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| 1 #!/usr/bin/env python |
| 2 # Copyright (c) 2016 The WebRTC project authors. All Rights Reserved. |
| 3 # |
| 4 # Use of this source code is governed by a BSD-style license |
| 5 # that can be found in the LICENSE file in the root of the source |
| 6 # tree. An additional intellectual property rights grant can be found |
| 7 # in the file PATENTS. All contributing project authors may |
| 8 # be found in the AUTHORS file in the root of the source tree. |
| 9 |
| 10 """Run the tests with |
| 11 |
| 12 python misc_test.py |
| 13 or |
| 14 python3 misc_test.py |
| 15 """ |
| 16 |
| 17 from __future__ import division |
| 18 import random |
| 19 import unittest |
| 20 |
| 21 import misc |
| 22 |
| 23 |
| 24 class TestMisc(unittest.TestCase): |
| 25 |
| 26 def testUnwrapMod3(self): |
| 27 data = [0, 1, 2, 0, -1, -2, -3, -4] |
| 28 unwrapped_3 = misc.unwrap(data, 3) |
| 29 self.assertEqual([0, 1, 2, 3, 2, 1, 0, -1], unwrapped_3) |
| 30 |
| 31 def testUnwrapMod4(self): |
| 32 data = [0, 1, 2, 0, -1, -2, -3, -4] |
| 33 unwrapped_4 = misc.unwrap(data, 4) |
| 34 self.assertEqual([0, 1, 2, 0, -1, -2, -3, -4], unwrapped_4) |
| 35 |
| 36 def testDataShouldNotChangeAfterUnwrap(self): |
| 37 data = [0, 1, 2, 0, -1, -2, -3, -4] |
| 38 _ = misc.unwrap(data, 4) |
| 39 |
| 40 self.assertEqual([0, 1, 2, 0, -1, -2, -3, -4], data) |
| 41 |
| 42 def testRandomlyMultiplesOfModAdded(self): |
| 43 # `unwrap` definition says only multiples of mod are added. |
| 44 random_data = [random.randint(0, 9) for _ in range(100)] |
| 45 |
| 46 for mod in range(1, 100): |
| 47 random_data_unwrapped_mod = misc.unwrap(random_data, mod) |
| 48 |
| 49 for (old_a, a) in zip(random_data, random_data_unwrapped_mod): |
| 50 self.assertEqual((old_a - a) % mod, 0) |
| 51 |
| 52 def testRandomlyAgainstInequalityDefinition(self): |
| 53 # Data has to satisfy -mod/2 <= difference < mod/2 for every |
| 54 # difference between consecutive values after unwrap. |
| 55 random_data = [random.randint(0, 9) for _ in range(100)] |
| 56 |
| 57 for mod in range(1, 100): |
| 58 random_data_unwrapped_mod = misc.unwrap(random_data, mod) |
| 59 |
| 60 for (a, b) in zip(random_data_unwrapped_mod, |
| 61 random_data_unwrapped_mod[1:]): |
| 62 self.assertTrue(-mod / 2 <= b - a < mod / 2) |
| 63 |
| 64 def testRandomlyDataShouldNotChangeAfterUnwrap(self): |
| 65 random_data = [random.randint(0, 9) for _ in range(100)] |
| 66 random_data_copy = random_data[:] |
| 67 for mod in range(1, 100): |
| 68 _ = misc.unwrap(random_data, mod) |
| 69 |
| 70 self.assertEqual(random_data, random_data_copy) |
| 71 |
| 72 if __name__ == "__main__": |
| 73 unittest.main() |
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