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|
"""Tests for `typing.Self`."""
from dataclasses import dataclass
from typing import NamedTuple, Optional, TypedDict
from attrs import define
from typing_extensions import Self
from cattrs import Converter
from cattrs.cols import (
namedtuple_dict_structure_factory,
namedtuple_dict_unstructure_factory,
)
@define
class WithSelf:
myself: Optional[Self]
myself_with_default: Optional[Self] = None
@define
class WithSelfSubclass(WithSelf):
pass
@dataclass
class WithSelfDataclass:
myself: Optional[Self]
@dataclass
class WithSelfDataclassSubclass(WithSelfDataclass):
pass
@define
class WithListOfSelf:
myself: Optional[Self]
selves: list[WithSelf]
class WithSelfTypedDict(TypedDict):
field: int
myself: Optional[Self]
class WithSelfNamedTuple(NamedTuple):
myself: Optional[Self]
def test_self_roundtrip(genconverter):
"""A simple roundtrip works."""
initial = WithSelf(WithSelf(None, WithSelf(None)))
raw = genconverter.unstructure(initial)
assert raw == {
"myself": {
"myself": None,
"myself_with_default": {"myself": None, "myself_with_default": None},
},
"myself_with_default": None,
}
assert genconverter.structure(raw, WithSelf) == initial
def test_self_roundtrip_dataclass(genconverter):
"""A simple roundtrip works for dataclasses."""
initial = WithSelfDataclass(WithSelfDataclass(None))
raw = genconverter.unstructure(initial)
assert raw == {"myself": {"myself": None}}
assert genconverter.structure(raw, WithSelfDataclass) == initial
def test_self_roundtrip_typeddict(genconverter):
"""A simple roundtrip works for TypedDicts."""
genconverter.register_unstructure_hook(int, str)
initial: WithSelfTypedDict = {"field": 1, "myself": {"field": 2, "myself": None}}
raw = genconverter.unstructure(initial)
assert raw == {"field": "1", "myself": {"field": "2", "myself": None}}
assert genconverter.structure(raw, WithSelfTypedDict) == initial
def test_self_roundtrip_namedtuple(genconverter):
"""A simple roundtrip works for NamedTuples."""
genconverter.register_unstructure_hook_factory(
lambda t: t is WithSelfNamedTuple, namedtuple_dict_unstructure_factory
)
genconverter.register_structure_hook_factory(
lambda t: t is WithSelfNamedTuple, namedtuple_dict_structure_factory
)
initial = WithSelfNamedTuple(WithSelfNamedTuple(None))
raw = genconverter.unstructure(initial)
assert raw == {"myself": {"myself": None}}
assert genconverter.structure(raw, WithSelfNamedTuple) == initial
def test_subclass_roundtrip(genconverter):
"""A simple roundtrip works for a dataclass subclass."""
initial = WithSelfSubclass(WithSelfSubclass(None))
raw = genconverter.unstructure(initial)
assert raw == {
"myself": {"myself": None, "myself_with_default": None},
"myself_with_default": None,
}
assert genconverter.structure(raw, WithSelfSubclass) == initial
def test_subclass_roundtrip_dataclass(genconverter):
"""A simple roundtrip works for a dataclass subclass."""
initial = WithSelfDataclassSubclass(WithSelfDataclassSubclass(None))
raw = genconverter.unstructure(initial)
assert raw == {"myself": {"myself": None}}
assert genconverter.structure(raw, WithSelfDataclassSubclass) == initial
def test_nested_roundtrip(genconverter: Converter):
"""A more complex roundtrip, with several Self classes."""
initial = WithListOfSelf(WithListOfSelf(None, []), [WithSelf(WithSelf(None))])
raw = genconverter.unstructure(initial)
assert raw == {
"myself": {"myself": None, "selves": []},
"selves": [
{
"myself": {"myself": None, "myself_with_default": None},
"myself_with_default": None,
}
],
}
assert genconverter.structure(raw, WithListOfSelf) == initial
|
