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# ------------------------------------------------------------------------------
# Copyright (c) 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.
# ------------------------------------------------------------------------------
import pytest
from atom.api import Atom, Value
from enaml.widgets.api import Label
from enaml.core.subscription_observer import SubscriptionObserver
def test_subscription_observer_ref():
label = Label()
observer = SubscriptionObserver(label, "text")
assert bool(observer)
assert observer.name == "text"
assert observer.ref() is label
observer.ref = None
assert not bool(observer)
def test_subscription_observer_new():
label = Label()
with pytest.raises(TypeError):
observer = SubscriptionObserver(label, 0)
with pytest.raises(TypeError):
observer = SubscriptionObserver(None, "")
def test_subscription_observer_update():
class Engine(Atom):
owner = Value()
name = Value()
def update(self, owner, name):
self.owner = owner
self.name = name
class Owner(Atom):
_d_engine = Value()
engine = Engine()
owner = Owner(_d_engine=engine)
observer = SubscriptionObserver(owner, "text")
observer()
assert engine.owner is owner
assert engine.name is "text"
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