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from returns.maybe import Maybe, Nothing, Some
def test_bind_some():
"""Ensures that bind works correctly."""
def factory(inner_value: int) -> Maybe[int]:
return Some(inner_value * 2)
input_value = 5
bound = Some(input_value).bind(factory)
assert bound == factory(input_value)
assert str(bound) == '<Some: 10>'
def test_bind_optional():
"""Ensures that bind_optional works correctly."""
def factory(inner_value: int) -> int | None:
return inner_value or None
assert Some(1).bind_optional(factory) == Some(1)
assert Some(0).bind_optional(factory) == Nothing
assert Nothing.bind_optional(factory) == Nothing
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