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from dataclasses import dataclass
from typing import Optional, List, Union, Dict
import pytest
from dacite import from_dict, UnionMatchError
def test_from_dict_with_union_of_builtin_types():
@dataclass
class X:
i: Union[int, str]
result = from_dict(X, {"i": "s"})
assert result == X(i="s")
def test_from_dict_with_union_of_data_classes():
@dataclass
class X:
i: int
@dataclass
class Y:
s: str
@dataclass
class Z:
x_or_y: Union[X, Y]
result = from_dict(Z, {"x_or_y": {"s": "test"}})
assert result == Z(x_or_y=Y(s="test"))
def test_from_dict_with_union_and_wrong_data():
@dataclass
class X:
i: Union[int, str]
with pytest.raises(UnionMatchError) as exception_info:
from_dict(X, {"i": 1.0})
assert str(exception_info.value) == f'can not match type "float" to any type of "i" union: {Union[int, str]}'
assert exception_info.value.field_path == "i"
assert exception_info.value.field_type == Union[int, str]
assert exception_info.value.value == 1.0
def test_from_dict_with_union_of_data_classes_and_wrong_data():
@dataclass
class X:
i: int
@dataclass
class Y:
s: str
@dataclass
class Z:
x_or_y: Union[X, Y]
with pytest.raises(UnionMatchError) as exception_info:
from_dict(Z, {"x_or_y": {"f": 2.0}})
assert exception_info.value.field_path == "x_or_y"
assert exception_info.value.field_type == Union[X, Y]
assert exception_info.value.value == {"f": 2.0}
def test_from_dict_with_union_of_generic_collecionts_of_data_classes():
@dataclass
class X:
i: int
@dataclass
class Y:
s: str
@dataclass
class Z:
x_or_y: Union[List[X], List[Y]]
result = from_dict(Z, {"x_or_y": [{"s": "test"}]})
assert result == Z(x_or_y=[Y(s="test")])
def test_from_dict_with_union_and_optional():
@dataclass
class X:
i: Union[int, Optional[str]]
result = from_dict(X, {"i": "s"})
assert result == X(i="s")
def test_from_dict_with_union_and_optional_and_missing_value():
@dataclass
class X:
i: Union[int, Optional[str]]
result = from_dict(X, {})
assert result == X(i=None)
def test_from_dict_with_union_and_optional_and_none_value():
@dataclass
class X:
i: Union[int, Optional[str]]
result = from_dict(X, {"i": None})
assert result == X(i=None)
def test_from_dict_with_union_and_optional_and_wrong_value():
@dataclass
class X:
i: Union[int, Optional[str]]
with pytest.raises(UnionMatchError) as exception_info:
from_dict(X, {"i": 1.0})
assert exception_info.value.field_path == "i"
assert exception_info.value.field_type == Union[int, str, None]
assert exception_info.value.value == 1.0
def test_from_dict_with_union_of_mixed_types_and_builtin_type_as_a_result():
@dataclass
class X:
i: int
@dataclass
class Y:
u: Union[X, List[X], str]
result = from_dict(Y, {"u": "test"})
assert result == Y(u="test")
def test_from_dict_with_union_of_mixed_types_and_data_class_as_a_result():
@dataclass
class X:
i: int
@dataclass
class Y:
u: Union[str, List[X], X]
result = from_dict(Y, {"u": {"i": 1}})
assert result == Y(u=X(i=1))
def test_from_dict_with_union_of_mixed_types_and_collection_of_data_classes_as_a_result():
@dataclass
class X:
i: int
@dataclass
class Y:
u: Union[str, X, List[X]]
result = from_dict(Y, {"u": [{"i": 1}]})
assert result == Y(u=[X(i=1)])
def test_from_dict_with_union_of_mixed_types_and_dict_of_data_classes_as_a_result():
@dataclass
class X:
i: int
@dataclass
class Y:
d: Union[int, List[X], Dict[str, X]]
result = from_dict(Y, {"d": {"x": {"i": 42}, "z": {"i": 37}}})
assert result == Y(d={"x": X(i=42), "z": X(i=37)})
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