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annotate contrib/python-zstandard/tests/test_buffer_util.py @ 43999:de7838053207

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zstandard: vendor python-zstandard 0.13.0 Version 0.13.0 of the package was just released. It contains an upgraded zstd C library which can result in some performance wins, official support for Python 3.8, and a blackened code base. There were no meaningful code or functionality changes in this release of python-zstandard: just reformatting and an upgraded zstd library version. So the diff seems much larger than what it is. Files were added without modifications. The clang-format-ignorelist file was updated to reflect a new header file in the zstd distribution. # no-check-commit because 3rd party code has different style guidelines Differential Revision: https://phab.mercurial-scm.org/D7770
author Gregory Szorc <gregory.szorc@gmail.com>
date Sat, 28 Dec 2019 09:55:45 -0800
parents 675775c33ab6
children 5e84a96d865b
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1 import struct
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2 import unittest
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3
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4 import zstandard as zstd
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5
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6 from .common import TestCase
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7
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8 ss = struct.Struct("=QQ")
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9
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10
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11 class TestBufferWithSegments(TestCase):
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12 def test_arguments(self):
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13 if not hasattr(zstd, "BufferWithSegments"):
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14 self.skipTest("BufferWithSegments not available")
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15
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16 with self.assertRaises(TypeError):
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17 zstd.BufferWithSegments()
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18
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19 with self.assertRaises(TypeError):
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20 zstd.BufferWithSegments(b"foo")
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21
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22 # Segments data should be a multiple of 16.
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23 with self.assertRaisesRegex(
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24 ValueError, "segments array size is not a multiple of 16"
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25 ):
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26 zstd.BufferWithSegments(b"foo", b"\x00\x00")
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27
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28 def test_invalid_offset(self):
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29 if not hasattr(zstd, "BufferWithSegments"):
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30 self.skipTest("BufferWithSegments not available")
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31
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32 with self.assertRaisesRegex(
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33 ValueError, "offset within segments array references memory"
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34 ):
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35 zstd.BufferWithSegments(b"foo", ss.pack(0, 4))
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36
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37 def test_invalid_getitem(self):
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38 if not hasattr(zstd, "BufferWithSegments"):
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39 self.skipTest("BufferWithSegments not available")
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40
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41 b = zstd.BufferWithSegments(b"foo", ss.pack(0, 3))
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42
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43 with self.assertRaisesRegex(IndexError, "offset must be non-negative"):
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44 test = b[-10]
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45
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46 with self.assertRaisesRegex(IndexError, "offset must be less than 1"):
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47 test = b[1]
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48
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49 with self.assertRaisesRegex(IndexError, "offset must be less than 1"):
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50 test = b[2]
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51
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52 def test_single(self):
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53 if not hasattr(zstd, "BufferWithSegments"):
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54 self.skipTest("BufferWithSegments not available")
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55
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56 b = zstd.BufferWithSegments(b"foo", ss.pack(0, 3))
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57 self.assertEqual(len(b), 1)
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58 self.assertEqual(b.size, 3)
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59 self.assertEqual(b.tobytes(), b"foo")
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60
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61 self.assertEqual(len(b[0]), 3)
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62 self.assertEqual(b[0].offset, 0)
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63 self.assertEqual(b[0].tobytes(), b"foo")
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64
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65 def test_multiple(self):
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66 if not hasattr(zstd, "BufferWithSegments"):
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67 self.skipTest("BufferWithSegments not available")
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68
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69 b = zstd.BufferWithSegments(
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70 b"foofooxfooxy", b"".join([ss.pack(0, 3), ss.pack(3, 4), ss.pack(7, 5)])
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71 )
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72 self.assertEqual(len(b), 3)
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73 self.assertEqual(b.size, 12)
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74 self.assertEqual(b.tobytes(), b"foofooxfooxy")
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75
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76 self.assertEqual(b[0].tobytes(), b"foo")
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77 self.assertEqual(b[1].tobytes(), b"foox")
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78 self.assertEqual(b[2].tobytes(), b"fooxy")
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79
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80
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81 class TestBufferWithSegmentsCollection(TestCase):
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82 def test_empty_constructor(self):
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83 if not hasattr(zstd, "BufferWithSegmentsCollection"):
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84 self.skipTest("BufferWithSegmentsCollection not available")
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85
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86 with self.assertRaisesRegex(ValueError, "must pass at least 1 argument"):
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87 zstd.BufferWithSegmentsCollection()
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88
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89 def test_argument_validation(self):
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90 if not hasattr(zstd, "BufferWithSegmentsCollection"):
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91 self.skipTest("BufferWithSegmentsCollection not available")
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92
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93 with self.assertRaisesRegex(TypeError, "arguments must be BufferWithSegments"):
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94 zstd.BufferWithSegmentsCollection(None)
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95
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96 with self.assertRaisesRegex(TypeError, "arguments must be BufferWithSegments"):
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97 zstd.BufferWithSegmentsCollection(
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98 zstd.BufferWithSegments(b"foo", ss.pack(0, 3)), None
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99 )
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100
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101 with self.assertRaisesRegex(
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102 ValueError, "ZstdBufferWithSegments cannot be empty"
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103 ):
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104 zstd.BufferWithSegmentsCollection(zstd.BufferWithSegments(b"", b""))
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105
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106 def test_length(self):
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107 if not hasattr(zstd, "BufferWithSegmentsCollection"):
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108 self.skipTest("BufferWithSegmentsCollection not available")
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109
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110 b1 = zstd.BufferWithSegments(b"foo", ss.pack(0, 3))
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111 b2 = zstd.BufferWithSegments(
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112 b"barbaz", b"".join([ss.pack(0, 3), ss.pack(3, 3)])
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113 )
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114
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115 c = zstd.BufferWithSegmentsCollection(b1)
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116 self.assertEqual(len(c), 1)
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117 self.assertEqual(c.size(), 3)
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118
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119 c = zstd.BufferWithSegmentsCollection(b2)
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120 self.assertEqual(len(c), 2)
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121 self.assertEqual(c.size(), 6)
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122
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123 c = zstd.BufferWithSegmentsCollection(b1, b2)
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124 self.assertEqual(len(c), 3)
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125 self.assertEqual(c.size(), 9)
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126
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127 def test_getitem(self):
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128 if not hasattr(zstd, "BufferWithSegmentsCollection"):
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129 self.skipTest("BufferWithSegmentsCollection not available")
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130
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131 b1 = zstd.BufferWithSegments(b"foo", ss.pack(0, 3))
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132 b2 = zstd.BufferWithSegments(
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133 b"barbaz", b"".join([ss.pack(0, 3), ss.pack(3, 3)])
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134 )
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135
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136 c = zstd.BufferWithSegmentsCollection(b1, b2)
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137
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138 with self.assertRaisesRegex(IndexError, "offset must be less than 3"):
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139 c[3]
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140
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141 with self.assertRaisesRegex(IndexError, "offset must be less than 3"):
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142 c[4]
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143
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144 self.assertEqual(c[0].tobytes(), b"foo")
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145 self.assertEqual(c[1].tobytes(), b"bar")
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146 self.assertEqual(c[2].tobytes(), b"baz")