSOR4QUIBAEAQCAIDUN4QG65LSONSWY5TFOMQGC3TEEBXXK4RAOBXXG5DF
      OJUXI6JMEBSG6IDPOJSGC2LOEBQW4ZBAMVZXIYLCNRUXG2BAORUGS4ZAINXW443UNF2HK5DJ
      N5XAUIBAEAQCAIDGN5ZCA5DIMUQFK3TJORSWIICTORQXIZLTEBXWMICBNVSXE2LDMEXAU===).join
    assert_encode_and_decode(encoded, plaintext)
  end
end