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annotate contrib/python-zstandard/tests/test_train_dictionary.py @ 43886:fe0daceb51d0

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hgweb: fix error in docstring Despite the subtle semantic difference, this sentence really meant to say "overridden", not "overwritten".
author Jordi Guti?rrez Hermoso <jordigh@octave.org>
date Thu, 12 Dec 2019 11:41:28 -0500
parents 69de49c4e39c
children de7838053207
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 import struct
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2 import sys
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3 import unittest
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4
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5 import zstandard as zstd
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6
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7 from . common import (
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8 generate_samples,
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9 make_cffi,
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10 random_input_data,
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11 )
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12
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13 if sys.version_info[0] >= 3:
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14 int_type = int
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15 else:
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16 int_type = long
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17
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18
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19 @make_cffi
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20 class TestTrainDictionary(unittest.TestCase):
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21 def test_no_args(self):
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22 with self.assertRaises(TypeError):
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23 zstd.train_dictionary()
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24
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25 def test_bad_args(self):
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26 with self.assertRaises(TypeError):
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27 zstd.train_dictionary(8192, u'foo')
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28
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29 with self.assertRaises(ValueError):
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30 zstd.train_dictionary(8192, [u'foo'])
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31
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32 def test_no_params(self):
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33 d = zstd.train_dictionary(8192, random_input_data())
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34 self.assertIsInstance(d.dict_id(), int_type)
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35
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36 # The dictionary ID may be different across platforms.
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37 expected = b'\x37\xa4\x30\xec' + struct.pack('<I', d.dict_id())
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38
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39 data = d.as_bytes()
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40 self.assertEqual(data[0:8], expected)
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41
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42 def test_basic(self):
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43 d = zstd.train_dictionary(8192, generate_samples(), k=64, d=16)
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44 self.assertIsInstance(d.dict_id(), int_type)
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45
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46 data = d.as_bytes()
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47 self.assertEqual(data[0:4], b'\x37\xa4\x30\xec')
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48
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49 self.assertEqual(d.k, 64)
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50 self.assertEqual(d.d, 16)
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51
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52 def test_set_dict_id(self):
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53 d = zstd.train_dictionary(8192, generate_samples(), k=64, d=16,
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54 dict_id=42)
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55 self.assertEqual(d.dict_id(), 42)
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56
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57 def test_optimize(self):
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58 d = zstd.train_dictionary(8192, generate_samples(), threads=-1, steps=1,
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59 d=16)
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60
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61 # This varies by platform.
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62 self.assertIn(d.k, (50, 2000))
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63 self.assertEqual(d.d, 16)
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64
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65 @make_cffi
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66 class TestCompressionDict(unittest.TestCase):
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67 def test_bad_mode(self):
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68 with self.assertRaisesRegexp(ValueError, 'invalid dictionary load mode'):
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69 zstd.ZstdCompressionDict(b'foo', dict_type=42)
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70
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71 def test_bad_precompute_compress(self):
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72 d = zstd.train_dictionary(8192, generate_samples(), k=64, d=16)
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73
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74 with self.assertRaisesRegexp(ValueError, 'must specify one of level or '):
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75 d.precompute_compress()
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76
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77 with self.assertRaisesRegexp(ValueError, 'must only specify one of level or '):
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78 d.precompute_compress(level=3,
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79 compression_params=zstd.CompressionParameters())
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80
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81 def test_precompute_compress_rawcontent(self):
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82 d = zstd.ZstdCompressionDict(b'dictcontent' * 64,
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83 dict_type=zstd.DICT_TYPE_RAWCONTENT)
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84 d.precompute_compress(level=1)
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85
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86 d = zstd.ZstdCompressionDict(b'dictcontent' * 64,
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87 dict_type=zstd.DICT_TYPE_FULLDICT)
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88 with self.assertRaisesRegexp(zstd.ZstdError, 'unable to precompute dictionary'):
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89 d.precompute_compress(level=1)