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import dataclasses
from typing import List
import attr
import pytest
from cattrs import BaseConverter
from ._compat import is_py310_plus
@dataclasses.dataclass
class Foo:
bar: str
@attr.define
class Container:
foos: List[Foo]
def test_dataclasses_in_attrs(converter: BaseConverter):
struct = Container([Foo("bar")])
unstruct = {"foos": [{"bar": "bar"}]}
assert converter.unstructure(struct) == unstruct
assert converter.structure(unstruct, Container) == struct
def test_dataclasses_in_container(converter: BaseConverter):
struct = [Foo("bar"), Foo("bat")]
unstruct = [{"bar": "bar"}, {"bar": "bat"}]
assert converter.unstructure(struct) == unstruct
assert converter.structure(unstruct, List[Foo]) == struct
def test_dataclasses(converter: BaseConverter):
struct = Foo("bar")
unstruct = {"bar": "bar"}
assert converter.unstructure(struct) == unstruct
assert converter.structure(unstruct, Foo) == struct
@pytest.mark.skipif(not is_py310_plus, reason="kwonly fields are Python 3.10+")
def test_kw_only_propagation(converter: BaseConverter):
"""KW-only args work.
Reproducer from https://github.com/python-attrs/cattrs/issues/637.
"""
@dataclasses.dataclass
class PartialKeywords:
a1: str = "Default"
a2: str = dataclasses.field(kw_only=True)
assert converter.structure({"a2": "Value"}, PartialKeywords) == PartialKeywords(
a1="Default", a2="Value"
)
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