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# -*- coding: utf-8 -*- |
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# Copyright 2014-2018 by Christopher C. Little. |
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# This file is part of Abydos. |
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# |
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# Abydos is free software: you can redistribute it and/or modify |
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# it under the terms of the GNU General Public License as published by |
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# the Free Software Foundation, either version 3 of the License, or |
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# (at your option) any later version. |
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# |
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# Abydos is distributed in the hope that it will be useful, |
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# but WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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# GNU General Public License for more details. |
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# |
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# You should have received a copy of the GNU General Public License |
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# along with Abydos. If not, see <http://www.gnu.org/licenses/>. |
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"""abydos.tests.test_distance.compression. |
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This module contains unit tests for abydos.distance.compression |
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""" |
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from __future__ import division, unicode_literals |
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import pkgutil |
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import sys |
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import unittest |
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from abydos.compression import arithmetic |
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from abydos.distance.compression import dist_ncd_arith, dist_ncd_bwtrle, \ |
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dist_ncd_bz2, dist_ncd_lzma, dist_ncd_rle, dist_ncd_zlib, sim_ncd_arith, \ |
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sim_ncd_bwtrle, sim_ncd_bz2, sim_ncd_lzma, sim_ncd_rle, sim_ncd_zlib |
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from .. import NIALL |
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class CompressionTestCases(unittest.TestCase): |
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"""Test compression distance functions. |
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abydos.distance.compression.dist_ncd_arith, .dist_ncd_bwtrle, |
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.dist_ncd_bz2, .dist_ncd_lzma, .dist_ncd_rle, .dist_ncd_zlib, |
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.sim_ncd_arith, .sim_ncd_bwtrle, .sim_ncd_bz2, .sim_ncd_lzma, .sim_ncd_rle, |
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& .sim_ncd_zlib |
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""" |
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arith_dict = arithmetic.train(' '.join(NIALL)) |
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def test_dist_ncd_bz2(self): |
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"""Test abydos.distance.compression.dist_ncd_bz2.""" |
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self.assertEqual(dist_ncd_bz2('', ''), 0) |
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self.assertGreater(dist_ncd_bz2('a', ''), 0) |
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self.assertGreater(dist_ncd_bz2('abcdefg', 'fg'), 0) |
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def test_dist_ncd_zlib(self): |
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"""Test abydos.distance.compression.dist_ncd_zlib.""" |
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self.assertEqual(dist_ncd_zlib('', ''), 0) |
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self.assertGreater(dist_ncd_zlib('a', ''), 0) |
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self.assertGreater(dist_ncd_zlib('abcdefg', 'fg'), 0) |
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def test_dist_ncd_arith(self): |
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"""Test abydos.distance.compression.dist_ncd_arith.""" |
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self.assertEqual(dist_ncd_arith('', ''), 0) |
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self.assertEqual(dist_ncd_arith('', '', self.arith_dict), 0) |
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self.assertGreater(dist_ncd_arith('a', ''), 0) |
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self.assertGreater(dist_ncd_arith('a', '', self.arith_dict), 0) |
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self.assertGreater(dist_ncd_arith('abcdefg', 'fg'), 0) |
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self.assertAlmostEqual(dist_ncd_arith('Niall', 'Neil', |
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self.arith_dict), |
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0.608695652173913) |
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self.assertAlmostEqual(dist_ncd_arith('Neil', 'Niall', |
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self.arith_dict), |
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0.608695652173913) |
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self.assertAlmostEqual(dist_ncd_arith('Niall', 'Neil'), |
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0.6875) |
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self.assertAlmostEqual(dist_ncd_arith('Neil', 'Niall'), |
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0.6875) |
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self.assertAlmostEqual(dist_ncd_arith('Njáll', 'Njall', |
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self.arith_dict), |
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0.714285714285714) |
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self.assertAlmostEqual(dist_ncd_arith('Njall', 'Njáll', |
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self.arith_dict), |
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0.714285714285714) |
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self.assertAlmostEqual(dist_ncd_arith('Njáll', 'Njall'), 0.75) |
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self.assertAlmostEqual(dist_ncd_arith('Njall', 'Njáll'), 0.75) |
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def test_dist_ncd_bwtrle(self): |
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"""Test abydos.distance..compression.dist_ncd_bwtrle.""" |
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self.assertEqual(dist_ncd_bwtrle('', ''), 0) |
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self.assertGreater(dist_ncd_bwtrle('a', ''), 0) |
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self.assertGreater(dist_ncd_bwtrle('abcdefg', 'fg'), 0) |
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self.assertAlmostEqual(dist_ncd_bwtrle('abc', 'abc'), 0) |
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self.assertAlmostEqual(dist_ncd_bwtrle('abc', 'def'), 0.75) |
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self.assertAlmostEqual(dist_ncd_bwtrle('banana', 'banane'), |
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0.57142857142) |
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self.assertAlmostEqual(dist_ncd_bwtrle('bananas', 'bananen'), 0.5) |
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def test_dist_ncd_rle(self): |
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"""Test abydos.distance..compression.dist_ncd_rle.""" |
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self.assertEqual(dist_ncd_rle('', ''), 0) |
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self.assertGreater(dist_ncd_rle('a', ''), 0) |
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self.assertGreater(dist_ncd_rle('abcdefg', 'fg'), 0) |
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self.assertAlmostEqual(dist_ncd_rle('abc', 'abc'), 0) |
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self.assertAlmostEqual(dist_ncd_rle('abc', 'def'), 1) |
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self.assertAlmostEqual(dist_ncd_rle('aaa', 'bbaaa'), 0.5) |
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self.assertAlmostEqual(dist_ncd_rle('abb', 'bbba'), 1/3) |
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def test_sim_ncd_bz2(self): |
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"""Test abydos.distance.compression.sim_ncd_bz2.""" |
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self.assertEqual(sim_ncd_bz2('', ''), 1) |
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self.assertLess(sim_ncd_bz2('a', ''), 1) |
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self.assertLess(sim_ncd_bz2('abcdefg', 'fg'), 1) |
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def test_sim_ncd_zlib(self): |
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"""Test abydos.distance.compression.sim_ncd_zlib.""" |
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self.assertEqual(sim_ncd_zlib('', ''), 1) |
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self.assertLess(sim_ncd_zlib('a', ''), 1) |
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self.assertLess(sim_ncd_zlib('abcdefg', 'fg'), 1) |
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def test_sim_ncd_arith(self): |
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"""Test abydos.distance.compression.sim_ncd_arith.""" |
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self.assertEqual(sim_ncd_arith('', ''), 1) |
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self.assertEqual(sim_ncd_arith('', '', self.arith_dict), 1) |
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self.assertLess(sim_ncd_arith('a', ''), 1) |
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self.assertLess(sim_ncd_arith('a', '', self.arith_dict), 1) |
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self.assertLess(sim_ncd_arith('abcdefg', 'fg'), 1) |
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self.assertAlmostEqual(sim_ncd_arith('Niall', 'Neil', self.arith_dict), |
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0.3913043478260869) |
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self.assertAlmostEqual(sim_ncd_arith('Neil', 'Niall', self.arith_dict), |
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0.3913043478260869) |
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self.assertAlmostEqual(sim_ncd_arith('Niall', 'Neil'), 0.3125) |
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self.assertAlmostEqual(sim_ncd_arith('Neil', 'Niall'), 0.3125) |
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self.assertAlmostEqual(sim_ncd_arith('Njáll', 'Njall', |
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self.arith_dict), |
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0.285714285714285) |
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self.assertAlmostEqual(sim_ncd_arith('Njall', 'Njáll', |
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self.arith_dict), |
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0.285714285714285) |
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self.assertAlmostEqual(sim_ncd_arith('Njáll', 'Njall'), 0.25) |
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self.assertAlmostEqual(sim_ncd_arith('Njall', 'Njáll'), 0.25) |
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def test_sim_ncd_rle(self): |
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"""Test abydos.distance.sim_ncd_rle.""" |
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self.assertEqual(sim_ncd_rle('', ''), 1) |
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self.assertLess(sim_ncd_rle('a', ''), 1) |
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self.assertLess(sim_ncd_rle('abcdefg', 'fg'), 1) |
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self.assertAlmostEqual(sim_ncd_rle('abc', 'abc'), 1) |
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self.assertAlmostEqual(sim_ncd_rle('abc', 'def'), 0) |
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self.assertAlmostEqual(sim_ncd_rle('aaa', 'bbaaa'), 0.5) |
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self.assertAlmostEqual(sim_ncd_rle('abb', 'bbba'), 2/3) |
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def test_sim_ncd_bwtrle(self): |
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"""Test abydos.distance.sim_ncd_bwtrle.""" |
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self.assertEqual(sim_ncd_bwtrle('', ''), 1) |
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self.assertLess(sim_ncd_bwtrle('a', ''), 1) |
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self.assertLess(sim_ncd_bwtrle('abcdefg', 'fg'), 1) |
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self.assertAlmostEqual(sim_ncd_bwtrle('abc', 'abc'), 1) |
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self.assertAlmostEqual(sim_ncd_bwtrle('abc', 'def'), 0.25) |
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self.assertAlmostEqual(sim_ncd_bwtrle('banana', 'banane'), |
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0.42857142857) |
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self.assertAlmostEqual(sim_ncd_bwtrle('bananas', 'bananen'), 0.5) |
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def test_sim_ncd_lzma(self): |
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"""Test abydos.distance.compression.dist_ncd_lzma & .sim_ncd_lzma.""" |
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if bool(pkgutil.find_loader('lzma')): |
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self.assertEqual(sim_ncd_lzma('', ''), 1) |
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self.assertLess(sim_ncd_lzma('a', ''), 1) |
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self.assertLess(sim_ncd_lzma('abcdefg', 'fg'), 1) |
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self.assertEqual(dist_ncd_lzma('', ''), 0) |
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self.assertGreater(dist_ncd_lzma('a', ''), 0) |
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self.assertGreater(dist_ncd_lzma('abcdefg', 'fg'), 0) |
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del sys.modules['lzma'] |
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self.assertRaises(ValueError, sim_ncd_lzma, 'a', '') |
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if __name__ == '__main__': |
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unittest.main() |
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chrislit /
abydos
