def test_from_json_obj_wrong_type():
""" Test `to_json_obj` on wrong encodings for JSON base types and `decimal.Decimal`. """
for t, encoding in WRONG_TYPE_ENCODINGS:
try:
from_json_obj(encoding, t)
assert False, "Should not be decoding %s as %s." % (str(encoding),
str(t))
except TypeError:
assert True
def test_from_json_obj_large_collections_namedtuple():
class Pair(NamedTuple):
left: int
right: int
large_list: List[Pair] = []
for i in range(1000):
large_list.append(Pair(i, i + 1))
assert from_json_obj(
to_json_obj(large_list, List[Pair], namedtuples_as_lists=False),
List[Pair]) == large_list
assert from_json_obj(
to_json_obj(large_list, List[Pair], namedtuples_as_lists=True),
List[Pair]) == large_list
def test_from_json_obj_lists():
""" Checks that lists are decoded correctly. """
encoding = [1, 2, 3]
val = from_json_obj(encoding, List[int])
assert isinstance(val, list)
assert len(val) == 3
assert all(val[i] == encoding[i] for i in range(len(encoding)))
def test_from_json_obj_deque():
""" Checks that dequeues are decoded correctly. """
encoding = [1, 2, 3]
val = from_json_obj(encoding, Deque[int])
assert isinstance(val, deque)
assert len(val) == 3
assert all(val[i] == encoding[i] for i in range(len(encoding)))
def test_from_json_obj_tuples2():
""" Checks that variadic tuples are decoded correctly. """
encoding = [1, 2, 3]
val = from_json_obj(encoding, Tuple[int, ...])
assert isinstance(val, tuple)
assert len(val) == 3
assert all(val[i] == encoding[i] for i in range(len(encoding)))
def test_from_json_obj_typeerrors():
""" Checks that `from_json_obj` raises `TypeError` on non-typecheckable types or non-json-encodable types.
"""
class NonTypechekableT:
name: str
val: int
def __init__(self, name, val):
self.name = name
self.val = val
x = NonTypechekableT("x", 0)
try:
from_json_obj(x, NonTypechekableT)
assert False
except TypeError:
assert True
def test_from_json_obj_ordereddicts():
""" Checks that dicts are decoded into dicts with the correct key/value pairs. """
def _assert_eq_ordered_dicts(d1, d2):
assert isinstance(d1, OrderedDict)
assert isinstance(d2, OrderedDict)
assert len(d1) == len(d2)
assert tuple(d1.keys()) == tuple(d2.keys())
assert all(d1[key] == d2[key] for key in d1)
for val, t, encoding in ORDERED_DICT_ENCODINGS:
_assert_eq_ordered_dicts(from_json_obj(encoding, t), val)
def test_is_json_encodable_namedtuple():
"""
Tests the encoding of namedtuples.
"""
t = NamedTupleExampleT("t", 1)
t_encoding = OrderedDict([("name", "t"), ("value", 1)])
assert from_json_obj(t_encoding, NamedTupleExampleT) == t
nt = NamedTupleNastyExampleT("t", {"x": 1.0, "y": 0.0})
nt_encoding_list = ["t", {"x": Decimal("1.0"), "y": 0}]
assert from_json_obj(nt_encoding_list, NamedTupleNastyExampleT) == nt
nt_encoding_list_long = ["t", {"x": Decimal("1.0"), "y": 0}, False]
assert from_json_obj(nt_encoding_list_long, NamedTupleNastyExampleT) == nt
try:
nt_encoding_list_too_long = [
"t", {
"x": Decimal("1.0"),
"y": 0
}, False, 1
]
from_json_obj(nt_encoding_list_too_long, NamedTupleNastyExampleT) == nt
except TypeError:
assert True
def test_from_json_obj_numbers():
assert from_json_obj(1.5, Decimal) == Decimal(1.5)
assert from_json_obj(1, float) == 1.0
assert from_json_obj(Decimal("1.5"), float) == 1.5
assert from_json_obj(Decimal("1.0"), float) == 1.0
try:
from_json_obj(Decimal("1.5"), float, cast_decimal=False)
assert False
except TypeError:
assert True
def test_from_json_typed_dict():
class Pair(TypedDict, total=True):
left: int
right: int
assert from_json_obj({
"left": 0,
"right": 1
}, Pair) == {
"left": 0,
"right": 1
}
try:
from_json_obj("not a dict", Pair)
assert False, "Should not be decoding string as TypedDict."
except TypeError:
assert True
try:
from_json_obj({"left": 0}, Pair)
assert False, "Should not be decoding dict with missing key as TypedDict (total=True)."
except TypeError:
assert True
try:
from_json_obj({"left": 0, "right": 1, "center": 2}, Pair)
assert False, "Should not be decoding dict with extra key as TypedDict (total=True)."
except TypeError:
assert True
class PartialPair(TypedDict, total=False):
left: int
right: int
try:
from_json_obj({"left": 0}, PartialPair)
assert True, "Should be decoding dict with missing key as TypedDict (total=False)."
except TypeError:
assert False
def loads(s: str,
decoded_type: Type,
cast_decimal: bool = True,
cls=None,
parse_float=Decimal,
parse_int=None,
parse_constant=None,
**kw) -> Any:
# pylint: disable = too-many-arguments
"""
Calls `json.load`, then decodes `obj` from the resulting JSON object using `decoded_type` as a type hint.
Raises `TypeError` is `decoded_type` is not JSON-encodable according to `typing_json.encoding.is_json_encodable`.
"""
if not is_json_encodable(decoded_type):
raise TypeError("Type %s is not json-encodable." % str(decoded_type))
obj = json.loads(s,
cls=cls,
parse_float=parse_float,
parse_int=parse_int,
parse_constant=parse_constant,
object_pairs_hook=collections.OrderedDict,
**kw)
return from_json_obj(obj, decoded_type, cast_decimal=cast_decimal)
def test_from_json_obj_enums():
assert from_json_obj("Red", EnumT) == EnumT.Red
def test_from_json_obj_basetypes():
""" Test `to_json_obj` on JSON base types and `decimal.Decimal`. """
for val, t, encoding in BASETYPES_ENCODINGS:
assert from_json_obj(encoding, t) == val
def test_from_json_obj_frozenset():
""" Checks that dequeues are decoded correctly. """
encoding = [1, 2, 3]
val = from_json_obj(encoding, FrozenSet[int])
assert isinstance(val, frozenset)
assert set(val) == set(encoding)
def test_from_json_obj_errors():
# pylint:disable=too-many-branches, too-many-statements
try:
from_json_obj(1.0j, complex)
assert False
except TypeError:
assert True
try:
from_json_obj("hi", int)
assert False
except TypeError:
assert True
try:
from_json_obj(1.0, None)
assert False
except TypeError:
assert True
try:
from_json_obj(1.0, type(None))
assert False
except TypeError:
assert True
try:
from_json_obj(1.0, ...)
assert False
except TypeError:
assert True
class A(NamedTuple):
name: str
value: int
try:
from_json_obj(1.0, A)
assert False
except TypeError:
assert True
try:
from_json_obj([1.0], A)
assert False
except TypeError:
assert True
try:
from_json_obj({"name": "hi"}, A)
assert False
except TypeError:
assert True
try:
from_json_obj({"name": "hi", "value": 0, "extra": None}, A)
assert False
except TypeError:
assert True
try:
from_json_obj("hi", Union[int, float, bool])
assert False
except TypeError:
assert True
try:
from_json_obj("hi", List[str])
assert False
except TypeError:
assert True
try:
from_json_obj("hi", Deque[str])
assert False
except TypeError:
assert True
try:
from_json_obj("hi", Set[str])
assert False
except TypeError:
assert True
try:
from_json_obj("hi", FrozenSet[str])
assert False
except TypeError:
assert True
try:
from_json_obj("hi", Tuple[str, ...])
assert False
except TypeError:
assert True
try:
from_json_obj("hi", Tuple[str, int])
assert False
except TypeError:
assert True
try:
from_json_obj("hi", Literal[0, 1])
assert False
except TypeError:
assert True
try:
from_json_obj(["hi"], Tuple[str, int])
assert False
except TypeError:
assert True
try:
from_json_obj("hi", Dict[str, str])
assert False
except TypeError:
assert True
try:
from_json_obj({0: "hi"}, Dict[str, str])
assert False
except TypeError:
assert True
try:
from_json_obj("hi", typing.OrderedDict[str, str])
assert False
except TypeError:
assert True
try:
from_json_obj(collections.OrderedDict({0: "hi"}),
typing.OrderedDict[str, str])
assert False
except TypeError:
assert True
try:
from_json_obj({"name": "hi"}, typing.OrderedDict[str, str])
assert False
except TypeError:
assert True
def test_from_json_obj():
# pylint:disable=missing-docstring,invalid-name
for t in BASE_TYPES:
obj = BASE_TYPES[t]
if t is ...:
assert from_json_obj(to_json_obj(obj, t), t) is ...
else:
assert from_json_obj(to_json_obj(obj, t), t) is obj
assert from_json_obj(to_json_obj(None, None), None) is None
class A(NamedTuple):
name: str
value: int
a = A("hi", 0)
# pylint:disable=line-too-long
assert from_json_obj(to_json_obj(a, A), A) == a
assert from_json_obj(["hi", 0], A) == a
a._field_defaults["value"] = 0 # type:ignore #pylint:disable=no-member,protected-access
assert from_json_obj({"name": "hi"}, A) == a
assert from_json_obj(to_json_obj(1, Union[int, float]), Union[int,
float]) == 1
assert from_json_obj(to_json_obj(1.0, Union[int, float]),
Union[int, float]) == 1.0
assert from_json_obj(to_json_obj("hi", Literal["hi", 1]),
Literal["hi", 1]) == "hi"
assert from_json_obj(to_json_obj(1, Literal["hi", 1]), Literal["hi",
1]) == 1
assert from_json_obj(to_json_obj(["hi", "my"], List[str]),
List[str]) == ["hi", "my"]
assert from_json_obj(to_json_obj(set(["hi", "my"]), Set[str]),
Set[str]) == set(["hi", "my"])
assert from_json_obj(to_json_obj(deque(["hi", "my"]), Deque[str]),
Deque[str]) == deque(["hi", "my"])
assert from_json_obj(to_json_obj(frozenset(["hi", "my"]), FrozenSet[str]),
FrozenSet[str]) == frozenset(["hi", "my"])
assert from_json_obj(to_json_obj(tuple(["hi", "my"]), Tuple[str, ...]),
Tuple[str, ...]) == tuple(["hi", "my"])
assert from_json_obj(to_json_obj(tuple(["hi", 0]), Tuple[str, int]),
Tuple[str, int]) == tuple(["hi", 0])
d = {"name": "hi", "value": "zero"}
assert from_json_obj(to_json_obj(d, Dict[str, str]), Dict[str, str]) == d
od = collections.OrderedDict(d)
assert from_json_obj(to_json_obj(od, typing.OrderedDict[str, str]),
typing.OrderedDict[str, str]) == od
