bitlib_test.rb

require 'minitest/autorun'

class Bitlib
  # Add Implementation Here
end

class Encryptor
  # Add Implementation Here
end

class BitlibTest < MiniTest::Unit::TestCase

  def test_converts_string_to_array_of_bits
    bits = [0, 1, 1, 0, 0, 1, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 0, 0, 1, 0, 0]
    assert_equal bits, Bitlib.bits_for('god')
  end

  def test_converts_bits_array_to_string
    bits = [0, 1, 1, 0, 0, 1, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 0, 0, 1, 0, 0]
    assert_equal 'god', Bitlib.string_for(bits)
  end

  def test_xor_two_equal_size_arrays
    bits1 = [0, 1, 1, 0]
    bits2 = [1, 1, 1, 1]
    assert_equal [1, 0, 0, 1], Bitlib.xor(bits1, bits2)
  end

end

class EncryptorTest < MiniTest::Unit::TestCase

  def test_encrypt_xors_equal_length_plaintext_and_key
    key = 'AX894DJC8FJKCV'
    plaintext = 'This is a test'
    ciphertext = "\x150QJ\x14-9cYf>.0\""
    encryptor = Encryptor.new
    assert_equal ciphertext, encryptor.encrypt(plaintext, key)
  end

  def test_encrypt_twice_with_same_key_decrypts
    key = 'AX894DJC8FJKCV'
    plaintext = 'This is a test'
    ciphertext = "\x150QJ\x14-9cYf>.0\""
    encryptor = Encryptor.new
    assert_equal plaintext, encryptor.encrypt(encryptor.encrypt(plaintext, key), key)
  end

end