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annotate tests/test_crc32.py @ 257:1181d8cb4846

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Tests: add a tests for the 32-bit border
author Franz Glasner <fzglas.hg@dom66.de>
date Sun, 16 Feb 2025 09:30:23 +0100
parents d852559df523
children 7f797d71bd5e
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255
d852559df523 Wrap zlib.crc32 into a hashlib-compatible interface
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1 # -*- coding: utf-8 -*-
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2 r"""Unit tests for the vendored crcmod2 package.
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3
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4 """
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5
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6 from __future__ import absolute_import, print_function
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7
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8 import struct
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9 import sys
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10 import unittest
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11 import zlib
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12
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13 import _test_setup # noqa: F401 imported but unused
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14
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15 import cutils.util.crc32
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16
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17
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18 class TestCRC32(unittest.TestCase):
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19
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20 def test_empty(self):
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21 c1 = cutils.util.crc32.crc32()
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22 c2 = zlib.crc32(b"")
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23 self.assertEqual(c1._crc, c2)
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24 self.assertEqual("00000000", c1.hexdigest())
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25 self.assertEqual(b"\x00\x00\x00\x00", c1.digest())
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26
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27 def test_uint32(self):
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28 c1 = cutils.util.crc32.crc32()
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29 c1._crc = 0xffffffff
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30 self.assertEqual("FFFFFFFF", c1.hexdigest())
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31 self.assertEqual(b"\xff\xff\xff\xff", c1.digest())
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32
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33 @unittest.skipIf(sys.version_info[0] >= 3, "Only for Python 2")
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34 def test_negative_minus_one(self):
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35 # Python2 yields negative numbers in zlib.crc32()
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36 c1 = cutils.util.crc32.crc32()
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37 c1._crc = -1
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38 self.assertEqual("FFFFFFFF", c1.hexdigest())
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39 self.assertEqual(b"\xff\xff\xff\xff", c1.digest())
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40
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41 def test_postitive_asd(self):
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42 c1 = cutils.util.crc32.crc32(b"asd\n")
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43 c2 = zlib.crc32(b"")
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44 c2 = zlib.crc32(b"asd\n", c2)
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45 self.assertEqual(c1._crc, c2)
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46 self.assertEqual(355327694, c1._crc)
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47 self.assertEqual("152DDECE", c1.hexdigest())
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48 self.assertEqual(b"\x15\x2d\xde\xce", c1.digest())
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49
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50 def test_negative_123456789(self):
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51 c1 = cutils.util.crc32.crc32()
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52 c1.update(b"123456789")
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53 c2 = zlib.crc32(b"123456789")
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54 self.assertEqual(c1._crc, c2)
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55 self.assertEqual("CBF43926", c1.hexdigest())
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56 self.assertEqual(b"\xcb\xf4\x39\x26", c1.digest())
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57
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58 def test_copy(self):
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59 c1 = cutils.util.crc32.crc32(b"123456789")
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60 c2 = c1.copy()
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61 self.assertEqual(c1._crc, c2._crc)
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62 self.assertEqual("CBF43926", c2.hexdigest())
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63
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64 def test_copy_parts(self):
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65 c1 = cutils.util.crc32.crc32(b"12345")
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66 c2 = c1.copy()
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67 c2.update(b"6789")
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68 self.assertEqual("CBF43926", c2.hexdigest())
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69
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70 def test_equality(self):
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71 c1 = cutils.util.crc32.crc32(b"123")
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72 c2 = c1.copy()
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73 c3 = zlib.crc32(b"123")
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74 self.assertEqual(c2, c1)
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75 self.assertEqual(c1, c2._crc)
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76 self.assertEqual(c1, c3)
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77 self.assertNotEqual(c1, None)
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78
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79 def test_equality_2(self):
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80 c1 = cutils.util.crc32.crc32(b"123456789")
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81 c2 = c1.copy()
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82 c3 = zlib.crc32(b"123456789")
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83 self.assertEqual(c2, c1)
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84 self.assertEqual(c1, c2._crc)
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85 self.assertEqual(c1, c3)
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86 self.assertNotEqual(c1, None)
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87
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88 def test_inequality(self):
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89 c1 = cutils.util.crc32.crc32(b"123")
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90 c2 = c1.copy()
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91 c1.update(b"4")
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92 c3 = zlib.crc32(b"12345")
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93 self.assertNotEqual(c2, c1)
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94 self.assertNotEqual(c1, c2._crc)
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95 self.assertNotEqual(c1, c3)
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96 self.assertNotEqual(c1, None)
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97
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98 def test_inequality_2(self):
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99 c1 = cutils.util.crc32.crc32(b"12345678")
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100 c2 = c1.copy()
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101 c2.update(b"9")
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102 c3 = zlib.crc32(b"1234567")
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103 self.assertNotEqual(c2, c1)
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104 self.assertNotEqual(c1, c2._crc)
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105 self.assertNotEqual(c1, c3)
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106 self.assertNotEqual(c1, None)
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107
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108 def test_equality_negative_number(self):
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109 c1 = cutils.util.crc32.crc32(b"123456789")
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110 # Py2 yields signed ints
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111 self.assertEqual(c1, -873187034)
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112 # Py3 yields unsigned ints
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113 self.assertEqual(c1, 3421780262)
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114
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115 def test_as_uint32(self):
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116 self.assertEqual(3421780262,
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117 cutils.util.crc32.crc32.as_uint32(-873187034))
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118
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119 def test_struct_pack(self):
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120 self.assertEqual(
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121 struct.pack(">I", 3421780262),
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122 struct.pack(">i", -873187034))
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123 self.assertEqual(
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124 struct.pack(">i", -2147483648),
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125 struct.pack(">I", 0x80000000))
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126
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128 if __name__ == "__main__":
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129 unittest.main()