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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.weakmethod import WeakMethod
class CObj:
def __init__(self):
self.counter = 0
self.last_args = ()
self.last_kwargs = {}
def meth(self, *args, **kwargs):
self.counter += 1
self.last_args = args
self.last_kwargs = kwargs
return 1
def test_weakmethod_lifetime():
"""Test WeakMethod lifetime.
"""
obj = CObj()
wm = WeakMethod(obj.meth)
assert wm is WeakMethod(obj.meth)
assert wm(1, 2, a=2, b=3) == 1
assert obj.counter == 1
assert obj.last_args == (1, 2)
assert obj.last_kwargs == dict(a=2, b=3)
del obj
gc.collect()
assert wm() is None
def test_handling_bad_arguments():
"""Test handling bad arguments to WeakMethod.
"""
with pytest.raises(TypeError) as exc:
WeakMethod(a=1)
assert "keyword" in exc.value.args[0]
with pytest.raises(TypeError) as exc:
WeakMethod(1, 2)
assert "1 argument" in exc.value.args[0]
with pytest.raises(TypeError) as exc:
WeakMethod()
assert "1 argument" in exc.value.args[0]
with pytest.raises(TypeError) as exc:
WeakMethod(CObj.meth)
assert "MethodType" in exc.value.args[0]
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