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import pytest
from returns.io import IOFailure, IOSuccess
from returns.maybe import Nothing, Some
from returns.pipeline import is_successful
from returns.result import Failure, Success
@pytest.mark.parametrize(
('container', 'correct_result'),
[
(Success('a'), True),
(Failure('a'), False),
(IOSuccess('a'), True),
(IOFailure('a'), False),
(Some('a'), True),
(Some(None), True),
(Nothing, False),
],
)
def test_is_successful(container, correct_result):
"""Ensures that successful state works correctly."""
assert is_successful(container) is correct_result
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