def test_python_alreadyset_in_destructor(monkeypatch, capsys):
hooked = False
triggered = [False] # mutable, so Python 2.7 closure can modify it
if hasattr(sys, "unraisablehook"): # Python 3.8+
hooked = True
# Don't take `sys.unraisablehook`, as that's overwritten by pytest
default_hook = sys.__unraisablehook__
def hook(unraisable_hook_args):
exc_type, exc_value, exc_tb, err_msg, obj = unraisable_hook_args
if obj == "already_set demo":
triggered[0] = True
default_hook(unraisable_hook_args)
return
# Use monkeypatch so pytest can apply and remove the patch as appropriate
monkeypatch.setattr(sys, "unraisablehook", hook)
assert m.python_alreadyset_in_destructor("already_set demo") is True
if hooked:
assert triggered[0] is True
_, captured_stderr = capsys.readouterr()
# Error message is different in Python 2 and 3, check for words that appear in both
assert "ignored" in captured_stderr and "already_set demo" in captured_stderr
def test_python_alreadyset_in_destructor(monkeypatch, capsys):
hooked = False
triggered = False
if hasattr(sys, "unraisablehook"): # Python 3.8+
hooked = True
# Don't take `sys.unraisablehook`, as that's overwritten by pytest
default_hook = sys.__unraisablehook__
def hook(unraisable_hook_args):
exc_type, exc_value, exc_tb, err_msg, obj = unraisable_hook_args
if obj == "already_set demo":
nonlocal triggered
triggered = True
default_hook(unraisable_hook_args)
return
# Use monkeypatch so pytest can apply and remove the patch as appropriate
monkeypatch.setattr(sys, "unraisablehook", hook)
assert m.python_alreadyset_in_destructor("already_set demo") is True
if hooked:
assert triggered is True
_, captured_stderr = capsys.readouterr()
assert captured_stderr.startswith(
"Exception ignored in: 'already_set demo'")
assert captured_stderr.rstrip().endswith("KeyError: 'bar'")
