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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 collections.abc
import dataclasses
import sys
import typing
import pytest
from hypothesis import given, strategies as st
from hypothesis.errors import InvalidArgument
from tests.common.debug import (
assert_all_examples,
assert_simple_property,
check_can_generate_examples,
find_any,
)
from tests.common.utils import temp_registered
@pytest.mark.parametrize(
"annotated_type,expected_strategy_repr",
[
(typing.Annotated[int, "foo"], "integers()"),
(typing.Annotated[list[float], "foo"], "lists(floats())"),
(typing.Annotated[typing.Annotated[str, "foo"], "bar"], "text()"),
(
typing.Annotated[typing.Annotated[list[dict[str, bool]], "foo"], "bar"],
"lists(dictionaries(keys=text(), values=booleans()))",
),
],
)
def test_typing_Annotated(annotated_type, expected_strategy_repr):
assert repr(st.from_type(annotated_type)) == expected_strategy_repr
PositiveInt = typing.Annotated[int, st.integers(min_value=1)]
MoreThanTenInt = typing.Annotated[PositiveInt, st.integers(min_value=10 + 1)]
WithTwoStrategies = typing.Annotated[int, st.integers(), st.none()]
ExtraAnnotationNoStrategy = typing.Annotated[PositiveInt, "metadata"]
def arg_positive(x: PositiveInt):
assert x > 0
def arg_more_than_ten(x: MoreThanTenInt):
assert x > 10
@given(st.data())
def test_annotated_positive_int(data):
data.draw(st.builds(arg_positive))
@given(st.data())
def test_annotated_more_than_ten(data):
data.draw(st.builds(arg_more_than_ten))
@given(st.data())
def test_annotated_with_two_strategies(data):
assert data.draw(st.from_type(WithTwoStrategies)) is None
@given(st.data())
def test_annotated_extra_metadata(data):
assert data.draw(st.from_type(ExtraAnnotationNoStrategy)) > 0
@dataclasses.dataclass
class User:
id: int
following: list["User"] # works with typing.List
@pytest.mark.skipif(sys.version_info[:2] >= (3, 11), reason="works in new Pythons")
def test_string_forward_ref_message():
# See https://github.com/HypothesisWorks/hypothesis/issues/3016
s = st.builds(User)
with pytest.raises(InvalidArgument, match="`from __future__ import annotations`"):
check_can_generate_examples(s)
def test_issue_3080():
# Check for https://github.com/HypothesisWorks/hypothesis/issues/3080
s = st.from_type(typing.Union[list[int], int])
find_any(s, lambda x: isinstance(x, int))
find_any(s, lambda x: isinstance(x, list))
@dataclasses.dataclass
class TypingTuple:
a: dict[tuple[int, int], str]
@dataclasses.dataclass
class BuiltinTuple:
a: dict[tuple[int, int], str]
TestDataClass = typing.Union[TypingTuple, BuiltinTuple]
@pytest.mark.parametrize("data_class", [TypingTuple, BuiltinTuple])
@given(data=st.data())
def test_from_type_with_tuple_works(data, data_class: TestDataClass):
value: TestDataClass = data.draw(st.from_type(data_class))
assert len(value.a) >= 0
def _shorter_lists(list_type):
return st.lists(st.from_type(*typing.get_args(list_type)), max_size=2)
def test_can_register_builtin_list():
# Regression test for https://github.com/HypothesisWorks/hypothesis/issues/3635
with temp_registered(list, _shorter_lists):
assert_all_examples(
st.from_type(list[int]),
lambda ls: len(ls) <= 2 and {type(x) for x in ls}.issubset({int}),
)
T = typing.TypeVar("T")
@typing.runtime_checkable
class Fooable(typing.Protocol[T]):
def foo(self): ...
class FooableConcrete(tuple):
def foo(self):
pass
def test_only_tuple_subclasses_in_typing_type():
# A generic typing type (such as Fooable) whose only concrete
# instantiations are tuples should still generate tuples. This is in
# contrast to test_tuple_subclasses_not_generic_sequences, which discards
# tuples if there are any alternatives.
with temp_registered(FooableConcrete, st.builds(FooableConcrete)):
s = st.from_type(Fooable[int])
assert_all_examples(s, lambda x: type(x) is FooableConcrete)
def test_lookup_registered_tuple():
sentinel = object()
typ = tuple[int]
with temp_registered(tuple, st.just(sentinel)):
assert_simple_property(st.from_type(typ), lambda v: v is sentinel)
assert_simple_property(st.from_type(typ), lambda v: v is not sentinel)
sentinel = object()
class LazyStrategyAnnotation:
__is_annotated_types_grouped_metadata__ = True
def __iter__(self):
return iter([st.just(sentinel)])
@given(...)
def test_grouped_protocol_strategy(x: typing.Annotated[int, LazyStrategyAnnotation()]):
assert x is sentinel
def test_collections_abc_callable_none():
# https://github.com/HypothesisWorks/hypothesis/issues/4192
s = st.from_type(collections.abc.Callable[[None], None])
assert_all_examples(s, lambda x: callable(x) and x(None) is None)
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