view contrib/python-zstandard/tests/test_module_attributes.py @ 31796:e0dc40530c5a

zstd: vendor python-zstandard 0.8.0

Commit 81e1f5bbf1fc54808649562d3ed829730765c540 from
https://github.com/indygreg/python-zstandard is imported without
modifications (other than removing unwanted files).

Updates relevant to Mercurial include:

* Support for multi-threaded compression (we can use this for
  bundle and wire protocol compression).
* APIs for batch compression and decompression operations using
  multiple threads and optimal memory allocation mechanism. (Can
  be useful for revlog perf improvements.)
* A ``BufferWithSegments`` type that models a single memory buffer
  containing N discrete items of known lengths. This type can be
  used for very efficient 0-copy data operations.

# no-check-commit

from __future__ import unicode_literals

try:
    import unittest2 as unittest
except ImportError:
    import unittest

import zstd

from . common import (
    make_cffi,
)


@make_cffi
class TestModuleAttributes(unittest.TestCase):
    def test_version(self):
        self.assertEqual(zstd.ZSTD_VERSION, (1, 1, 3))

    def test_constants(self):
        self.assertEqual(zstd.MAX_COMPRESSION_LEVEL, 22)
        self.assertEqual(zstd.FRAME_HEADER, b'\x28\xb5\x2f\xfd')

    def test_hasattr(self):
        attrs = (
            'COMPRESSION_RECOMMENDED_INPUT_SIZE',
            'COMPRESSION_RECOMMENDED_OUTPUT_SIZE',
            'DECOMPRESSION_RECOMMENDED_INPUT_SIZE',
            'DECOMPRESSION_RECOMMENDED_OUTPUT_SIZE',
            'MAGIC_NUMBER',
            'WINDOWLOG_MIN',
            'WINDOWLOG_MAX',
            'CHAINLOG_MIN',
            'CHAINLOG_MAX',
            'HASHLOG_MIN',
            'HASHLOG_MAX',
            'HASHLOG3_MAX',
            'SEARCHLOG_MIN',
            'SEARCHLOG_MAX',
            'SEARCHLENGTH_MIN',
            'SEARCHLENGTH_MAX',
            'TARGETLENGTH_MIN',
            'TARGETLENGTH_MAX',
            'STRATEGY_FAST',
            'STRATEGY_DFAST',
            'STRATEGY_GREEDY',
            'STRATEGY_LAZY',
            'STRATEGY_LAZY2',
            'STRATEGY_BTLAZY2',
            'STRATEGY_BTOPT',
        )

        for a in attrs:
            self.assertTrue(hasattr(zstd, a), a)