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# --------------------------------------------------------------------------------------
# Copyright (c) 2018-2024, 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 notification mechanisms."""
import gc
import operator
import sys
from collections import Counter
import pytest
from atom.api import Atom, Event, Int
def test_eventbinder_lifecycle():
"""Test creating and destroying an event binder.
We create enough event binder to exceed the freelist length and fully
deallocate some.
"""
class EventAtom(Atom):
e = Event()
event_binders = [EventAtom.e for i in range(512)]
for i, e in enumerate(event_binders):
event_binders[i] = None
del e
gc.collect()
atom = EventAtom()
eb = atom.e
referents = [EventAtom.e, atom, type(eb)]
assert Counter(gc.get_referents(eb)) == Counter(referents)
def test_eventbinder_call():
"""Test calling an event binder and handling bad arguments."""
class EventAtom(Atom):
counter = Int()
e = Event()
a = EventAtom()
def update_counter(change):
change["object"].counter += change["value"]
a.observe("e", update_counter)
a.e(2)
assert a.counter == 2
with pytest.raises(TypeError) as excinfo:
a.e(k=1)
assert "keyword arguments" in excinfo.exconly()
with pytest.raises(TypeError) as excinfo:
a.e(1, 2, 3)
assert "at most 1 argument" in excinfo.exconly()
def test_eventbinder_cmp():
"""Test comparing event binders."""
class EventAtom(Atom):
e1 = Event()
e2 = Event()
a = EventAtom()
assert a.e1 == a.e1
assert not a.e1 == a.e2
assert not a.e1 == 1
if sys.version_info >= (3,):
for op in ("lt", "le", "gt", "ge"):
with pytest.raises(TypeError):
getattr(operator, op)(a.e1, 1)
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