# Python test set -- part 5, built-in exceptions
import os
import sys
import unittest
import pickle, cPickle
import warnings
from test.test_support import TESTFN, unlink, run_unittest, captured_output
from test.test_pep352 import ignore_message_warning
# XXX This is not really enough, each *operation* should be tested!
class ExceptionTests(unittest.TestCase):
def testReload(self):
# Reloading the built-in exceptions module failed prior to Py2.2, while it
# should act the same as reloading built-in sys.
try:
import exceptions
reload(exceptions)
except ImportError, e:
self.fail("reloading exceptions: %s" % e)
def raise_catch(self, exc, excname):
try:
raise exc, "spam"
except exc, err:
buf1 = str(err)
try:
raise exc("spam")
except exc, err:
buf2 = str(err)
self.assertEquals(buf1, buf2)
self.assertEquals(exc.__name__, excname)
def testRaising(self):
self.raise_catch(AttributeError, "AttributeError")
self.assertRaises(AttributeError, getattr, sys, "undefined_attribute")
self.raise_catch(EOFError, "EOFError")
fp = open(TESTFN, 'w')
fp.close()
fp = open(TESTFN, 'r')
savestdin = sys.stdin
try:
try:
sys.stdin = fp
x = raw_input()
except EOFError:
pass
finally:
sys.stdin = savestdin
fp.close()
unlink(TESTFN)
self.raise_catch(IOError, "IOError")
self.assertRaises(IOError, open, 'this file does not exist', 'r')
self.raise_catch(ImportError, "ImportError")
self.assertRaises(ImportError, __import__, "undefined_module")
self.raise_catch(IndexError, "IndexError")
x = []
self.assertRaises(IndexError, x.__getitem__, 10)
self.raise_catch(KeyError, "KeyError")
x = {}
self.assertRaises(KeyError, x.__getitem__, 'key')
self.raise_catch(KeyboardInterrupt, "KeyboardInterrupt")
self.raise_catch(MemoryError, "MemoryError")
self.raise_catch(NameError, "NameError")
try: x = undefined_variable
except NameError: pass
self.raise_catch(OverflowError, "OverflowError")
x = 1
for dummy in range(128):
x += x # this simply shouldn't blow up
self.raise_catch(RuntimeError, "RuntimeError")
self.raise_catch(SyntaxError, "SyntaxError")
try: exec '/\n'
except SyntaxError: pass
self.raise_catch(IndentationError, "IndentationError")
self.raise_catch(TabError, "TabError")
# can only be tested under -tt, and is the only test for -tt
#try: compile("try:\n\t1/0\n \t1/0\nfinally:\n pass\n", '<string>', 'exec')
#except TabError: pass
#else: self.fail("TabError not raised")
self.raise_catch(SystemError, "SystemError")
self.raise_catch(SystemExit, "SystemExit")
self.assertRaises(SystemExit, sys.exit, 0)
self.raise_catch(TypeError, "TypeError")
try: [] + ()
except TypeError: pass
self.raise_catch(ValueError, "ValueError")
self.assertRaises(ValueError, chr, 10000)
self.raise_catch(ZeroDivisionError, "ZeroDivisionError")
try: x = 1/0
except ZeroDivisionError: pass
self.raise_catch(Exception, "Exception")
try: x = 1/0
except Exception, e: pass
def testSyntaxErrorMessage(self):
# make sure the right exception message is raised for each of
# these code fragments
def ckmsg(src, msg):
try:
compile(src, '<fragment>', 'exec')
except SyntaxError, e:
if e.msg != msg:
self.fail("expected %s, got %s" % (msg, e.msg))
else:
self.fail("failed to get expected SyntaxError")
s = '''while 1:
try:
pass
finally:
continue'''
if not sys.platform.startswith('java'):
ckmsg(s, "'continue' not supported inside 'finally' clause")
s = '''if 1:
try:
continue
except:
pass'''
ckmsg(s, "'continue' not properly in loop")
ckmsg("continue\n", "'continue' not properly in loop")
def testSettingException(self):
# test that setting an exception at the C level works even if the
# exception object can't be constructed.
class BadException:
def __init__(self_):
raise RuntimeError, "can't instantiate BadException"
def test_capi1():
import _testcapi
try:
_testcapi.raise_exception(BadException, 1)
except TypeError, err:
exc, err, tb = sys.exc_info()
co = tb.tb_frame.f_code
self.assertEquals(co.co_name, "test_capi1")
self.assert_(co.co_filename.endswith('test_exceptions'+os.extsep+'py'))
else:
self.fail("Expected exception")
def test_capi2():
import _testcapi
try:
_testcapi.raise_exception(BadException, 0)
except RuntimeError, err:
exc, err, tb = sys.exc_info()
co = tb.tb_frame.f_code
self.assertEquals(co.co_name, "__init__")
self.assert_(co.co_filename.endswith('test_exceptions'+os.extsep+'py'))
co2 = tb.tb_frame.f_back.f_code
self.assertEquals(co2.co_name, "test_capi2")
else:
self.fail("Expected exception")
if not sys.platform.startswith('java'):
test_capi1()
test_capi2()
def test_WindowsError(self):
try:
WindowsError
except NameError:
pass
else:
self.failUnlessEqual(str(WindowsError(1001)),
"1001")
self.failUnlessEqual(str(WindowsError(1001, "message")),
"[Error 1001] message")
self.failUnlessEqual(WindowsError(1001, "message").errno, 22)
self.failUnlessEqual(WindowsError(1001, "message").winerror, 1001)
def testAttributes(self):
# test that exception attributes are happy
exceptionList = [
(BaseException, (), {'message' : '', 'args' : ()}),
(BaseException, (1, ), {'message' : 1, 'args' : (1,)}),
(BaseException, ('foo',),
{'message' : 'foo', 'args' : ('foo',)}),
(BaseException, ('foo', 1),
{'message' : '', 'args' : ('foo', 1)}),
(SystemExit, ('foo',),
{'message' : 'foo', 'args' : ('foo',), 'code' : 'foo'}),
(IOError, ('foo',),
{'message' : 'foo', 'args' : ('foo',), 'filename' : None,
'errno' : None, 'strerror' : None}),
(IOError, ('foo', 'bar'),
{'message' : '', 'args' : ('foo', 'bar'), 'filename' : None,
'errno' : 'foo', 'strerror' : 'bar'}),
(IOError, ('foo', 'bar', 'baz'),
{'message' : '', 'args' : ('foo', 'bar'), 'filename' : 'baz',
'errno' : 'foo', 'strerror' : 'bar'}),
(IOError, ('foo', 'bar', 'baz', 'quux'),
{'message' : '', 'args' : ('foo', 'bar', 'baz', 'quux')}),
(EnvironmentError, ('errnoStr', 'strErrorStr', 'filenameStr'),
{'message' : '', 'args' : ('errnoStr', 'strErrorStr'),
'strerror' : 'strErrorStr', 'errno' : 'errnoStr',
'filename' : 'filenameStr'}),
(EnvironmentError, (1, 'strErrorStr', 'filenameStr'),
{'message' : '', 'args' : (1, 'strErrorStr'), 'errno' : 1,
'strerror' : 'strErrorStr', 'filename' : 'filenameStr'}),
(SyntaxError, (), {'message' : '', 'msg' : None, 'text' : None,
'filename' : None, 'lineno' : None, 'offset' : None,
'print_file_and_line' : None}),
(SyntaxError, ('msgStr',),
{'message' : 'msgStr', 'args' : ('msgStr',), 'text' : None,
'print_file_and_line' : None, 'msg' : 'msgStr',
'filename' : None, 'lineno' : None, 'offset' : None}),
(SyntaxError, ('msgStr', ('filenameStr', 'linenoStr', 'offsetStr',
'textStr')),
{'message' : '', 'offset' : 'offsetStr', 'text' : 'textStr',
'args' : ('msgStr', ('filenameStr', 'linenoStr',
'offsetStr', 'textStr')),
'print_file_and_line' : None, 'msg' : 'msgStr',
'filename' : 'filenameStr', 'lineno' : 'linenoStr'}),
(SyntaxError, ('msgStr', 'filenameStr', 'linenoStr', 'offsetStr',
'textStr', 'print_file_and_lineStr'),
{'message' : '', 'text' : None,
'args' : ('msgStr', 'filenameStr', 'linenoStr', 'offsetStr',
'textStr', 'print_file_and_lineStr'),
'print_file_and_line' : None, 'msg' : 'msgStr',
'filename' : None, 'lineno' : None, 'offset' : None}),
(UnicodeError, (), {'message' : '', 'args' : (),}),
(UnicodeEncodeError, ('ascii', u'a', 0, 1, 'ordinal not in range'),
{'message' : '', 'args' : ('ascii', u'a', 0, 1,
'ordinal not in range'),
'encoding' : 'ascii', 'object' : u'a',
'start' : 0, 'reason' : 'ordinal not in range'}),
(UnicodeDecodeError, ('ascii', '\xff', 0, 1, 'ordinal not in range'),
{'message' : '', 'args' : ('ascii', '\xff', 0, 1,
'ordinal not in range'),
'encoding' : 'ascii', 'object' : '\xff',
'start' : 0, 'reason' : 'ordinal not in range'}),
(UnicodeTranslateError, (u"\u3042", 0, 1, "ouch"),
{'message' : '', 'args' : (u'\u3042', 0, 1, 'ouch'),
'object' : u'\u3042', 'reason' : 'ouch',
'start' : 0, 'end' : 1}),
]
try:
exceptionList.append(
(WindowsError, (1, 'strErrorStr', 'filenameStr'),
{'message' : '', 'args' : (1, 'strErrorStr'),
'strerror' : 'strErrorStr', 'winerror' : 1,
'errno' : 22, 'filename' : 'filenameStr'})
)
except NameError:
pass
with warnings.catch_warnings():
ignore_message_warning()
for exc, args, expected in exceptionList:
try:
raise exc(*args)
except BaseException, e:
if type(e) is not exc:
raise
# Verify module name
self.assertEquals(type(e).__module__, 'exceptions')
# Verify no ref leaks in Exc_str()
s = str(e)
for checkArgName in expected:
self.assertEquals(repr(getattr(e, checkArgName)),
repr(expected[checkArgName]),
'exception "%s", attribute "%s"' %
(repr(e), checkArgName))
# test for pickling support
for p in pickle, cPickle:
for protocol in range(p.HIGHEST_PROTOCOL + 1):
new = p.loads(p.dumps(e, protocol))
for checkArgName in expected:
got = repr(getattr(new, checkArgName))
want = repr(expected[checkArgName])
self.assertEquals(got, want,
'pickled "%r", attribute "%s"' %
(e, checkArgName))
def testSlicing(self):
# Test that you can slice an exception directly instead of requiring
# going through the 'args' attribute.
args = (1, 2, 3)
exc = BaseException(*args)
self.failUnlessEqual(exc[:], args)
def testKeywordArgs(self):
# test that builtin exception don't take keyword args,
# but user-defined subclasses can if they want
self.assertRaises(TypeError, BaseException, a=1)
class DerivedException(BaseException):
def __init__(self, fancy_arg):
BaseException.__init__(self)
self.fancy_arg = fancy_arg
x = DerivedException(fancy_arg=42)
self.assertEquals(x.fancy_arg, 42)
def testInfiniteRecursion(self):
def f():
return f()
self.assertRaises(RuntimeError, f)
def g():
try:
return g()
except ValueError:
return -1
# The test prints an unraisable recursion error when
# doing "except ValueError", this is because subclass
# checking has recursion checking too.
with captured_output("stderr"):
try:
g()
except RuntimeError:
pass
except:
self.fail("Should have raised KeyError")
else:
self.fail("Should have raised KeyError")
def testUnicodeStrUsage(self):
# Make sure both instances and classes have a str and unicode
# representation.
self.failUnless(str(Exception))
self.failUnless(unicode(Exception))
self.failUnless(str(Exception('a')))
self.failUnless(unicode(Exception(u'a')))
self.failUnless(unicode(Exception(u'\xe1')))
def test_badisinstance(self):
# Bug #2542: if issubclass(e, MyException) raises an exception,
# it should be ignored
class Meta(type):
def __subclasscheck__(cls, subclass):
raise ValueError()
class MyException(Exception):
__metaclass__ = Meta
pass
with captured_output("stderr") as stderr:
try:
raise KeyError()
except MyException, e:
self.fail("exception should not be a MyException")
except KeyError:
pass
except:
self.fail("Should have raised KeyError")
else:
self.fail("Should have raised KeyError")
with captured_output("stderr") as stderr:
def g():
try:
return g()
except RuntimeError:
return sys.exc_info()
e, v, tb = g()
self.assert_(e is RuntimeError, e)
self.assert_("maximum recursion depth exceeded" in str(v), v)
def test_main():
run_unittest(ExceptionTests)
if __name__ == '__main__':
test_main()