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test_exceptions.py
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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
)
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