(Some(Some([])), Some([])),
# Nope:
(Failure(Failure('a')), Failure(Failure('a'))),
(IOFailure(IOFailure('a')), IOFailure(IOFailure('a'))),
])
def test_flatten(container, merged):
"""Ensures that `flatten` is always returning the correct type."""
assert flatten(container) == merged
@pytest.mark.parametrize(('container', 'merged'), [
(
RequiresContextResult.from_success(
RequiresContextResult.from_success(1), ),
RequiresContextResult.from_success(1),
),
(
RequiresContextIOResult.from_success(
RequiresContextIOResult.from_success(1), ),
RequiresContextIOResult.from_success(1),
),
(
RequiresContext.from_value(RequiresContext.from_value(1)),
RequiresContext.from_value(1),
),
])
def test_flatten_context(container, merged):
"""Ensures that `flatten` is always returning the correct type."""
assert flatten(container)(...) == merged(...)
def test_requires_context_from_value():
"""Ensures that ``from_value`` method works correctly."""
assert RequiresContext.from_value(1)(RequiresContext.empty) == 1
assert RequiresContext.from_value(2)(1) == 2
def test_nonequality():
"""Ensures that containers can be compared."""
assert RequiresContext(_same_function) != RequiresContext(str)
assert RequiresContext.from_value(1) != RequiresContext.from_value(1)
def test_apply_with_context():
"""Ensures that functions can be composed and return type is correct."""
applied = apply(RequiresContext.from_value(_function))
assert applied(RequiresContext.from_value(1))(...) == '2'
def test_requires_context_immutable():
"""Ensures that Context is immutable."""
with pytest.raises(ImmutableStateError):
RequiresContext.from_value(1).abc = 1
def test_requires_context_immutable_deepcopy():
"""Ensures that Context returns it self when passed to deepcopy function."""
context = RequiresContext.from_value(1)
assert context is deepcopy(context)