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annotate contrib/python-zstandard/tests/test_buffer_util.py @ 37495:b1fb341d8a61

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zstandard: vendor python-zstandard 0.9.0 This was just released. It features a number of goodies. More info at https://gregoryszorc.com/blog/2018/04/09/release-of-python-zstandard-0.9/. The clang-format ignore list was updated to reflect the new source of files. The project contains a vendored copy of zstandard 1.3.4. The old version was 1.1.3. One of the changes between those versions is that zstandard is now dual licensed BSD + GPLv2 and the patent rights grant has been removed. Good riddance. The API should be backwards compatible. So no changes in core should be needed. However, there were a number of changes in the library that we'll want to adapt to. Those will be addressed in subsequent commits. Differential Revision: https://phab.mercurial-scm.org/D3198
author Gregory Szorc <gregory.szorc@gmail.com>
date Mon, 09 Apr 2018 10:13:29 -0700
parents e0dc40530c5a
children 675775c33ab6
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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 ss = struct.Struct('=QQ')
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7
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8
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9 class TestBufferWithSegments(unittest.TestCase):
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10 def test_arguments(self):
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11 with self.assertRaises(TypeError):
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12 zstd.BufferWithSegments()
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13
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14 with self.assertRaises(TypeError):
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15 zstd.BufferWithSegments(b'foo')
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16
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17 # Segments data should be a multiple of 16.
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18 with self.assertRaisesRegexp(ValueError, 'segments array size is not a multiple of 16'):
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19 zstd.BufferWithSegments(b'foo', b'\x00\x00')
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20
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21 def test_invalid_offset(self):
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22 with self.assertRaisesRegexp(ValueError, 'offset within segments array references memory'):
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23 zstd.BufferWithSegments(b'foo', ss.pack(0, 4))
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24
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25 def test_invalid_getitem(self):
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26 b = zstd.BufferWithSegments(b'foo', ss.pack(0, 3))
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27
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28 with self.assertRaisesRegexp(IndexError, 'offset must be non-negative'):
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29 test = b[-10]
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30
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31 with self.assertRaisesRegexp(IndexError, 'offset must be less than 1'):
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32 test = b[1]
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33
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34 with self.assertRaisesRegexp(IndexError, 'offset must be less than 1'):
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35 test = b[2]
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36
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37 def test_single(self):
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38 b = zstd.BufferWithSegments(b'foo', ss.pack(0, 3))
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39 self.assertEqual(len(b), 1)
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40 self.assertEqual(b.size, 3)
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41 self.assertEqual(b.tobytes(), b'foo')
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42
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43 self.assertEqual(len(b[0]), 3)
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44 self.assertEqual(b[0].offset, 0)
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45 self.assertEqual(b[0].tobytes(), b'foo')
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46
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47 def test_multiple(self):
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48 b = zstd.BufferWithSegments(b'foofooxfooxy', b''.join([ss.pack(0, 3),
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49 ss.pack(3, 4),
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50 ss.pack(7, 5)]))
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51 self.assertEqual(len(b), 3)
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52 self.assertEqual(b.size, 12)
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53 self.assertEqual(b.tobytes(), b'foofooxfooxy')
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54
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55 self.assertEqual(b[0].tobytes(), b'foo')
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56 self.assertEqual(b[1].tobytes(), b'foox')
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57 self.assertEqual(b[2].tobytes(), b'fooxy')
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58
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59
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60 class TestBufferWithSegmentsCollection(unittest.TestCase):
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61 def test_empty_constructor(self):
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62 with self.assertRaisesRegexp(ValueError, 'must pass at least 1 argument'):
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63 zstd.BufferWithSegmentsCollection()
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64
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65 def test_argument_validation(self):
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66 with self.assertRaisesRegexp(TypeError, 'arguments must be BufferWithSegments'):
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67 zstd.BufferWithSegmentsCollection(None)
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68
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69 with self.assertRaisesRegexp(TypeError, 'arguments must be BufferWithSegments'):
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70 zstd.BufferWithSegmentsCollection(zstd.BufferWithSegments(b'foo', ss.pack(0, 3)),
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71 None)
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72
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73 with self.assertRaisesRegexp(ValueError, 'ZstdBufferWithSegments cannot be empty'):
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74 zstd.BufferWithSegmentsCollection(zstd.BufferWithSegments(b'', b''))
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75
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76 def test_length(self):
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77 b1 = zstd.BufferWithSegments(b'foo', ss.pack(0, 3))
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78 b2 = zstd.BufferWithSegments(b'barbaz', b''.join([ss.pack(0, 3),
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79 ss.pack(3, 3)]))
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80
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81 c = zstd.BufferWithSegmentsCollection(b1)
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82 self.assertEqual(len(c), 1)
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83 self.assertEqual(c.size(), 3)
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84
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85 c = zstd.BufferWithSegmentsCollection(b2)
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86 self.assertEqual(len(c), 2)
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87 self.assertEqual(c.size(), 6)
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88
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89 c = zstd.BufferWithSegmentsCollection(b1, b2)
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90 self.assertEqual(len(c), 3)
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91 self.assertEqual(c.size(), 9)
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92
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93 def test_getitem(self):
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94 b1 = zstd.BufferWithSegments(b'foo', ss.pack(0, 3))
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95 b2 = zstd.BufferWithSegments(b'barbaz', b''.join([ss.pack(0, 3),
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96 ss.pack(3, 3)]))
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97
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98 c = zstd.BufferWithSegmentsCollection(b1, b2)
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99
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100 with self.assertRaisesRegexp(IndexError, 'offset must be less than 3'):
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101 c[3]
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102
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103 with self.assertRaisesRegexp(IndexError, 'offset must be less than 3'):
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104 c[4]
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105
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106 self.assertEqual(c[0].tobytes(), b'foo')
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107 self.assertEqual(c[1].tobytes(), b'bar')
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108 self.assertEqual(c[2].tobytes(), b'baz')