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# This file is part of Hypothesis, which may be found at
# https://github.com/HypothesisWorks/hypothesis/
#
# Copyright the Hypothesis Authors.
# Individual contributors are listed in AUTHORS.rst and the git log.
#
# This Source Code Form is subject to the terms of the Mozilla Public License,
# v. 2.0. If a copy of the MPL was not distributed with this file, You can
# obtain one at https://mozilla.org/MPL/2.0/.
from collections.abc import Buffer
from dataclasses import dataclass
import pytest
from hypothesis import given, strategies as st
from tests.common.debug import find_any
@dataclass
class A:
constant = 42
x: int
# see https://docs.python.org/3/reference/datamodel.html#python-buffer-protocol
# and https://peps.python.org/pep-0688/
def __buffer__(self, flags):
return memoryview(
self.constant.to_bytes() + self.x.to_bytes(length=32, signed=True)
)
@given(st.from_type(memoryview[A]))
def test_resolve_bufferlike_memoryview(v):
assert isinstance(v, memoryview)
assert v[0] == A.constant
assert len(v) == 1 + 32
def test_errors_when___buffer___not_implemented():
class NoBuffer:
pass
@given(st.from_type(memoryview[NoBuffer]))
def f(v):
pass
with pytest.raises(
TypeError, match="a bytes-like object is required, not 'NoBuffer'"
):
f()
def test_resolve_Buffer():
s = st.from_type(Buffer)
# on 3.12, we can generate neither. On 3.13, we can generate bytearray, because
# the removal of ByteString stops blocking bytearray from being the maximal
# registered type. On 3.14, we can generate both, because memoryview becomes
# generic.
find_any(s, lambda v: isinstance(v, memoryview))
find_any(s, lambda v: isinstance(v, bytearray))
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