def test_rescue_failure():
"""Ensures that rescue works for Failure container."""
def factory(inner_value) -> RCR[int, str, int]:
return RCR.from_failure(inner_value * 2)
assert RCR.from_value(5).rescue(factory, )(0) == RCR.from_value(5)(0)
assert RCR.from_failure(5).rescue(factory, )(0) == RCR.from_failure(10)(0)
def test_lash_success():
"""Ensures that lash works for Success container."""
def factory(inner_value) -> RCR[int, str, int]:
return RCR.from_value(inner_value * 2)
assert RCR.from_value(5).lash(factory, )(0) == RCR.from_value(5)(0)
assert RCR.from_failure(5).lash(factory, )(0) == RCR.from_value(10)(0)
def test_bind_regular_context():
"""Ensures that regular ``RequiresContext`` can be bound."""
def factory(inner_value: int) -> RequiresContext[float, int]:
return RequiresContext(lambda deps: inner_value / deps)
first: RCR[int, str, int] = RCR.from_value(1)
third: RCR[int, str, int] = RCR.from_failure('a')
assert first.bind_context(factory)(2) == IOSuccess(0.5)
assert RCR.from_value(2).bind_context(factory, )(1) == IOSuccess(2.0)
assert third.bind_context(factory)(1) == IOFailure('a')
def test_bind():
"""Ensures that bind works."""
def factory(inner_value: int) -> RCR[float, str, int]:
if inner_value > 0:
return RCR(lambda deps: IOSuccess(inner_value / deps))
return RCR.from_failure(str(inner_value))
input_value = 5
bound: RCR[int, str, int] = RCR.from_value(input_value)
assert bound.bind(factory)(2) == factory(input_value)(2)
assert bound.bind(factory)(2) == IOSuccess(2.5)
assert RCR.from_value(0).bind(
factory, )(2) == factory(0)(2) == IOFailure('0')
def test_bind_ioresult():
"""Ensures that io ``Result`` can be bound."""
def factory(inner_value: int) -> IOResult[int, str]:
if inner_value > 0:
return IOSuccess(inner_value + 1)
return IOFailure('nope')
first: RCR[int, str, int] = RCR.from_value(1)
third: RCR[int, str, int] = RCR.from_failure('a')
assert first.bind_ioresult(factory)(RCR.empty) == IOSuccess(2)
assert RCR.from_value(0).bind_ioresult(factory, )(
RCR.empty) == IOFailure('nope')
assert third.bind_ioresult(factory)(RCR.empty) == IOFailure('a')
def test_rescue_with_context_ioresult():
"""Ensures that functions can be composed and return type is correct."""
rescued = rescue(_context_ioresult_function)
assert rescued(RequiresContextIOResult.from_value(1), )(1) == IOSuccess(1)
assert rescued(
RequiresContextIOResult.from_failure(1), )(1) == IOSuccess(2)
assert rescued(
RequiresContextIOResult.from_failure(0), )(1) == IOFailure('nope')
def test_requires_context_io_aliases():
"""Ensures that ReaderIOResult correctly typecast."""
container: ReaderIOResultE[int, float] = _function(1)
container2: ReaderIOResult[int, float, Exception] = _function(1)
container3: ReaderIOResultE[int,
float] = ReaderIOResultE.from_value(10.0, )
container4: ReaderIOResultE[int, float] = ReaderIOResult.from_value(10.0)
assert container(0) == container2(0) == container3(0) == container4(0)
assert container(0) == RequiresContextIOResult.from_value(10.0)(0)
def factory(inner_value) -> RCR[int, str, int]:
return RCR.from_value(inner_value * 2)
def _function(arg: int) -> RequiresContextIOResultE[int, float]:
if arg == 0:
return RequiresContextIOResult.from_failure(
ZeroDivisionError('Divided by 0'), )
return RequiresContextIOResult.from_value(10 / arg)
def test_requires_context_ioresulte():
"""Ensures that RequiresContextIOResultE correctly typecast."""
container: RequiresContextIOResult[int, float, Exception] = _function(1)
assert container(0) == RequiresContextIOResult.from_value(10.0)(0)
def test_requires_context_result_immutable_deepcopy(): # noqa: WPS118
"""Ensures that helper returns it self when passed to deepcopy function."""
requires_context = RequiresContextIOResult.from_value(1)
assert requires_context is deepcopy(requires_context)
def test_requires_context_result_immutable():
"""Ensures that container is immutable."""
with pytest.raises(ImmutableStateError):
RequiresContextIOResult.from_value(1).abc = 1
from returns.primitives.interfaces import (
Altable,
Bindable,
Fixable,
Mappable,
Rescueable,
Unitable,
Unwrapable,
)
from returns.result import Failure, Success
@pytest.mark.parametrize('container', [
RequiresContextIOResult(lambda _: IOSuccess(1)),
RequiresContextIOResult(lambda _: IOFailure(1)),
RequiresContextIOResult.from_value(1),
RequiresContextIOResult.from_failure(1),
RequiresContextIOResult.from_result(Success(1)),
RequiresContextIOResult.from_result(Failure(1)),
RequiresContextIOResult.from_ioresult(IOSuccess(1)),
RequiresContextIOResult.from_ioresult(IOFailure(1)),
ContextIOResult.ask(),
])
@pytest.mark.parametrize('protocol', [
Bindable,
Mappable,
Rescueable,
Unwrapable,
Altable,
Fixable,
Unitable,
def test_requires_context_result_immutable_copy():
"""Ensures that helper returns it self when passed to copy function."""
context_ioresult = RequiresContextIOResult.from_value(1)
assert context_ioresult is copy(context_ioresult)
def test_bind_with_context_ioresult():
"""Ensures that functions can be composed and return type is correct."""
bound = bind(_context_ioresult_function)
assert bound(RequiresContextIOResult.from_value(3))(5) == IOSuccess(8)
def test_apply_with_context_ioresult():
"""Ensures that functions can be composed and return type is correct."""
applied = apply(RequiresContextIOResult.from_value(_function))
assert applied(RequiresContextIOResult.from_value(1), )(
...) == IOSuccess('2')