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#------------------------------------------------------------------------------
# Copyright (c) 2020-2024, Nucleic Development Team.
#
# Distributed under the terms of the Modified BSD License.
#
# The full license is in the file LICENSE, distributed with this software.
#------------------------------------------------------------------------------
import gc
import pytest
from enaml.signaling import Signal, BoundSignal
class SignalTester:
signal = Signal()
def __init__(self):
self.counter = 0
self.last_args = None
self.last_kwargs = None
def slot(self, *args, **kwargs):
self.counter += 1
self.last_args = args
self.last_kwargs = kwargs
def test_signal_bound_method():
"""Test creating, connecting, emitting and disconnecting a signal.
"""
s = SignalTester()
bs1 = s.signal
bs2 = s.signal
assert bs1 is not bs2
assert isinstance(bs1, BoundSignal)
s.signal.connect(s.slot)
bs1.connect(s.slot)
bs2.connect(s.slot)
s.signal.emit(1, 2, 3)
assert s.counter == 3
assert s.last_args == (1, 2, 3)
assert s.last_kwargs == {}
s.signal.disconnect(s.slot)
s.signal(4, 5, c=5, h=6)
assert s.counter == 5
assert s.last_args == (4, 5)
assert s.last_kwargs == dict(c=5, h=6)
s.signal.disconnect(s.slot)
s.signal(a=1)
assert s.counter == 6
assert s.last_args == ()
assert s.last_kwargs == dict(a=1)
s.signal.disconnect(s.slot)
s.signal()
assert s.counter == 6
def test_signal_disconnect_all():
"""Test disconnecting all slots connected the bound signals.
"""
c = 0
last_args = ()
last_kwargs = {}
def dummy_slot(*args, **kwargs):
nonlocal c, last_args, last_kwargs
c += 1
last_args = args
last_kwargs = kwargs
s = SignalTester()
s.signal.connect(s.slot)
s.signal(4, 5, c=5, h=6)
assert s.counter == 1
s.signal.connect(dummy_slot)
s.signal.emit()
assert s.counter == 2
assert c == 1
assert last_args == ()
assert last_kwargs == dict()
s.signal.emit(1, 2)
assert s.counter == 3
assert c == 2
assert last_args == (1, 2)
assert last_kwargs == dict()
s.signal.emit(a=1)
assert s.counter == 4
assert c == 3
assert last_args == ()
assert last_kwargs == dict(a=1)
s.signal.emit(1, a=1)
assert s.counter == 5
assert c == 4
assert last_args == (1,)
assert last_kwargs == dict(a=1)
SignalTester.signal.disconnect_all(s)
s.signal.emit()
assert s.counter == 5
assert c == 4
def test_signal_bad_creation():
"""Test handling bad arguments to Signal.
"""
with pytest.raises(TypeError):
Signal(1)
with pytest.raises(TypeError):
Signal(a=1)
def test_signal_set_del():
"""Test setting/deleting a signal
"""
s = SignalTester()
with pytest.raises(AttributeError):
s.signal = 1
s = SignalTester()
s.signal.connect(s.slot)
s.signal(4, 5, c=5, h=6)
assert s.counter == 1
del s.signal
s.signal.emit()
assert s.counter == 1
def test_bound_signal_comparison():
"""Test comparing different bound signals.
"""
s = SignalTester()
assert s.signal == s.signal
def test_manual_bound_signal_creation():
"""Test creating manually a BoundSignal.
"""
s = SignalTester()
with pytest.raises(TypeError):
sb = BoundSignal(SignalTester.signal, s)
import weakref
sb = BoundSignal(SignalTester.signal, weakref.WeakMethod(s.slot))
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