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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/.
import typing
import attr
import pytest
from hypothesis import given, strategies as st
from hypothesis.errors import ResolutionFailed
from tests.common.debug import check_can_generate_examples
@attr.s
class Inferrables:
type_ = attr.ib(type=int)
type_converter = attr.ib(converter=bool)
validator_type = attr.ib(validator=attr.validators.instance_of(str))
validator_type_tuple = attr.ib(validator=attr.validators.instance_of((str, int)))
validator_type_multiple = attr.ib(
validator=[
attr.validators.instance_of(str),
attr.validators.instance_of((str, int, bool)),
]
)
validator_type_has_overlap = attr.ib(
validator=[
attr.validators.instance_of(str),
attr.validators.instance_of((str, list)),
attr.validators.instance_of(object),
]
)
validator_optional = attr.ib(
validator=attr.validators.optional(lambda inst, atrib, val: float(val))
)
validator_in = attr.ib(validator=attr.validators.in_([1, 2, 3]))
validator_in_multiple = attr.ib(
validator=[attr.validators.in_(list(range(100))), attr.validators.in_([1, -1])]
)
validator_in_multiple_strings = attr.ib(
validator=[attr.validators.in_("abcd"), attr.validators.in_(["ab", "cd"])]
)
typing_list = attr.ib(type=list[int])
typing_list_of_list = attr.ib(type=list[list[int]])
typing_dict = attr.ib(type=dict[str, int])
typing_optional = attr.ib(type=typing.Optional[bool])
typing_union = attr.ib(type=typing.Union[str, int])
has_default = attr.ib(default=0)
has_default_factory = attr.ib(default=attr.Factory(list))
has_default_factory_takes_self = attr.ib( # uninferrable but has default
default=attr.Factory(lambda _: [], takes_self=True)
)
@attr.s
class Required:
a = attr.ib()
@attr.s
class UnhelpfulConverter:
a = attr.ib(converter=lambda x: x)
@given(st.builds(Inferrables, has_default=..., has_default_factory=...))
def test_attrs_inference_builds(c):
pass
@given(st.from_type(Inferrables))
def test_attrs_inference_from_type(c):
pass
@pytest.mark.parametrize("c", [Required, UnhelpfulConverter])
def test_cannot_infer(c):
with pytest.raises(ResolutionFailed):
check_can_generate_examples(st.builds(c))
def test_cannot_infer_takes_self():
with pytest.raises(ResolutionFailed):
check_can_generate_examples(
st.builds(Inferrables, has_default_factory_takes_self=...)
)
@attr.s
class HasPrivateAttribute:
_x: int = attr.ib()
@pytest.mark.parametrize("s", [st.just(42)])
def test_private_attribute(s):
check_can_generate_examples(st.builds(HasPrivateAttribute, x=s))
def test_private_attribute_underscore_fails():
with pytest.raises(TypeError, match="unexpected keyword argument '_x'"):
check_can_generate_examples(st.builds(HasPrivateAttribute, _x=st.just(42)))
def test_private_attribute_underscore_infer_fails():
# this has a slightly different failure case, because it goes through
# attrs-specific resolution logic.
with pytest.raises(
TypeError, match="Unexpected keyword argument _x for attrs class"
):
check_can_generate_examples(st.builds(HasPrivateAttribute, _x=...))
@attr.s
class HasAliasedAttribute:
x: int = attr.ib(alias="crazyname")
@pytest.mark.parametrize("s", [st.just(42)])
def test_aliased_attribute(s):
check_can_generate_examples(st.builds(HasAliasedAttribute, crazyname=s))
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