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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 typing import Generic, TypeVar
import pytest
from hypothesis import given, strategies as st
from hypothesis.errors import ResolutionFailed
from tests.common.debug import check_can_generate_examples, find_any
from tests.common.utils import temp_registered
# Primitives:
# ===========
_InstanceType = TypeVar("_InstanceType", covariant=True)
_TypeArgType1 = TypeVar("_TypeArgType1", covariant=True)
_FirstType = TypeVar("_FirstType")
_LawType = TypeVar("_LawType")
class KindN(Generic[_InstanceType, _TypeArgType1]):
pass
class Lawful(Generic[_LawType]):
"""This type defines law-related operations."""
class MappableN(Generic[_FirstType], Lawful["MappableN[_FirstType]"]):
"""Behaves like a functor."""
# End definition:
# ===============
_ValueType = TypeVar("_ValueType")
class MyFunctor(KindN["MyFunctor", _ValueType], MappableN[_ValueType]):
def __init__(self, inner_value: _ValueType) -> None:
self.inner_value = inner_value
# Testing part:
# =============
def target_func(mappable: "MappableN[_FirstType]") -> bool:
return isinstance(mappable, MappableN)
@given(st.data())
def test_my_mappable(source: st.DataObject) -> None:
"""
Checks that complex types with multiple inheritance levels and strings are fine.
Regression test for https://github.com/HypothesisWorks/hypothesis/issues/3060
"""
# In `returns` we register all types in `__mro__`
# to be this exact type at the moment. But here, we only need `Mappable`.
# Current `__mro__` is `MyFunctor / Kind / Mappable`:
assert MyFunctor.__mro__[2] is MappableN
with temp_registered(
MyFunctor.__mro__[2],
st.builds(MyFunctor),
):
assert source.draw(st.builds(target_func)) is True
A = TypeVar("A")
B = TypeVar("B")
C = TypeVar("C")
D = TypeVar("D")
class _FirstBase(Generic[A, B]):
pass
class _SecondBase(Generic[C, D]):
pass
# To be tested:
class TwoGenericBases1(_FirstBase[A, B], _SecondBase[C, D]):
pass
class TwoGenericBases2(_FirstBase[C, D], _SecondBase[A, B]):
pass
class OneGenericOneConrete1(_FirstBase[int, str], _SecondBase[A, B]):
pass
class OneGenericOneConrete2(_FirstBase[A, B], _SecondBase[float, bool]):
pass
class MixedGenerics1(_FirstBase[int, B], _SecondBase[C, bool]):
pass
class MixedGenerics2(_FirstBase[A, str], _SecondBase[float, D]):
pass
class AllConcrete(_FirstBase[int, str], _SecondBase[float, bool]):
pass
_generic_test_types = (
TwoGenericBases1,
TwoGenericBases2,
OneGenericOneConrete1,
OneGenericOneConrete2,
MixedGenerics1,
MixedGenerics2,
AllConcrete,
)
@pytest.mark.parametrize("type_", _generic_test_types)
def test_several_generic_bases(type_):
with temp_registered(_FirstBase, st.builds(type_)):
find_any(st.builds(_FirstBase))
with temp_registered(_SecondBase, st.builds(type_)):
find_any(st.builds(_SecondBase))
def var_generic_func1(obj: _FirstBase[A, B]):
pass
def var_generic_func2(obj: _SecondBase[A, B]):
pass
def concrete_generic_func1(obj: _FirstBase[int, str]):
pass
def concrete_generic_func2(obj: _SecondBase[float, bool]):
pass
def mixed_generic_func1(obj: _FirstBase[A, str]):
pass
def mixed_generic_func2(obj: _SecondBase[float, D]):
pass
@pytest.mark.parametrize("type_", _generic_test_types)
@pytest.mark.parametrize(
"func",
[
var_generic_func1,
var_generic_func2,
concrete_generic_func1,
concrete_generic_func2,
mixed_generic_func1,
mixed_generic_func2,
],
)
def test_several_generic_bases_functions(type_, func):
with (
temp_registered(_FirstBase, st.builds(type_)),
temp_registered(_SecondBase, st.builds(type_)),
):
find_any(st.builds(func))
with temp_registered(type_, st.builds(type_)):
find_any(st.builds(func))
def wrong_generic_func1(obj: _FirstBase[A, None]):
pass
def wrong_generic_func2(obj: _SecondBase[None, bool]):
pass
@pytest.mark.parametrize("func", [wrong_generic_func1, wrong_generic_func2])
def test_several_generic_bases_wrong_functions(func):
with temp_registered(AllConcrete, st.builds(AllConcrete)):
# NOTE: For compatibility with Python 3.9's LL(1)
# parser, this is written as a nested with-statement,
# instead of a compound one.
with pytest.raises(ResolutionFailed):
check_can_generate_examples(st.builds(func))
|
