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typing_pep604_test.py
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typing_pep604_test.py
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from __future__ import annotations
import pytest
from pyupgrade._data import Settings
from pyupgrade._main import _fix_plugins
@pytest.mark.parametrize(
('s', 'version'),
(
pytest.param(
'from typing import Union\n'
'x: Union[int, str]\n',
(3, 9),
id='<3.10 Union',
),
pytest.param(
'from typing import Optional\n'
'x: Optional[str]\n',
(3, 9),
id='<3.10 Optional',
),
pytest.param(
'from __future__ import annotations\n'
'from typing import Union\n'
'SomeAlias = Union[int, str]\n',
(3, 9),
id='<3.9 not in a type annotation context',
),
# https://github.com/python/mypy/issues/9945
pytest.param(
'from __future__ import annotations\n'
'from typing import Union\n'
'SomeAlias = Union[int, str]\n',
(3, 10),
id='3.10+ not in a type annotation context',
),
# https://github.com/python/mypy/issues/9998
pytest.param(
'from typing import Union\n'
'def f() -> Union[()]: ...\n',
(3, 10),
id='3.10+ empty Union',
),
# https://github.com/asottile/pyupgrade/issues/567
pytest.param(
'from typing import Optional\n'
'def f() -> Optional["str"]: ...\n',
(3, 10),
id='3.10+ Optional of forward reference',
),
pytest.param(
'from typing import Union\n'
'def f() -> Union[int, "str"]: ...\n',
(3, 10),
id='3.10+ Union of forward reference',
),
pytest.param(
'from typing import Union\n'
'def f() -> Union[1:2]: ...\n',
(3, 10),
id='invalid Union slicing',
),
),
)
def test_fix_pep604_types_noop(s, version):
assert _fix_plugins(s, settings=Settings(min_version=version)) == s
def test_noop_keep_runtime_typing():
s = '''\
from __future__ import annotations
from typing import Union
def f(x: Union[int, str]) -> None: ...
'''
assert _fix_plugins(s, settings=Settings(keep_runtime_typing=True)) == s
def test_keep_runtime_typing_ignored_in_py310():
s = '''\
from __future__ import annotations
from typing import Union
def f(x: Union[int, str]) -> None: ...
'''
expected = '''\
from __future__ import annotations
from typing import Union
def f(x: int | str) -> None: ...
'''
settings = Settings(min_version=(3, 10), keep_runtime_typing=True)
assert _fix_plugins(s, settings=settings) == expected
@pytest.mark.parametrize(
('s', 'expected'),
(
pytest.param(
'from typing import Union\n'
'x: Union[int, str]\n',
'from typing import Union\n'
'x: int | str\n',
id='Union rewrite',
),
pytest.param(
'x: typing.Union[int]\n',
'x: int\n',
id='Union of only one value',
),
pytest.param(
'x: typing.Union[Foo[str, int], str]\n',
'x: Foo[str, int] | str\n',
id='Union containing a value with brackets',
),
pytest.param(
'x: typing.Union[typing.List[str], str]\n',
'x: list[str] | str\n',
id='Union containing pep585 rewritten type',
),
pytest.param(
'x: typing.Union[int, str,]\n',
'x: int | str\n',
id='Union trailing comma',
),
pytest.param(
'x: typing.Union[(int, str)]\n',
'x: int | str\n',
id='Union, parenthesized tuple',
),
pytest.param(
'x: typing.Union[\n'
' int,\n'
' str\n'
']\n',
'x: (\n'
' int |\n'
' str\n'
')\n',
id='Union multiple lines',
),
pytest.param(
'x: typing.Union[\n'
' int,\n'
' str,\n'
']\n',
'x: (\n'
' int |\n'
' str\n'
')\n',
id='Union multiple lines with trailing commas',
),
pytest.param(
'from typing import Optional\n'
'x: Optional[str]\n',
'from typing import Optional\n'
'x: str | None\n',
id='Optional rewrite',
),
pytest.param(
'x: typing.Optional[\n'
' ComplicatedLongType[int]\n'
']\n',
'x: None | (\n'
' ComplicatedLongType[int]\n'
')\n',
id='Optional rewrite multi-line',
),
pytest.param(
'from __future__ import annotations\n'
'from typing import Optional\n'
'x: Optional["str"]\n',
'from __future__ import annotations\n'
'from typing import Optional\n'
'x: str | None\n',
id='Optional rewrite with forward reference',
),
pytest.param(
'from typing import Union, Sequence\n'
'def f(x: Union[Union[A, B], Sequence[Union[C, D]]]): pass\n',
'from typing import Union\n'
'from collections.abc import Sequence\n'
'def f(x: A | B | Sequence[C | D]): pass\n',
id='nested unions',
),
),
)
def test_fix_pep604_types(s, expected):
assert _fix_plugins(s, settings=Settings(min_version=(3, 10))) == expected
@pytest.mark.parametrize(
('s', 'expected'),
(
pytest.param(
'from __future__ import annotations\n'
'from typing import Union\n'
'x: Union[int, str]\n',
'from __future__ import annotations\n'
'from typing import Union\n'
'x: int | str\n',
id='variable annotations',
),
pytest.param(
'from __future__ import annotations\n'
'from typing import Union\n'
'def f(x: Union[int, str]) -> None: ...\n',
'from __future__ import annotations\n'
'from typing import Union\n'
'def f(x: int | str) -> None: ...\n',
id='argument annotations',
),
pytest.param(
'from __future__ import annotations\n'
'from typing import Union\n'
'def f() -> Union[int, str]: ...\n',
'from __future__ import annotations\n'
'from typing import Union\n'
'def f() -> int | str: ...\n',
id='return annotations',
),
),
)
def test_fix_generic_types_future_annotations(s, expected):
assert _fix_plugins(s, settings=Settings()) == expected
# TODO: test multi-line as well