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#!/usr/bin/env python3
# Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
#
# Use of this source code is governed by a BSD-style license
# that can be found in the LICENSE file in the root of the source
# tree. An additional intellectual property rights grant can be found
# in the file PATENTS. All contributing project authors may
# be found in the AUTHORS file in the root of the source tree.
"""Run the tests with
python misc_test.py
or
python3 misc_test.py
"""
from __future__ import division
from __future__ import absolute_import
import random
import unittest
from six.moves import range
from six.moves import zip
import misc
class TestMisc(unittest.TestCase):
def testUnwrapMod3(self):
data = [0, 1, 2, 0, -1, -2, -3, -4]
unwrapped_3 = misc.Unwrap(data, 3)
self.assertEqual([0, 1, 2, 3, 2, 1, 0, -1], unwrapped_3)
def testUnwrapMod4(self):
data = [0, 1, 2, 0, -1, -2, -3, -4]
unwrapped_4 = misc.Unwrap(data, 4)
self.assertEqual([0, 1, 2, 0, -1, -2, -3, -4], unwrapped_4)
def testDataShouldNotChangeAfterUnwrap(self):
data = [0, 1, 2, 0, -1, -2, -3, -4]
_ = misc.Unwrap(data, 4)
self.assertEqual([0, 1, 2, 0, -1, -2, -3, -4], data)
def testRandomlyMultiplesOfModAdded(self):
# `unwrap` definition says only multiples of mod are added.
random_data = [random.randint(0, 9) for _ in range(100)]
for mod in range(1, 100):
random_data_unwrapped_mod = misc.Unwrap(random_data, mod)
for (old_a, a) in zip(random_data, random_data_unwrapped_mod):
self.assertEqual((old_a - a) % mod, 0)
def testRandomlyAgainstInequalityDefinition(self):
# Data has to satisfy -mod/2 <= difference < mod/2 for every
# difference between consecutive values after unwrap.
random_data = [random.randint(0, 9) for _ in range(100)]
for mod in range(1, 100):
random_data_unwrapped_mod = misc.Unwrap(random_data, mod)
for (a, b) in zip(random_data_unwrapped_mod,
random_data_unwrapped_mod[1:]):
self.assertTrue(-mod / 2 <= b - a < mod / 2)
def testRandomlyDataShouldNotChangeAfterUnwrap(self):
random_data = [random.randint(0, 9) for _ in range(100)]
random_data_copy = random_data[:]
for mod in range(1, 100):
_ = misc.Unwrap(random_data, mod)
self.assertEqual(random_data, random_data_copy)
if __name__ == "__main__":
unittest.main()
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