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from copy import copy, deepcopy
import pytest
from returns.maybe import Nothing, Some, _Nothing # noqa: PLC2701
from returns.primitives.exceptions import ImmutableStateError
def test_equals():
"""Ensures that ``.equals`` method works correctly."""
inner_value = 1
assert Some(inner_value).equals(Some(inner_value))
assert Nothing.equals(Nothing)
def test_not_equals():
"""Ensures that ``.equals`` method works correctly."""
assert not Some(1).equals(Nothing)
assert not Some(1).equals(Some(0))
assert not Nothing.equals(Some(1))
def test_equality():
"""Ensures that containers can be compared."""
assert Nothing is Nothing # noqa: PLR0124, WPS312
assert Nothing == _Nothing() == _Nothing(None)
assert Some(5) == Some(5)
assert hash(Some(1))
assert hash(Nothing)
def test_nonequality():
"""Ensures that containers are not compared to regular values."""
assert Nothing is not None
assert Nothing != None # noqa: E711
assert _Nothing(None) != None # noqa: E711
assert Some(5) != 5
assert Some(3) is not Some(3)
def test_is_compare():
"""Ensures that `is` operator works correctly."""
some_container = Some(1)
assert Nothing.bind(lambda state: state) is Nothing
assert some_container is not Some(1)
def test_immutability_failure():
"""Ensures that Failure container is immutable."""
with pytest.raises(ImmutableStateError):
Nothing._inner_state = 1 # noqa: SLF001
with pytest.raises(ImmutableStateError):
Nothing.missing = 2
with pytest.raises(ImmutableStateError):
del Nothing._inner_state # type: ignore # noqa: SLF001, WPS420
with pytest.raises(AttributeError):
Nothing.missing # type: ignore # noqa: B018
def test_immutability_success():
"""Ensures that Success container is immutable."""
with pytest.raises(ImmutableStateError):
Some(0)._inner_state = 1 # noqa: SLF001
with pytest.raises(ImmutableStateError):
Some(1).missing = 2
with pytest.raises(ImmutableStateError):
del Some(0)._inner_state # type: ignore # noqa: SLF001, WPS420
with pytest.raises(AttributeError):
Some(1).missing # type: ignore # noqa: B018
def test_success_immutable_copy():
"""Ensures that Success returns it self when passed to copy function."""
some = Some(1) # noqa: WPS110
assert some is copy(some)
def test_success_immutable_deepcopy():
"""Ensures that Success returns it self when passed to deepcopy function."""
some = Some(1) # noqa: WPS110
assert some is deepcopy(some)
def test_failure_immutable_copy():
"""Ensures that Failure returns it self when passed to copy function."""
nothing = _Nothing()
assert nothing is copy(nothing)
def test_failure_immutable_deepcopy():
"""Ensures that Failure returns it self when passed to deepcopy function."""
nothing = _Nothing()
assert nothing is deepcopy(nothing)
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