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from inspect import getdoc
import pytest
from returns.curry import curry
def test_docstring():
"""Ensures that we preserve docstrings from curried function."""
@curry
def factory(arg: int, other: int) -> None:
"""Some docstring."""
assert getdoc(factory) == 'Some docstring.'
def test_immutable():
"""Check that arguments from previous calls are immutable."""
@curry
def factory(arg: int, other: int) -> tuple[int, int]:
return (arg, other)
cached = factory(arg=1)
assert cached(other=2) == (1, 2)
assert cached(other=3) == (1, 3)
def test_no_args():
"""Ensures that it is possible to curry a function with empty args."""
@curry
def factory() -> int:
return 1
assert factory() == 1
def test_one_arg():
"""Ensures that it is possible to curry a function with one arg."""
@curry
def factory(arg: int) -> int:
return arg
assert factory(1) == 1
assert factory(arg=1) == 1
with pytest.raises(TypeError):
factory(other=2) # type: ignore
with pytest.raises(TypeError):
factory(1, 2) # type: ignore
with pytest.raises(TypeError):
factory(1)(2) # type: ignore
def test_two_args():
"""Ensures that it is possible to curry a function with two args."""
@curry
def factory(arg: int, other: int) -> tuple[int, int]:
return (arg, other)
assert factory(1)(2) == (1, 2)
assert factory(1, 2) == (1, 2)
assert factory(2, other=3) == (2, 3)
assert factory(arg=2, other=3) == (2, 3)
assert factory(other=3, arg=2) == (2, 3)
assert factory(arg=0)(other=5) == (0, 5)
assert factory(0)(other=5) == (0, 5)
with pytest.raises(TypeError):
factory(1, 2, 3) # type: ignore
with pytest.raises(TypeError):
factory(1, c=2) # type: ignore
with pytest.raises(TypeError):
factory(1)(c=2) # type: ignore
with pytest.raises(TypeError):
factory(1)(2)(3) # type: ignore
def test_star_args():
"""Ensures that it is possible to curry a function with ``*args``."""
@curry
def factory(*args: int) -> int:
return sum(args)
assert factory() == 0
assert factory(1) == 1
assert factory(1, 2) == 3
assert factory(1, 2, 3) == 6
with pytest.raises(TypeError):
factory(arg=1)
with pytest.raises(TypeError):
factory(1, other=2)
with pytest.raises(TypeError):
factory(1)(2)
def test_arg_and_star_args():
"""Ensures that it is possible to curry a function with ``*args``."""
@curry
def factory(arg: int, *args: int) -> int:
return arg + sum(args)
assert factory(1) == 1
assert factory(1, 2) == 3
assert factory(1, 2, 3) == 6
with pytest.raises(TypeError):
assert factory(1)(2, 3) == 6
def test_star_kwargs():
"""Ensures that it is possible to curry a function with ``**kwargs``."""
@curry
def factory(**kwargs: int) -> list[tuple[str, int]]:
return sorted(kwargs.items())
assert not factory()
assert factory(arg=1) == [('arg', 1)]
assert factory(
arg=1,
other=2,
) == [('arg', 1), ('other', 2)]
with pytest.raises(TypeError):
factory(1)
with pytest.raises(TypeError):
factory(1, other=2)
def test_arg_star_kwargs():
"""The decorator should work with ``kwargs``."""
@curry
def factory(first: int, **kwargs: int) -> list[tuple[str, int]]:
return [('first', first), *sorted(kwargs.items())]
assert factory(1) == [('first', 1)]
assert factory(1, arg=2) == [('first', 1), ('arg', 2)]
assert factory(
first=1,
arg=2,
) == [('first', 1), ('arg', 2)]
assert factory(1, arg=2, other=3) == [
('first', 1),
('arg', 2),
('other', 3),
]
with pytest.raises(TypeError):
factory(1, 2)
with pytest.raises(TypeError):
factory(1, first=2)
with pytest.raises(TypeError):
factory(1, 2, c=2)
def test_kwonly():
"""The decorator should work with kw-only args."""
@curry
def factory(*args: int, by: int) -> tuple[int, ...]:
return (*args, by)
assert factory(
1,
2,
3,
)(by=10) == (1, 2, 3, 10)
assert factory(by=10) == (10,)
def test_raises():
"""Exception raised from the function must not be intercepted."""
@curry
def factory(arg: int, other: int) -> None:
msg = "f() missing 2 required positional arguments: 'a' and 'b'"
raise TypeError(msg)
with pytest.raises(TypeError):
factory(1)(2)
with pytest.raises(TypeError):
factory(1, 2)
with pytest.raises(TypeError):
factory(1, 2, 3) # type: ignore
|
