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|
import pytest
from returns.io import IO, IOFailure, IOResult, IOSuccess
from returns.maybe import Maybe, Nothing, Some
from returns.result import Failure, Result, Success
@pytest.mark.parametrize(
'container',
[
Success(10),
Success(42),
Failure(RuntimeError()),
Failure(Exception()),
],
)
def test_result_pattern_matching(container: Result[int, Exception]):
"""Ensures ``Result`` containers work properly with pattern matching."""
match container:
case Success(10):
assert isinstance(container, Success)
assert container.unwrap() == 10
case Success(value):
assert isinstance(container, Success)
assert value == 42
assert container.unwrap() == value
case Failure(RuntimeError()):
assert isinstance(container, Failure)
assert isinstance(container.failure(), RuntimeError)
case Failure(_):
assert isinstance(container, Failure)
assert isinstance(container.failure(), Exception)
case _:
pytest.fail('Was not matched')
@pytest.mark.parametrize(
'container',
[
Some('SOME'),
Some('THERE IS SOME VALUE'),
Nothing,
],
)
def test_maybe_pattern_matching(container: Maybe[str]):
"""Ensures ``Maybe`` containers work properly with pattern matching."""
match container:
case Some('SOME'):
assert isinstance(container, Some)
assert container.unwrap() == 'SOME'
case Some(value):
assert isinstance(container, Some)
assert value == 'THERE IS SOME VALUE'
assert container.unwrap() == value
case Maybe.empty:
assert container is Nothing
case _:
pytest.fail('Was not matched')
@pytest.mark.parametrize(
'container',
[
IOSuccess(42.0),
IOSuccess(10.0),
IOFailure(50),
],
)
def test_ioresult_pattern_matching(container: IOResult[float, int]):
"""Ensures ``IOResult`` containers work properly with pattern matching."""
match container:
case IOSuccess(Success(42.0)):
assert isinstance(container, IOSuccess)
assert container.unwrap() == IO(42.0)
case IOSuccess(value):
assert isinstance(container, IOSuccess)
assert container.unwrap() == IO(value.unwrap())
case IOFailure(_):
assert isinstance(container, IOFailure)
assert container.failure() == IO(50)
case _:
pytest.fail('Was not matched')
|
