pythonnet/tests/test_exceptions.py at python3.14 · guywithface/pythonnet · GitHub

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# -*- coding: utf-8 -*-

"""Test exception support."""

import sys

import System

import pytest

import pickle

# begin code from https://utcc.utoronto.ca/~cks/space/blog/python/GetAllObjects

import gc

# Recursively expand slist's objects

# into olist, using seen to track

# already processed objects.

def _getr(slist, olist, seen):

for e in slist:

if id(e) in seen:

continue

seen[id(e)] = None

olist.append(e)

tl = gc.get_referents(e)

if tl:

_getr(tl, olist, seen)

# The public function.

def get_all_objects():

gcl = gc.get_objects()

olist = []

seen = {}

# Just in case:

seen[id(gcl)] = None

seen[id(olist)] = None

seen[id(seen)] = None

# _getr does the real work.

_getr(gcl, olist, seen)

return olist

# end code from https://utcc.utoronto.ca/~cks/space/blog/python/GetAllObjects

def leak_check(func):

def do_leak_check():

func()

gc.collect()

exc = {x for x in get_all_objects() if isinstance(x, Exception) and not isinstance(x, pytest.PytestDeprecationWarning)}

print(len(exc))

if len(exc):

for x in exc:

print('-------')

print(repr(x))

print(gc.get_referrers(x))

print(len(gc.get_referrers(x)))

assert False

gc.collect()

return do_leak_check

def test_unified_exception_semantics():

"""Test unified exception semantics."""

e = System.Exception('Something bad happened')

assert isinstance(e, Exception)

assert isinstance(e, System.Exception)

def test_standard_exception_attributes():

"""Test accessing standard exception attributes."""

from System import OverflowException

from Python.Test import ExceptionTest

e = ExceptionTest.GetExplicitException()

assert isinstance(e, OverflowException)

assert e.Message == 'error'

e.Source = 'Test Suite'

assert e.Source == 'Test Suite'

v = e.ToString()

assert len(v) > 0

def test_extended_exception_attributes():

"""Test accessing extended exception attributes."""

from Python.Test import ExceptionTest, ExtendedException

from System import OverflowException

e = ExceptionTest.GetExtendedException()

assert isinstance(e, ExtendedException)

assert isinstance(e, OverflowException)

assert isinstance(e, System.Exception)

assert e.Message == 'error'

e.Source = 'Test Suite'

assert e.Source == 'Test Suite'

v = e.ToString()

assert len(v) > 0

assert e.ExtraProperty == 'extra'

e.ExtraProperty = 'changed'

assert e.ExtraProperty == 'changed'

assert e.GetExtraInfo() == 'changed'

def test_raise_class_exception():

"""Test class exception propagation."""

from System import NullReferenceException

with pytest.raises(NullReferenceException) as cm:

raise NullReferenceException

exc = cm.value

assert isinstance(exc, NullReferenceException)

def test_exc_info():

"""Test class exception propagation.

Behavior of exc_info changed in Py3. Refactoring its test"""

from System import NullReferenceException

try:

raise NullReferenceException("message")

except Exception as exc:

type_, value, tb = sys.exc_info()

assert type_ is NullReferenceException

assert value.Message == "message"

assert exc.Message == "message"

# FIXME: Lower-case message isn't implemented

# self.assertTrue(exc.message == "message")

assert value is exc

def test_raise_class_exception_with_value():

"""Test class exception propagation with associated value."""

from System import NullReferenceException

with pytest.raises(NullReferenceException) as cm:

raise NullReferenceException('Aiiieee!')

exc = cm.value

assert isinstance(exc, NullReferenceException)

assert exc.Message == 'Aiiieee!'

def test_raise_instance_exception():

"""Test instance exception propagation."""

from System import NullReferenceException

with pytest.raises(NullReferenceException) as cm:

raise NullReferenceException()

exc = cm.value

assert isinstance(exc, NullReferenceException)

assert len(exc.Message) > 0

def test_raise_instance_exception_with_args():

"""Test instance exception propagation with args."""

from System import NullReferenceException

with pytest.raises(NullReferenceException) as cm:

raise NullReferenceException("Aiiieee!")

exc = cm.value

assert isinstance(exc, NullReferenceException)

assert exc.Message == 'Aiiieee!'

def test_managed_exception_propagation():

"""Test propagation of exceptions raised in managed code."""

from System import Decimal, OverflowException

with pytest.raises(OverflowException):

Decimal.ToInt64(Decimal.MaxValue)

def test_managed_exception_conversion():

"""Test conversion of managed exceptions."""

from System import OverflowException

from Python.Test import ExceptionTest

e = ExceptionTest.GetBaseException()

assert isinstance(e, System.Exception)

e = ExceptionTest.GetExplicitException()

assert isinstance(e, OverflowException)

assert isinstance(e, System.Exception)

e = ExceptionTest.GetWidenedException()

assert isinstance(e, OverflowException)

assert isinstance(e, System.Exception)

v = ExceptionTest.SetBaseException(System.Exception('error'))

assert v

v = ExceptionTest.SetExplicitException(OverflowException('error'))

assert v

v = ExceptionTest.SetWidenedException(OverflowException('error'))

assert v

def test_catch_exception_from_managed_method():

"""Test catching an exception from a managed method."""

from Python.Test import ExceptionTest

from System import OverflowException

with pytest.raises(OverflowException) as cm:

ExceptionTest().ThrowException()

e = cm.value

assert isinstance(e, OverflowException)

def test_catch_exception_from_managed_property():

"""Test catching an exception from a managed property."""

from Python.Test import ExceptionTest

from System import OverflowException

with pytest.raises(OverflowException) as cm:

_ = ExceptionTest().ThrowProperty

e = cm.value

assert isinstance(e, OverflowException)

with pytest.raises(OverflowException) as cm:

ExceptionTest().ThrowProperty = 1

e = cm.value

assert isinstance(e, OverflowException)

def test_catch_exception_managed_class():

"""Test catching the managed class of an exception."""

from System import OverflowException

with pytest.raises(OverflowException):

raise OverflowException('overflow')

def test_catch_exception_python_class():

"""Test catching the python class of an exception."""

from System import OverflowException

with pytest.raises(Exception):

raise OverflowException('overflow')

def test_catch_exception_base_class():

"""Test catching the base of an exception."""

from System import OverflowException, ArithmeticException

with pytest.raises(ArithmeticException):

raise OverflowException('overflow')

def test_catch_exception_nested_base_class():

"""Test catching the nested base of an exception."""

from System import OverflowException, SystemException

with pytest.raises(SystemException):

raise OverflowException('overflow')

def test_catch_exception_with_assignment():

"""Test catching an exception with assignment."""

from System import OverflowException

with pytest.raises(OverflowException) as cm:

raise OverflowException('overflow')

e = cm.value

assert isinstance(e, OverflowException)

def test_catch_exception_unqualified():

"""Test catching an unqualified exception."""

from System import OverflowException

try:

raise OverflowException('overflow')

except:

pass

else:

self.fail("failed to catch unqualified exception")

def test_catch_baseexception():

"""Test catching an unqualified exception with BaseException."""

from System import OverflowException

with pytest.raises(BaseException):

raise OverflowException('overflow')

def test_apparent_module_of_exception():

"""Test the apparent module of an exception."""

from System import OverflowException

assert System.Exception.__module__ == 'System'

assert OverflowException.__module__ == 'System'

def test_str_of_exception():

"""Test the str() representation of an exception."""

from System import NullReferenceException, Convert, FormatException

e = NullReferenceException('')

assert str(e) == ''

e = NullReferenceException('Something bad happened')

assert str(e).startswith('Something bad happened')

with pytest.raises(FormatException) as cm:

Convert.ToDateTime('this will fail')

def test_python_compat_of_managed_exceptions():

"""Test managed exceptions compatible with Python's implementation"""

from System import OverflowException

msg = "Simple message"

e = OverflowException(msg)

assert str(e) == msg

assert e.args == (msg,)

assert isinstance(e.args, tuple)

strexp = "OverflowException('Simple message"

assert repr(e)[:len(strexp)] == strexp

def test_exception_is_instance_of_system_object():

"""Test behavior of isinstance(<managed exception>, System.Object)."""

# This is an anti-test, in that this is a caveat of the current

# implementation. Because exceptions are not allowed to be new-style

# classes, we wrap managed exceptions in a general-purpose old-style

# class that delegates to the wrapped object. This makes _almost_

# everything work as expected, except that an isinstance check against

# System.Object will fail for a managed exception (because a new

# style class cannot appear in the __bases__ of an old-style class

# without causing a crash in the CPython interpreter). This test is

# here mainly to remind me to update the caveat in the documentation

# one day when when exceptions can be new-style classes.

# This behavior is now over-shadowed by the implementation of

# __instancecheck__ (i.e., overloading isinstance), so for all Python

# version >= 2.6 we expect isinstance(<managed exception>, Object) to

# be true, even though it does not really subclass Object.

from System import OverflowException, Object

o = OverflowException('error')

if sys.version_info >= (2, 6):

assert isinstance(o, Object)

else:

assert not isinstance(o, Object)

def test_pickling_exceptions():

exc = System.Exception("test")

dumped = pickle.dumps(exc)

loaded = pickle.loads(dumped)

assert exc.args == loaded.args

def test_chained_exceptions():

from Python.Test import ExceptionTest

with pytest.raises(Exception) as cm:

ExceptionTest.ThrowChainedExceptions()

exc = cm.value

msgs = ("Outer exception",

"Inner exception",

"Innermost exception",)

for msg in msgs:

assert exc.Message == msg

assert exc.__cause__ == exc.InnerException

exc = exc.__cause__

def test_iteration_exception():

from Python.Test import ExceptionTest

from System import OverflowException

exception = OverflowException("error")

val = ExceptionTest.ThrowExceptionInIterator(exception).__iter__()

assert next(val) == 1

assert next(val) == 2

with pytest.raises(OverflowException) as cm:

next(val)

exc = cm.value

assert exc == exception

# after exception is thrown iterator is no longer valid

with pytest.raises(StopIteration):

next(val)

def test_iteration_innerexception():

from Python.Test import ExceptionTest

from System import OverflowException

exception = System.Exception("message", OverflowException("error"))

val = ExceptionTest.ThrowExceptionInIterator(exception).__iter__()

assert next(val) == 1

assert next(val) == 2

with pytest.raises(OverflowException) as cm:

next(val)

exc = cm.value

assert exc == exception.InnerException

# after exception is thrown iterator is no longer valid

with pytest.raises(StopIteration):

next(val)

def leak_test(func):

def do_test_leak():

# PyTest leaks things, gather the current state

orig_exc = {x for x in get_all_objects() if isinstance(x, Exception)}

func()

exc = {x for x in get_all_objects() if isinstance(x, Exception)}

possibly_leaked = exc - orig_exc

assert not possibly_leaked

return do_test_leak

@leak_test

def test_dont_leak_exceptions_simple():

from Python.Test import ExceptionTest

try:

ExceptionTest.DoThrowSimple()

except System.ArgumentException:

print('type error, as expected')

@leak_test

def test_dont_leak_exceptions_inner():

from Python.Test import ExceptionTest

try:

ExceptionTest.DoThrowWithInner()

except TypeError:

print('type error, as expected')

except System.ArgumentException:

print('type error, also expected')

pythonnet/tests/test_exceptions.py at python3.14 · guywithface/pythonnet · GitHub

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