1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
|
"""Tests for PEP 695 (Type Parameter Syntax)."""
from dataclasses import dataclass
import pytest
from attrs import define
from cattrs import BaseConverter, Converter
from ._compat import is_py312_plus
@pytest.mark.skipif(not is_py312_plus, reason="3.12+ syntax")
def test_simple_generic_roundtrip(converter: BaseConverter):
"""PEP 695 attrs generics work."""
@define
class A[T]:
a: T
assert converter.structure({"a": "1"}, A[int]) == A(1)
assert converter.unstructure(A(1)) == {"a": 1}
if isinstance(converter, Converter):
# Only supported on a Converter
assert converter.unstructure(A(1), A[int]) == {"a": 1}
@pytest.mark.skipif(not is_py312_plus, reason="3.12+ syntax")
def test_simple_generic_roundtrip_dc(converter: BaseConverter):
"""PEP 695 dataclass generics work."""
@dataclass
class A[T]:
a: T
assert converter.structure({"a": "1"}, A[int]) == A(1)
assert converter.unstructure(A(1)) == {"a": 1}
if isinstance(converter, Converter):
# Only supported on a Converter
assert converter.unstructure(A(1), A[int]) == {"a": 1}
def test_type_aliases(converter: BaseConverter):
"""PEP 695 type aliases work."""
type my_int = int
assert converter.structure("42", my_int) == 42
assert converter.unstructure(42, my_int) == 42
type my_other_int = int
# Manual hooks should work.
converter.register_structure_hook_func(
lambda t: t is my_other_int, lambda v, _: v + 10
)
converter.register_unstructure_hook_func(
lambda t: t is my_other_int, lambda v: v - 20
)
assert converter.structure(1, my_other_int) == 11
assert converter.unstructure(100, my_other_int) == 80
def test_type_aliases_simple_hooks(converter: BaseConverter):
"""PEP 695 type aliases work with `register_un/structure_hook`."""
type my_other_int = int
converter.register_structure_hook(my_other_int, lambda v, _: v + 10)
converter.register_unstructure_hook(my_other_int, lambda v: v - 20)
assert converter.structure(1, my_other_int) == 11
assert converter.unstructure(100, my_other_int) == 80
def test_type_aliases_overwrite_base_hooks(converter: BaseConverter):
"""Overwriting base hooks should affect type aliases."""
converter.register_structure_hook(int, lambda v, _: v + 10)
converter.register_unstructure_hook(int, lambda v: v - 20)
type my_int = int
assert converter.structure(1, my_int) == 11
assert converter.unstructure(100, my_int) == 80
def test_type_alias_with_children(converter: BaseConverter):
"""A type alias that chains to a hook that requires the type parameter works."""
class TestClass:
pass
def structure_testclass(val, type):
assert type is TestClass
return TestClass
converter.register_structure_hook(TestClass, structure_testclass)
type TestAlias = TestClass
assert converter.structure(None, TestAlias) is TestClass
def test_generic_type_alias(converter: BaseConverter):
"""Generic type aliases work.
See https://docs.python.org/3/reference/compound_stmts.html#generic-type-aliases
for details.
"""
type Gen1[T] = T
assert converter.structure("1", Gen1[int]) == 1
type Gen2[K, V] = dict[K, V]
assert converter.structure({"a": "1"}, Gen2[str, int]) == {"a": 1}
|
