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# --------------------------------------------------------------------------------------
# Copyright (c) 2013-2025, Nucleic Development Team.
#
# Distributed under the terms of the Modified BSD License.
#
# The full license is in the file LICENSE, distributed with this software.
# --------------------------------------------------------------------------------------
"""Test the del behaviors
no_op_handler: not sure it is used
slot_handler: behavior leading to calling the default factory on next get
constant_handler
read_only_handler
event_handler
signal_handler
delegate_handler: not tested here (see test_delegate.py)
property_handler: not tested here (see test_property.py)
"""
import pytest
from atom.api import Atom, Constant, Event, Int, Member, ReadOnly, Signal
from atom.catom import DelAttr
def test_del_noop():
"""Test the noop handler."""
member = Member()
member.set_delattr_mode(DelAttr.NoOp, None)
class A(Atom):
m = member
assert A.m.delattr_mode[0] == DelAttr.NoOp
a = A()
a.m = 1
del a.m
assert a.m == 1
assert A.m.do_delattr(a) is None
assert a.m == 1
@pytest.mark.parametrize(
"member, mode",
[
(Event(), DelAttr.Event),
(Signal(), DelAttr.Signal),
(ReadOnly(), DelAttr.ReadOnly),
(Constant(1), DelAttr.Constant),
],
)
def test_undeletable(member, mode):
"""Test that unsettable members do raise the proper error."""
class Undeletable(Atom):
m = member
assert Undeletable.m.delattr_mode[0] == mode
u = Undeletable()
with pytest.raises(TypeError):
del u.m
with pytest.raises(TypeError):
Undeletable.m.do_delattr(u)
def test_del_slot():
"""Test deleting a member using the slot handler."""
class DelSlot(Atom):
i = Int(10)
a = DelSlot()
assert a.i == 10
# Using del statement
a.i = 0
del a.i
assert a.i == 10
# Using the member do_delattr
a.i = 0
DelSlot.i.do_delattr(a)
assert a.i == 10
# Test deleting an improperly indexed slot
DelSlot.i.set_index(DelSlot.i.index + 1)
with pytest.raises(AttributeError):
DelSlot.i.do_delattr(a)
|
