view contrib/python-zstandard/tests/test_estimate_sizes.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

try:
    import unittest2 as unittest
except ImportError:
    import unittest

import zstd

from . common import (
    make_cffi,
)


@make_cffi
class TestSizes(unittest.TestCase):
    def test_decompression_size(self):
        size = zstd.estimate_decompression_context_size()
        self.assertGreater(size, 100000)

    def test_compression_size(self):
        params = zstd.get_compression_parameters(3)
        size = zstd.estimate_compression_context_size(params)
        self.assertGreater(size, 100000)