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from dataclasses import dataclass
from typing import Optional, Union, List, NewType
import pytest
from dacite import from_dict, MissingValueError, WrongTypeError
def test_from_dict_with_missing_optional_value():
@dataclass
class X:
s: Optional[str]
i: int
result = from_dict(X, {"i": 1})
assert result == X(s=None, i=1)
def test_from_dict_with_existing_optional_value():
@dataclass
class X:
s: Optional[str]
i: int
result = from_dict(X, {"s": "test", "i": 1})
assert result == X(s="test", i=1)
def test_from_dict_with_missing_optional_value_for_union():
@dataclass
class X:
i: Optional[Union[int, str]]
result = from_dict(X, {})
assert result == X(i=None)
def test_from_dict_with_none_optional_value_for_union():
@dataclass
class X:
i: Optional[Union[int, str]]
result = from_dict(X, {"i": None})
assert result == X(i=None)
def test_from_dict_with_none_as_optional_value():
@dataclass
class X:
s: Optional[str]
i: int
result = from_dict(X, {"s": None, "i": 1})
assert result == X(s=None, i=1)
def test_from_dict_with_wrong_type_of_optional_value():
@dataclass
class X:
s: Optional[str]
i: int
with pytest.raises(WrongTypeError) as exception_info:
from_dict(X, {"s": 1, "i": 1})
assert exception_info.value.field_path == "s"
assert exception_info.value.field_type == Optional[str]
def test_from_dict_with_missing_optional_nested_data_class():
@dataclass
class X:
i: int
@dataclass
class Y:
x: Optional[X]
result = from_dict(Y, {})
assert result == Y(x=None)
def test_from_dict_with_optional_nested_data_class():
@dataclass
class X:
i: int
@dataclass
class Y:
x: Optional[X]
result = from_dict(Y, {"x": {"i": 1}})
assert result == Y(x=X(i=1))
def test_from_dict_with_optional_nested_data_class_and_missing_value():
@dataclass
class X:
i: int
j: int
@dataclass
class Y:
x: Optional[X]
with pytest.raises(MissingValueError) as exception_info:
from_dict(Y, {"x": {"i": 1}})
assert exception_info.value.field_path == "x.j"
def test_from_dict_with_null_as_optional_value_for_nested_data_class():
@dataclass
class X:
i: int
@dataclass
class Y:
x: Optional[X]
result = from_dict(Y, {"x": None})
assert result == Y(x=None)
def test_from_dict_with_none_for_non_optional_field():
@dataclass
class X:
s: str
with pytest.raises(WrongTypeError) as exception_info:
from_dict(X, {"s": None})
assert exception_info.value.field_path == "s"
assert exception_info.value.field_type == str
assert exception_info.value.value is None
def test_from_dict_with_optional_generic_collection_of_data_classes():
@dataclass
class X:
i: int
@dataclass
class Y:
x_list: Optional[List[X]]
result = from_dict(Y, {"x_list": [{"i": 1}, {"i": 2}]})
assert result == Y(x_list=[X(i=1), X(i=2)])
def test_from_dict_with_optional_field_and_default_value():
@dataclass
class X:
i: Optional[int] = 1
result = from_dict(X, {})
assert result == X(i=1)
def test_from_dict_with_optional_new_type():
MyStr = NewType("MyStr", str)
@dataclass
class X:
s: Optional[MyStr]
result = from_dict(X, {"s": MyStr("test")})
assert result == X(s=MyStr("test"))
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