/
test_snappy.py
157 lines (131 loc) · 6.28 KB
/
test_snappy.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
#!/usr/bin/env python
#
# Copyright (c) 2011, Andres Moreira <andres@andresmoreira.com>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# * Neither the name of the authors nor the
# names of its contributors may be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL ANDRES MOREIRA BE LIABLE FOR ANY DIRECT,
# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
import os
import platform
import sys
import random
import snappy
import struct
from unittest import TestCase
class SnappyModuleTest(TestCase):
def test_version(self):
assert tuple(map(int, snappy.__version__.split("."))) >= (0, 6, 1)
# Make sure that __version__ is identical to the version defined in setup.py
with open(os.path.join(os.path.dirname(__file__), "setup.py")) as f:
version_line, = (l for l in f.read().splitlines() if l.startswith("version"))
assert version_line.split("=")[1].strip(" '\"") == snappy.__version__
class SnappyCompressionTest(TestCase):
def test_simple_compress(self):
text = "hello world!".encode('utf-8')
compressed = snappy.compress(text)
self.assertEqual(text, snappy.uncompress(compressed))
def test_moredata_compress(self):
text = "snappy +" * 1000 + " " + "by " * 1000 + " google"
text = text.encode('utf-8')
compressed = snappy.compress(text)
self.assertEqual(text, snappy.uncompress(compressed))
def test_randombytes_compress(self):
_bytes = repr(os.urandom(1000)).encode('utf-8')
compressed = snappy.compress(_bytes)
self.assertEqual(_bytes, snappy.uncompress(compressed))
def test_randombytes2_compress(self):
_bytes = bytes(os.urandom(10000))
compressed = snappy.compress(_bytes)
self.assertEqual(_bytes, snappy.uncompress(compressed))
def test_uncompress_error(self):
self.assertRaises(snappy.UncompressError, snappy.uncompress,
"hoa".encode('utf-8'))
if sys.version_info[0] == 2:
def test_unicode_compress(self):
text = "hello unicode world!".decode('utf-8')
compressed = snappy.compress(text)
self.assertEqual(text, snappy.uncompress(compressed))
def test_decompress(self):
# decompress == uncompress, just to support compatibility with zlib
text = "hello world!".encode('utf-8')
compressed = snappy.compress(text)
self.assertEqual(text, snappy.decompress(compressed))
def test_big_string(self):
text = ('a'*10000000).encode('utf-8')
compressed = snappy.compress(text)
self.assertEqual(text, snappy.decompress(compressed))
if platform.python_implementation() == 'CPython':
def test_compress_memoryview(self):
data = b"hello world!"
expected = snappy.compress(data)
actual = snappy.compress(memoryview(data))
self.assertEqual(actual, expected)
def test_decompress_memoryview(self):
data = b"hello world!"
compressed = snappy.compress(data)
expected = snappy.uncompress(compressed)
actual = snappy.uncompress(memoryview(compressed))
self.assertEqual(actual, expected)
class SnappyValidBufferTest(TestCase):
def test_valid_compressed_buffer(self):
text = "hello world!".encode('utf-8')
compressed = snappy.compress(text)
uncompressed = snappy.uncompress(compressed)
self.assertEqual(text == uncompressed,
snappy.isValidCompressed(compressed))
def test_invalid_compressed_buffer(self):
self.assertFalse(snappy.isValidCompressed(
"not compressed".encode('utf-8')))
class SnappyStreaming(TestCase):
def test_random(self):
for _ in range(100):
compressor = snappy.StreamCompressor()
decompressor = snappy.StreamDecompressor()
data = b""
compressed = b""
for _ in range(random.randint(0, 3)):
chunk = os.urandom(random.randint(0, snappy.snappy._CHUNK_MAX * 2))
data += chunk
compressed += compressor.add_chunk(
chunk, compress=random.choice([True, False, None]))
upper_bound = random.choice([256, snappy.snappy._CHUNK_MAX * 2])
while compressed:
size = random.randint(0, upper_bound)
chunk, compressed = compressed[:size], compressed[size:]
chunk = decompressor.decompress(chunk)
self.assertEqual(data[:len(chunk)], chunk)
data = data[len(chunk):]
decompressor.flush()
self.assertEqual(len(data), 0)
def test_concatenation(self):
data1 = os.urandom(snappy.snappy._CHUNK_MAX * 2)
data2 = os.urandom(4096)
decompressor = snappy.StreamDecompressor()
self.assertEqual(
decompressor.decompress(
snappy.StreamCompressor().compress(data1) +
snappy.StreamCompressor().compress(data2)),
data1 + data2)
if __name__ == "__main__":
import unittest
unittest.main()