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# typedload
# Copyright (C) 2019-2022 Salvo "LtWorf" Tomaselli
#
# typedload is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# author Salvo "LtWorf" Tomaselli <tiposchi@tiscali.it>
from dataclasses import dataclass
from typing import Literal, NamedTuple, TypedDict, Union
import unittest
from typedload import dataloader, load, dump, typechecks
class TestLiteralLoad(unittest.TestCase):
def test_literalvalues(self):
assert isinstance(typechecks.literalvalues(Literal[1]), set)
assert typechecks.literalvalues(Literal[1]) == {1}
assert typechecks.literalvalues(Literal[1, 1]) == {1}
assert typechecks.literalvalues(Literal[1, 2]) == {1, 2}
def test_load(self):
l = Literal[1, 2, 'a']
assert load(1, l) == 1
assert load(2, l) == 2
assert load('a', l) == 'a'
def test_fail(self):
l = Literal[1, 2, 'a']
with self.assertRaises(ValueError):
load(3, l)
def test_discriminatorliterals_wrong(self):
assert typechecks.discriminatorliterals(int) == {}
def test_discriminatorliterals_namedtuple(self):
class A(NamedTuple):
t: Literal['a', 'b']
i: int
q: str
class B(NamedTuple):
t: Literal[33]
q: Literal[12]
i: int
class C(NamedTuple):
t: Literal['a']
i: int
assert typechecks.discriminatorliterals(A) == {'t': {'a', 'b'}}
assert typechecks.discriminatorliterals(B) == {'t': {33,}, 'q': {12,}}
assert typechecks.discriminatorliterals(C) == {'t': {'a', }}
def test_discriminatorliterals_typeddict(self):
class A(TypedDict):
t: Literal['a', 'b']
i: int
q: str
class B(TypedDict):
t: Literal[33]
q: Literal[12]
i: int
class C(TypedDict):
t: Literal['a']
i: int
assert typechecks.discriminatorliterals(A) == {'t': {'a', 'b'}}
assert typechecks.discriminatorliterals(B) == {'t': {33,}, 'q': {12,}}
assert typechecks.discriminatorliterals(C) == {'t': {'a', }}
def test_discriminatorliterals_dataclass(self):
@dataclass
class A:
t: Literal['a', 'b']
i: int
q: str
@dataclass
class B:
t: Literal[33]
q: Literal[12]
i: int
@dataclass
class C:
t: Literal['a']
i: int
assert typechecks.discriminatorliterals(A) == {'t': {'a', 'b'}}
assert typechecks.discriminatorliterals(B) == {'t': {33,}, 'q': {12,}}
assert typechecks.discriminatorliterals(C) == {'t': {'a', }}
def test_discriminatorliterals_attr(self):
try:
from attr import attrs, attrib
except ImportError:
return
@attrs
class A:
t: Literal['a', 'b'] = attrib()
i: int = attrib()
q: str = attrib()
@attrs
class B:
t: Literal[33] = attrib()
q: Literal[12] = attrib()
i: int = attrib()
@attrs
class C:
t: Literal['a'] = attrib()
i: int = attrib()
assert typechecks.discriminatorliterals(A) == {'t': {'a', 'b'}}
assert typechecks.discriminatorliterals(B) == {'t': {33,}, 'q': {12,}}
assert typechecks.discriminatorliterals(C) == {'t': {'a', }}
def test_literal_sorting(self):
class A(NamedTuple):
t: Literal[1]
i: int
class B(NamedTuple):
t: Literal[2, 3]
i: int
assert load({'t': 1, 'i': 12}, Union[A, B]) == A(1, 12)
assert load({'t': 2, 'i': 12}, Union[A, B]) == B(2, 12)
assert load({'t': 3, 'i': 12}, Union[A, B]) == B(3, 12)
def test_multiple_literal_sorting(self):
class A(NamedTuple):
t: Literal[1]
u: Literal[1]
class B(NamedTuple):
t: Literal[2]
i: int
assert load({'t': 1, 'u': 1}, Union[A, B]) == A(1, 1)
assert load({'t': 2, 'i': 12}, Union[A, B]) == B(2, 12)
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