# Copyright 2016  Lars Wirzenius
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# =*= License: GPL-3+ =*=


import unittest

import pgpwordlist


class WordListQueriesTests(unittest.TestCase):

    def test_raises_keyerror_if_hex_value_unknown(self):
        with self.assertRaises(KeyError):
            pgpwordlist.get_word('g', 0)

    def test_gets_unique_results_for_all_two_hex_digit_velues(self):
        even_words = set()
        odd_words = set()
        for i in range(256):
            hex = '%02x' % i
            even_word = pgpwordlist.get_word(hex, 0)
            odd_word = pgpwordlist.get_word(hex, 1)
            self.assertNotIn(even_word, even_words)
            self.assertNotIn(odd_word, odd_words)
            even_words.add(even_word)
            odd_words.add(odd_word)

    def test_round_trip_works(self):
        for i in range(256):
            hex = '%02x' % i
            even_word = pgpwordlist.get_word(hex, 0)
            odd_word = pgpwordlist.get_word(hex, 1)
            self.assertEqual(pgpwordlist.get_hex(even_word), hex)
            self.assertEqual(pgpwordlist.get_hex(odd_word), hex)


class WordStringTests(unittest.TestCase):

    def test_roundtrip_works(self):
        hex = 'cafef00d'
        words = pgpwordlist.hex_to_words(hex)
        self.assertEqual(pgpwordlist.words_to_hex(words), hex)