Mercurial > hgrepos > Python > apps > py-cutils

annotate tests/test_crc32.py @ 357:7f797d71bd5e

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Add SPDX license tags to unittest scripts
author Franz Glasner <fzglas.hg@dom66.de>
date Wed, 02 Apr 2025 14:05:03 +0200
parents 1181d8cb4846
children
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1 # -*- coding: utf-8 -*-
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2 # :-
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3 # SPDX-FileCopyrightText: © 2025 Franz Glasner
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4 # SPDX-License-Identifier: BSD-3-Clause
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5 # :-
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6 r"""Unit tests for the vendored crcmod2 package.
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7
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8 """
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9
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10 from __future__ import absolute_import, print_function
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11
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12 import struct
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13 import sys
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14 import unittest
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15 import zlib
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16
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17 import _test_setup # noqa: F401 imported but unused
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18
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19 import cutils.util.crc32
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20
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21
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22 class TestCRC32(unittest.TestCase):
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23
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24 def test_empty(self):
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25 c1 = cutils.util.crc32.crc32()
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26 c2 = zlib.crc32(b"")
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27 self.assertEqual(c1._crc, c2)
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28 self.assertEqual("00000000", c1.hexdigest())
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29 self.assertEqual(b"\x00\x00\x00\x00", c1.digest())
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30
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31 def test_uint32(self):
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32 c1 = cutils.util.crc32.crc32()
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33 c1._crc = 0xffffffff
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34 self.assertEqual("FFFFFFFF", c1.hexdigest())
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35 self.assertEqual(b"\xff\xff\xff\xff", c1.digest())
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36
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37 @unittest.skipIf(sys.version_info[0] >= 3, "Only for Python 2")
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38 def test_negative_minus_one(self):
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39 # Python2 yields negative numbers in zlib.crc32()
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40 c1 = cutils.util.crc32.crc32()
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41 c1._crc = -1
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42 self.assertEqual("FFFFFFFF", c1.hexdigest())
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43 self.assertEqual(b"\xff\xff\xff\xff", c1.digest())
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44
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45 def test_postitive_asd(self):
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46 c1 = cutils.util.crc32.crc32(b"asd\n")
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47 c2 = zlib.crc32(b"")
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48 c2 = zlib.crc32(b"asd\n", c2)
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49 self.assertEqual(c1._crc, c2)
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50 self.assertEqual(355327694, c1._crc)
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51 self.assertEqual("152DDECE", c1.hexdigest())
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52 self.assertEqual(b"\x15\x2d\xde\xce", c1.digest())
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53
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54 def test_negative_123456789(self):
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55 c1 = cutils.util.crc32.crc32()
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56 c1.update(b"123456789")
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57 c2 = zlib.crc32(b"123456789")
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58 self.assertEqual(c1._crc, c2)
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59 self.assertEqual("CBF43926", c1.hexdigest())
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60 self.assertEqual(b"\xcb\xf4\x39\x26", c1.digest())
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61
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62 def test_copy(self):
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63 c1 = cutils.util.crc32.crc32(b"123456789")
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64 c2 = c1.copy()
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65 self.assertEqual(c1._crc, c2._crc)
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66 self.assertEqual("CBF43926", c2.hexdigest())
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67
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68 def test_copy_parts(self):
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69 c1 = cutils.util.crc32.crc32(b"12345")
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70 c2 = c1.copy()
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71 c2.update(b"6789")
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72 self.assertEqual("CBF43926", c2.hexdigest())
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73
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74 def test_equality(self):
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75 c1 = cutils.util.crc32.crc32(b"123")
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76 c2 = c1.copy()
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77 c3 = zlib.crc32(b"123")
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78 self.assertEqual(c2, c1)
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79 self.assertEqual(c1, c2._crc)
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80 self.assertEqual(c1, c3)
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81 self.assertNotEqual(c1, None)
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82
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83 def test_equality_2(self):
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84 c1 = cutils.util.crc32.crc32(b"123456789")
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85 c2 = c1.copy()
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86 c3 = zlib.crc32(b"123456789")
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87 self.assertEqual(c2, c1)
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88 self.assertEqual(c1, c2._crc)
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89 self.assertEqual(c1, c3)
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90 self.assertNotEqual(c1, None)
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91
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92 def test_inequality(self):
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93 c1 = cutils.util.crc32.crc32(b"123")
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94 c2 = c1.copy()
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95 c1.update(b"4")
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96 c3 = zlib.crc32(b"12345")
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97 self.assertNotEqual(c2, c1)
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98 self.assertNotEqual(c1, c2._crc)
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99 self.assertNotEqual(c1, c3)
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100 self.assertNotEqual(c1, None)
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101
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102 def test_inequality_2(self):
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103 c1 = cutils.util.crc32.crc32(b"12345678")
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104 c2 = c1.copy()
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105 c2.update(b"9")
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106 c3 = zlib.crc32(b"1234567")
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107 self.assertNotEqual(c2, c1)
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108 self.assertNotEqual(c1, c2._crc)
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109 self.assertNotEqual(c1, c3)
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110 self.assertNotEqual(c1, None)
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111
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112 def test_equality_negative_number(self):
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113 c1 = cutils.util.crc32.crc32(b"123456789")
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114 # Py2 yields signed ints
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115 self.assertEqual(c1, -873187034)
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116 # Py3 yields unsigned ints
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117 self.assertEqual(c1, 3421780262)
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118
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119 def test_as_uint32(self):
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120 self.assertEqual(3421780262,
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121 cutils.util.crc32.crc32.as_uint32(-873187034))
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122
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123 def test_struct_pack(self):
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124 self.assertEqual(
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125 struct.pack(">I", 3421780262),
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126 struct.pack(">i", -873187034))
257
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127 self.assertEqual(
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128 struct.pack(">i", -2147483648),
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129 struct.pack(">I", 0x80000000))
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130
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131
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132 if __name__ == "__main__":
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133 unittest.main()