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from copy import copy, deepcopy
import pytest
from returns.primitives.exceptions import ImmutableStateError
from returns.result import Failure, Success
def test_equals():
"""Ensures that ``.equals`` method works correctly."""
inner_value = 1
assert Success(inner_value).equals(Success(inner_value))
assert Failure(inner_value).equals(Failure(inner_value))
def test_not_equals():
"""Ensures that ``.equals`` method works correctly."""
inner_value = 1
assert not Success(inner_value).equals(Failure(inner_value))
assert not Success(inner_value).equals(Success(0))
assert not Failure(inner_value).equals(Success(inner_value))
assert not Failure(inner_value).equals(Failure(0))
def test_non_equality():
"""Ensures that containers are not compared to regular values."""
input_value = 5
assert Failure(input_value) != input_value
assert Success(input_value) != input_value
assert Failure(input_value) != Success(input_value)
assert hash(Failure(1))
assert hash(Success(1))
def test_is_compare():
"""Ensures that `is` operator works correctly."""
left = Failure(1)
right = Success(1)
assert left.bind(lambda state: state) is left
assert right.lash(lambda state: state) is right
assert right is not Success(1)
def test_immutability_failure():
"""Ensures that Failure container is immutable."""
with pytest.raises(ImmutableStateError):
Failure(0)._inner_state = 1 # noqa: SLF001
with pytest.raises(ImmutableStateError):
Failure(1).missing = 2
with pytest.raises(ImmutableStateError):
del Failure(0)._inner_state # type: ignore # noqa: SLF001, WPS420
with pytest.raises(AttributeError):
Failure(1).missing # type: ignore # noqa: B018
def test_immutability_success():
"""Ensures that Success container is immutable."""
with pytest.raises(ImmutableStateError):
Success(0)._inner_state = 1 # noqa: SLF001
with pytest.raises(ImmutableStateError):
Success(1).missing = 2
with pytest.raises(ImmutableStateError):
del Success(0)._inner_state # type: ignore # noqa: SLF001, WPS420
with pytest.raises(AttributeError):
Success(1).missing # type: ignore # noqa: B018
def test_success_immutable_copy():
"""Ensures that Success returns it self when passed to copy function."""
success = Success(1)
assert success is copy(success)
def test_success_immutable_deepcopy():
"""Ensures that Success returns it self when passed to deepcopy function."""
success = Success(1)
assert success is deepcopy(success)
def test_failure_immutable_copy():
"""Ensures that Failure returns it self when passed to copy function."""
failure = Failure(0)
assert failure is copy(failure)
def test_failure_immutable_deepcopy():
"""Ensures that Failure returns it self when passed to deepcopy function."""
failure = Failure(0)
assert failure is deepcopy(failure)
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