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from dataclasses import dataclass
from typing import List, Set, Union, Dict, Collection, Tuple, Sequence
import pytest
from dacite import from_dict, WrongTypeError, Config
def test_from_dict_with_generic_collection():
@dataclass
class X:
l: List[int]
result = from_dict(X, {"l": [1]})
assert result == X(l=[1])
def test_from_dict_with_generic_collection_of_data_classes():
@dataclass
class X:
i: int
@dataclass
class Y:
x_list: 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_generic_collection_of_unions():
@dataclass
class X:
i: int
@dataclass
class Y:
l: List[Union[int, X]]
result = from_dict(Y, {"l": [1, {"i": 2}]})
assert result == Y(l=[1, X(i=2)])
def test_from_dict_with_nested_generic_collection():
@dataclass
class X:
i: int
@dataclass
class Y:
l: List[List[X]]
result = from_dict(Y, {"l": [[{"i": 2}]]})
assert result == Y(l=[[X(i=2)]])
def test_from_dict_with_set():
@dataclass
class X:
i_set: Set[int]
result = from_dict(X, {"i_set": {1, 2}})
assert result == X(i_set={1, 2})
def test_from_dict_with_set_strings():
@dataclass
class X:
i_set: Set[str]
result = from_dict(X, {"i_set": {"a", "b"}})
assert result == X(i_set={"a", "b"})
def test_from_dict_with_cast_of_both_collection_and_inner_type():
@dataclass
class X:
set_int: Set[int]
data = {"set_int": ["1", "2"]}
result = from_dict(data_class=X, data=data, config=Config(cast=[set, int]))
assert result == X(set_int={1, 2})
def test_from_dict_with_set_of_dataclasses():
@dataclass(frozen=True)
class A:
i: int
@dataclass
class X:
set_a: Set[A]
data = {"set_a": [{"i": 1}, {"i": 2}]}
result = from_dict(data_class=X, data=data, config=Config(cast=[set]))
assert result == X(set_a={A(i=1), A(i=2)})
def test_from_dict_with_dict():
@dataclass
class X:
d: Dict[str, int]
result = from_dict(X, {"d": {"a": 1, "b": 2}})
assert result == X(d={"a": 1, "b": 2})
def test_from_dict_with_dict_of_data_classes():
@dataclass
class X:
i: int
@dataclass
class Y:
d: Dict[str, X]
result = from_dict(Y, {"d": {"a": {"i": 42}, "b": {"i": 37}}})
assert result == Y(d={"a": X(i=42), "b": X(i=37)})
def test_from_dict_with_already_created_data_class_instances():
@dataclass
class X:
i: int
@dataclass
class Y:
x: X
x_list: List[X]
result = from_dict(Y, {"x": X(i=37), "x_list": [X(i=42)]})
assert result == Y(x=X(i=37), x_list=[X(i=42)])
def test_from_dict_with_generic_abstract_collection():
@dataclass
class X:
l: Collection[int]
result = from_dict(X, {"l": [1]})
assert result == X(l=[1])
def test_from_dict_with_wrong_type_of_collection_item():
@dataclass
class X:
l: List[int]
with pytest.raises(WrongTypeError) as exception_info:
from_dict(X, {"l": ["1"]})
assert exception_info.value.field_path == "l"
assert exception_info.value.field_type == List[int]
def test_from_dict_with_wrong_type_of_dict_value():
@dataclass
class X:
d: Dict[str, int]
with pytest.raises(WrongTypeError) as exception_info:
from_dict(X, {"d": {"a": "test"}})
assert exception_info.value.field_path == "d"
assert exception_info.value.field_type == Dict[str, int]
def test_from_dict_with_dict_and_implicit_any_types():
@dataclass
class X:
d: Dict
result = from_dict(X, {"d": {"a": 1}})
assert result == X(d={"a": 1})
def test_from_dict_with_list_and_implicit_any_types():
@dataclass
class X:
l: List
result = from_dict(X, {"l": [1]})
assert result == X(l=[1])
def test_from_dict_with_tuple_of_defined_length():
@dataclass
class X:
a: int
@dataclass
class Y:
b: int
@dataclass
class Z:
t: Tuple[X, Y]
result = from_dict(Z, {"t": ({"a": 1}, {"b": 2})})
assert result == Z(t=(X(a=1), Y(b=2)))
def test_from_dict_with_tuple_of_undefined_length():
@dataclass
class X:
a: int
@dataclass
class Y:
t: Tuple[X, ...]
result = from_dict(Y, {"t": ({"a": 1}, {"a": 2})})
assert result == Y(t=(X(a=1), X(a=2)))
def test_from_dict_with_tuple_and_wrong_length():
@dataclass
class X:
a: int
@dataclass
class Y:
b: int
@dataclass
class Z:
t: Tuple[X, Y]
with pytest.raises(WrongTypeError) as exception_info:
from_dict(Z, {"t": ({"a": 1}, {"b": 2}, {"c": 3})})
assert exception_info.value.field_path == "t"
assert exception_info.value.field_type == Tuple[X, Y]
def test_from_dict_with_tuple_and_implicit_any_types():
@dataclass
class X:
t: Tuple
result = from_dict(X, {"t": (1, 2, 3)})
assert result == X(t=(1, 2, 3))
def test_from_dict_with_sequence_and_tuple():
@dataclass
class X:
s: Sequence[int]
result = from_dict(X, {"s": (1, 2, 3)})
assert result == X(s=(1, 2, 3))
def test_from_dict_with_sequence_and_empty_tuple():
@dataclass
class X:
s: Sequence[int]
result = from_dict(X, {"s": ()})
assert result == X(s=())
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