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# -*- coding: utf-8 -*-
"""Test exception support."""
import sys
import System
import pytest
import pickle
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)