attrs/tests/test_pyright.py

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# SPDX-License-Identifier: MIT
from __future__ import annotations
import json
import shutil
import subprocess
from pathlib import Path
import pytest
pytestmark = [
pytest.mark.skipif(
shutil.which("pyright") is None, reason="Requires pyright."
),
]
def parse_pyright_output(test_file: Path) -> set[tuple[str, str]]:
pyright = subprocess.run( # noqa: PLW1510
["pyright", "--outputjson", str(test_file)], capture_output=True
)
pyright_result = json.loads(pyright.stdout)
# We use tuples instead of proper classes to get nicer diffs from pytest.
return {
(d["severity"], d["message"])
for d in pyright_result["generalDiagnostics"]
}
def test_pyright_baseline():
"""
The typing.dataclass_transform decorator allows pyright to determine
attrs decorated class types.
"""
test_file = Path(__file__).parent / "dataclass_transform_example.py"
diagnostics = parse_pyright_output(test_file)
expected_diagnostics = {
(
"information",
'Type of "Define.__init__" is "(self: Define, a: str, b: int) -> None"',
),
(
"information",
'Type of "DefineConverter.__init__" is '
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'"(self: DefineConverter, with_converter: str | Buffer | '
'SupportsInt | SupportsIndex | SupportsTrunc) -> None"',
),
(
"error",
'Cannot assign to attribute "a" for class '
'"Frozen"\n\xa0\xa0"Frozen" is frozen\n\xa0\xa0\xa0\xa0'
'Attribute "__set__" is unknown',
),
(
"information",
'Type of "d.a" is "Literal[\'new\']"',
),
(
"error",
'Cannot assign to attribute "a" for class '
'"FrozenDefine"\n\xa0\xa0"FrozenDefine" is frozen\n\xa0\xa0\xa0\xa0'
'Attribute "__set__" is unknown',
),
(
"information",
'Type of "d2.a" is "Literal[\'new\']"',
),
(
"information",
'Type of "af.__init__" is "(_a: int) -> None"',
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),
}
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assert expected_diagnostics == diagnostics
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def test_pyright_attrsinstance_compat(tmp_path):
"""
Test that `AttrsInstance` is compatible with Pyright.
"""
test_pyright_attrsinstance_compat_path = (
tmp_path / "test_pyright_attrsinstance_compat.py"
)
test_pyright_attrsinstance_compat_path.write_text(
"""\
import attrs
# We can assign any old object to `AttrsInstance`.
foo: attrs.AttrsInstance = object()
reveal_type(attrs.AttrsInstance)
"""
)
diagnostics = parse_pyright_output(test_pyright_attrsinstance_compat_path)
expected_diagnostics = {
(
"information",
'Type of "attrs.AttrsInstance" is "type[AttrsInstance]"',
)
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}
assert diagnostics == expected_diagnostics