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545 lines
21 KiB
Python
545 lines
21 KiB
Python
# Python test set -- part 5, built-in exceptions
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import os
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import sys
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import unittest
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import pickle, cPickle
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import warnings
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from test.test_support import TESTFN, unlink, run_unittest, captured_output
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from test.test_pep352 import ignore_message_warning
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# XXX This is not really enough, each *operation* should be tested!
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class ExceptionTests(unittest.TestCase):
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def testReload(self):
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# Reloading the built-in exceptions module failed prior to Py2.2, while it
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# should act the same as reloading built-in sys.
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try:
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import exceptions
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reload(exceptions)
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except ImportError, e:
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self.fail("reloading exceptions: %s" % e)
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def raise_catch(self, exc, excname):
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try:
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raise exc, "spam"
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except exc, err:
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buf1 = str(err)
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try:
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raise exc("spam")
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except exc, err:
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buf2 = str(err)
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self.assertEquals(buf1, buf2)
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self.assertEquals(exc.__name__, excname)
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def testRaising(self):
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self.raise_catch(AttributeError, "AttributeError")
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self.assertRaises(AttributeError, getattr, sys, "undefined_attribute")
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self.raise_catch(EOFError, "EOFError")
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fp = open(TESTFN, 'w')
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fp.close()
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fp = open(TESTFN, 'r')
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savestdin = sys.stdin
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try:
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try:
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sys.stdin = fp
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x = raw_input()
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except EOFError:
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pass
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finally:
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sys.stdin = savestdin
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fp.close()
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unlink(TESTFN)
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self.raise_catch(IOError, "IOError")
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self.assertRaises(IOError, open, 'this file does not exist', 'r')
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self.raise_catch(ImportError, "ImportError")
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self.assertRaises(ImportError, __import__, "undefined_module")
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self.raise_catch(IndexError, "IndexError")
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x = []
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self.assertRaises(IndexError, x.__getitem__, 10)
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self.raise_catch(KeyError, "KeyError")
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x = {}
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self.assertRaises(KeyError, x.__getitem__, 'key')
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self.raise_catch(KeyboardInterrupt, "KeyboardInterrupt")
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self.raise_catch(MemoryError, "MemoryError")
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self.raise_catch(NameError, "NameError")
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try: x = undefined_variable
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except NameError: pass
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self.raise_catch(OverflowError, "OverflowError")
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x = 1
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for dummy in range(128):
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x += x # this simply shouldn't blow up
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self.raise_catch(RuntimeError, "RuntimeError")
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self.raise_catch(SyntaxError, "SyntaxError")
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try: exec '/\n'
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except SyntaxError: pass
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self.raise_catch(IndentationError, "IndentationError")
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self.raise_catch(TabError, "TabError")
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# can only be tested under -tt, and is the only test for -tt
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#try: compile("try:\n\t1/0\n \t1/0\nfinally:\n pass\n", '<string>', 'exec')
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#except TabError: pass
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#else: self.fail("TabError not raised")
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self.raise_catch(SystemError, "SystemError")
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self.raise_catch(SystemExit, "SystemExit")
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self.assertRaises(SystemExit, sys.exit, 0)
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self.raise_catch(TypeError, "TypeError")
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try: [] + ()
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except TypeError: pass
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self.raise_catch(ValueError, "ValueError")
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self.assertRaises(ValueError, chr, 10000)
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self.raise_catch(ZeroDivisionError, "ZeroDivisionError")
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try: x = 1/0
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except ZeroDivisionError: pass
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self.raise_catch(Exception, "Exception")
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try: x = 1/0
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except Exception, e: pass
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def testSyntaxErrorMessage(self):
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# make sure the right exception message is raised for each of
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# these code fragments
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def ckmsg(src, msg):
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try:
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compile(src, '<fragment>', 'exec')
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except SyntaxError, e:
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if e.msg != msg:
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self.fail("expected %s, got %s" % (msg, e.msg))
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else:
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self.fail("failed to get expected SyntaxError")
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s = '''while 1:
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try:
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pass
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finally:
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continue'''
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if not sys.platform.startswith('java'):
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ckmsg(s, "'continue' not supported inside 'finally' clause")
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s = '''if 1:
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try:
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continue
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except:
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pass'''
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ckmsg(s, "'continue' not properly in loop")
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ckmsg("continue\n", "'continue' not properly in loop")
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def testSettingException(self):
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# test that setting an exception at the C level works even if the
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# exception object can't be constructed.
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class BadException:
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def __init__(self_):
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raise RuntimeError, "can't instantiate BadException"
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def test_capi1():
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import _testcapi
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try:
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_testcapi.raise_exception(BadException, 1)
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except TypeError, err:
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exc, err, tb = sys.exc_info()
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co = tb.tb_frame.f_code
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self.assertEquals(co.co_name, "test_capi1")
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self.assertTrue(co.co_filename.endswith('test_exceptions'+os.extsep+'py'))
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else:
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self.fail("Expected exception")
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def test_capi2():
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import _testcapi
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try:
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_testcapi.raise_exception(BadException, 0)
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except RuntimeError, err:
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exc, err, tb = sys.exc_info()
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co = tb.tb_frame.f_code
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self.assertEquals(co.co_name, "__init__")
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self.assertTrue(co.co_filename.endswith('test_exceptions'+os.extsep+'py'))
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co2 = tb.tb_frame.f_back.f_code
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self.assertEquals(co2.co_name, "test_capi2")
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else:
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self.fail("Expected exception")
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if not sys.platform.startswith('java'):
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test_capi1()
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test_capi2()
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def test_WindowsError(self):
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try:
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WindowsError
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except NameError:
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pass
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else:
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self.assertEqual(str(WindowsError(1001)),
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"1001")
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self.assertEqual(str(WindowsError(1001, "message")),
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"[Error 1001] message")
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self.assertEqual(WindowsError(1001, "message").errno, 22)
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self.assertEqual(WindowsError(1001, "message").winerror, 1001)
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def testAttributes(self):
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# test that exception attributes are happy
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exceptionList = [
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(BaseException, (), {'message' : '', 'args' : ()}),
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(BaseException, (1, ), {'message' : 1, 'args' : (1,)}),
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(BaseException, ('foo',),
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{'message' : 'foo', 'args' : ('foo',)}),
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(BaseException, ('foo', 1),
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{'message' : '', 'args' : ('foo', 1)}),
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(SystemExit, ('foo',),
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{'message' : 'foo', 'args' : ('foo',), 'code' : 'foo'}),
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(IOError, ('foo',),
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{'message' : 'foo', 'args' : ('foo',), 'filename' : None,
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'errno' : None, 'strerror' : None}),
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(IOError, ('foo', 'bar'),
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{'message' : '', 'args' : ('foo', 'bar'), 'filename' : None,
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'errno' : 'foo', 'strerror' : 'bar'}),
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(IOError, ('foo', 'bar', 'baz'),
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{'message' : '', 'args' : ('foo', 'bar'), 'filename' : 'baz',
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'errno' : 'foo', 'strerror' : 'bar'}),
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(IOError, ('foo', 'bar', 'baz', 'quux'),
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{'message' : '', 'args' : ('foo', 'bar', 'baz', 'quux')}),
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(EnvironmentError, ('errnoStr', 'strErrorStr', 'filenameStr'),
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{'message' : '', 'args' : ('errnoStr', 'strErrorStr'),
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'strerror' : 'strErrorStr', 'errno' : 'errnoStr',
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'filename' : 'filenameStr'}),
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(EnvironmentError, (1, 'strErrorStr', 'filenameStr'),
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{'message' : '', 'args' : (1, 'strErrorStr'), 'errno' : 1,
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'strerror' : 'strErrorStr', 'filename' : 'filenameStr'}),
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(SyntaxError, (), {'message' : '', 'msg' : None, 'text' : None,
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'filename' : None, 'lineno' : None, 'offset' : None,
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'print_file_and_line' : None}),
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(SyntaxError, ('msgStr',),
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{'message' : 'msgStr', 'args' : ('msgStr',), 'text' : None,
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'print_file_and_line' : None, 'msg' : 'msgStr',
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'filename' : None, 'lineno' : None, 'offset' : None}),
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(SyntaxError, ('msgStr', ('filenameStr', 'linenoStr', 'offsetStr',
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'textStr')),
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{'message' : '', 'offset' : 'offsetStr', 'text' : 'textStr',
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'args' : ('msgStr', ('filenameStr', 'linenoStr',
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'offsetStr', 'textStr')),
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'print_file_and_line' : None, 'msg' : 'msgStr',
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'filename' : 'filenameStr', 'lineno' : 'linenoStr'}),
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(SyntaxError, ('msgStr', 'filenameStr', 'linenoStr', 'offsetStr',
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'textStr', 'print_file_and_lineStr'),
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{'message' : '', 'text' : None,
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'args' : ('msgStr', 'filenameStr', 'linenoStr', 'offsetStr',
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'textStr', 'print_file_and_lineStr'),
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'print_file_and_line' : None, 'msg' : 'msgStr',
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'filename' : None, 'lineno' : None, 'offset' : None}),
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(UnicodeError, (), {'message' : '', 'args' : (),}),
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(UnicodeEncodeError, ('ascii', u'a', 0, 1, 'ordinal not in range'),
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{'message' : '', 'args' : ('ascii', u'a', 0, 1,
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'ordinal not in range'),
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'encoding' : 'ascii', 'object' : u'a',
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'start' : 0, 'reason' : 'ordinal not in range'}),
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(UnicodeDecodeError, ('ascii', '\xff', 0, 1, 'ordinal not in range'),
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{'message' : '', 'args' : ('ascii', '\xff', 0, 1,
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'ordinal not in range'),
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'encoding' : 'ascii', 'object' : '\xff',
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'start' : 0, 'reason' : 'ordinal not in range'}),
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(UnicodeTranslateError, (u"\u3042", 0, 1, "ouch"),
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{'message' : '', 'args' : (u'\u3042', 0, 1, 'ouch'),
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'object' : u'\u3042', 'reason' : 'ouch',
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'start' : 0, 'end' : 1}),
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]
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try:
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exceptionList.append(
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(WindowsError, (1, 'strErrorStr', 'filenameStr'),
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{'message' : '', 'args' : (1, 'strErrorStr'),
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'strerror' : 'strErrorStr', 'winerror' : 1,
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'errno' : 22, 'filename' : 'filenameStr'})
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)
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except NameError:
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pass
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with warnings.catch_warnings():
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ignore_message_warning()
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for exc, args, expected in exceptionList:
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try:
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raise exc(*args)
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except BaseException, e:
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if type(e) is not exc:
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raise
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# Verify module name
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self.assertEquals(type(e).__module__, 'exceptions')
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# Verify no ref leaks in Exc_str()
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s = str(e)
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for checkArgName in expected:
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self.assertEquals(repr(getattr(e, checkArgName)),
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repr(expected[checkArgName]),
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'exception "%s", attribute "%s"' %
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(repr(e), checkArgName))
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# test for pickling support
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for p in pickle, cPickle:
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for protocol in range(p.HIGHEST_PROTOCOL + 1):
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new = p.loads(p.dumps(e, protocol))
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for checkArgName in expected:
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got = repr(getattr(new, checkArgName))
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want = repr(expected[checkArgName])
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self.assertEquals(got, want,
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'pickled "%r", attribute "%s"' %
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(e, checkArgName))
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def testDeprecatedMessageAttribute(self):
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# Accessing BaseException.message and relying on its value set by
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# BaseException.__init__ triggers a deprecation warning.
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exc = BaseException("foo")
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with warnings.catch_warnings(record=True) as w:
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self.assertEquals(exc.message, "foo")
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self.assertEquals(len(w), 1)
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self.assertEquals(w[0].category, DeprecationWarning)
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self.assertEquals(
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str(w[0].message),
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"BaseException.message has been deprecated as of Python 2.6")
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def testRegularMessageAttribute(self):
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# Accessing BaseException.message after explicitly setting a value
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# for it does not trigger a deprecation warning.
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exc = BaseException("foo")
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exc.message = "bar"
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with warnings.catch_warnings(record=True) as w:
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self.assertEquals(exc.message, "bar")
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self.assertEquals(len(w), 0)
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# Deleting the message is supported, too.
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del exc.message
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with self.assertRaises(AttributeError):
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exc.message
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def testPickleMessageAttribute(self):
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# Pickling with message attribute must work, as well.
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e = Exception("foo")
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f = Exception("foo")
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f.message = "bar"
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for p in pickle, cPickle:
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ep = p.loads(p.dumps(e))
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with warnings.catch_warnings():
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ignore_message_warning()
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self.assertEqual(ep.message, "foo")
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fp = p.loads(p.dumps(f))
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self.assertEqual(fp.message, "bar")
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def testSlicing(self):
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# Test that you can slice an exception directly instead of requiring
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# going through the 'args' attribute.
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args = (1, 2, 3)
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exc = BaseException(*args)
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self.assertEqual(exc[:], args)
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def testKeywordArgs(self):
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# test that builtin exception don't take keyword args,
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# but user-defined subclasses can if they want
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self.assertRaises(TypeError, BaseException, a=1)
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class DerivedException(BaseException):
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def __init__(self, fancy_arg):
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BaseException.__init__(self)
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self.fancy_arg = fancy_arg
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x = DerivedException(fancy_arg=42)
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self.assertEquals(x.fancy_arg, 42)
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def testInfiniteRecursion(self):
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def f():
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return f()
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self.assertRaises(RuntimeError, f)
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def g():
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try:
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return g()
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except ValueError:
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return -1
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# The test prints an unraisable recursion error when
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# doing "except ValueError", this is because subclass
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# checking has recursion checking too.
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with captured_output("stderr"):
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try:
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g()
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except RuntimeError:
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pass
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except:
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self.fail("Should have raised KeyError")
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else:
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self.fail("Should have raised KeyError")
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def testUnicodeStrUsage(self):
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# Make sure both instances and classes have a str and unicode
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# representation.
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self.assertTrue(str(Exception))
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self.assertTrue(unicode(Exception))
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self.assertTrue(str(Exception('a')))
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self.assertTrue(unicode(Exception(u'a')))
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self.assertTrue(unicode(Exception(u'\xe1')))
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def test_badisinstance(self):
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# Bug #2542: if issubclass(e, MyException) raises an exception,
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# it should be ignored
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class Meta(type):
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def __subclasscheck__(cls, subclass):
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raise ValueError()
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class MyException(Exception):
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__metaclass__ = Meta
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pass
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with captured_output("stderr") as stderr:
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try:
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raise KeyError()
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except MyException, e:
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self.fail("exception should not be a MyException")
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except KeyError:
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pass
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except:
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self.fail("Should have raised KeyError")
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else:
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self.fail("Should have raised KeyError")
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with captured_output("stderr") as stderr:
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def g():
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try:
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return g()
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except RuntimeError:
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return sys.exc_info()
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e, v, tb = g()
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self.assertTrue(e is RuntimeError, e)
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self.assertTrue("maximum recursion depth exceeded" in str(v), v)
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# Helper class used by TestSameStrAndUnicodeMsg
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class ExcWithOverriddenStr(Exception):
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"""Subclass of Exception that accepts a keyword 'msg' arg that is
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returned by __str__. 'msg' won't be included in self.args"""
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def __init__(self, *args, **kwargs):
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self.msg = kwargs.pop('msg') # msg should always be present
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super(ExcWithOverriddenStr, self).__init__(*args, **kwargs)
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def __str__(self):
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return self.msg
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class TestSameStrAndUnicodeMsg(unittest.TestCase):
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"""unicode(err) should return the same message of str(err). See #6108"""
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def check_same_msg(self, exc, msg):
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"""Helper function that checks if str(exc) == unicode(exc) == msg"""
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self.assertEqual(str(exc), msg)
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self.assertEqual(str(exc), unicode(exc))
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def test_builtin_exceptions(self):
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"""Check same msg for built-in exceptions"""
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# These exceptions implement a __str__ method that uses the args
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# to create a better error message. unicode(e) should return the same
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# message.
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exceptions = [
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SyntaxError('invalid syntax', ('<string>', 1, 3, '2+*3')),
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IOError(2, 'No such file or directory'),
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KeyError('both should have the same quotes'),
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UnicodeDecodeError('ascii', '\xc3\xa0', 0, 1,
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'ordinal not in range(128)'),
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UnicodeEncodeError('ascii', u'\u1234', 0, 1,
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'ordinal not in range(128)')
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]
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for exception in exceptions:
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self.assertEqual(str(exception), unicode(exception))
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def test_0_args(self):
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"""Check same msg for Exception with 0 args"""
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# str() and unicode() on an Exception with no args should return an
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# empty string
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self.check_same_msg(Exception(), '')
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def test_0_args_with_overridden___str__(self):
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"""Check same msg for exceptions with 0 args and overridden __str__"""
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# str() and unicode() on an exception with overridden __str__ that
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# returns an ascii-only string should return the same string
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for msg in ('foo', u'foo'):
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self.check_same_msg(ExcWithOverriddenStr(msg=msg), msg)
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# if __str__ returns a non-ascii unicode string str() should fail
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# but unicode() should return the unicode string
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e = ExcWithOverriddenStr(msg=u'f\xf6\xf6') # no args
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self.assertRaises(UnicodeEncodeError, str, e)
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self.assertEqual(unicode(e), u'f\xf6\xf6')
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def test_1_arg(self):
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"""Check same msg for Exceptions with 1 arg"""
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for arg in ('foo', u'foo'):
|
|
self.check_same_msg(Exception(arg), arg)
|
|
|
|
# if __str__ is not overridden and self.args[0] is a non-ascii unicode
|
|
# string, str() should try to return str(self.args[0]) and fail.
|
|
# unicode() should return unicode(self.args[0]) and succeed.
|
|
e = Exception(u'f\xf6\xf6')
|
|
self.assertRaises(UnicodeEncodeError, str, e)
|
|
self.assertEqual(unicode(e), u'f\xf6\xf6')
|
|
|
|
def test_1_arg_with_overridden___str__(self):
|
|
"""Check same msg for exceptions with overridden __str__ and 1 arg"""
|
|
# when __str__ is overridden and __unicode__ is not implemented
|
|
# unicode(e) returns the same as unicode(e.__str__()).
|
|
for msg in ('foo', u'foo'):
|
|
self.check_same_msg(ExcWithOverriddenStr('arg', msg=msg), msg)
|
|
|
|
# if __str__ returns a non-ascii unicode string, str() should fail
|
|
# but unicode() should succeed.
|
|
e = ExcWithOverriddenStr('arg', msg=u'f\xf6\xf6') # 1 arg
|
|
self.assertRaises(UnicodeEncodeError, str, e)
|
|
self.assertEqual(unicode(e), u'f\xf6\xf6')
|
|
|
|
def test_many_args(self):
|
|
"""Check same msg for Exceptions with many args"""
|
|
argslist = [
|
|
(3, 'foo'),
|
|
(1, u'foo', 'bar'),
|
|
(4, u'f\xf6\xf6', u'bar', 'baz')
|
|
]
|
|
# both str() and unicode() should return a repr() of the args
|
|
for args in argslist:
|
|
self.check_same_msg(Exception(*args), repr(args))
|
|
|
|
def test_many_args_with_overridden___str__(self):
|
|
"""Check same msg for exceptions with overridden __str__ and many args"""
|
|
# if __str__ returns an ascii string / ascii unicode string
|
|
# both str() and unicode() should succeed
|
|
for msg in ('foo', u'foo'):
|
|
e = ExcWithOverriddenStr('arg1', u'arg2', u'f\xf6\xf6', msg=msg)
|
|
self.check_same_msg(e, msg)
|
|
|
|
# if __str__ returns a non-ascii unicode string, str() should fail
|
|
# but unicode() should succeed
|
|
e = ExcWithOverriddenStr('arg1', u'f\xf6\xf6', u'arg3', # 3 args
|
|
msg=u'f\xf6\xf6')
|
|
self.assertRaises(UnicodeEncodeError, str, e)
|
|
self.assertEqual(unicode(e), u'f\xf6\xf6')
|
|
|
|
|
|
def test_main():
|
|
run_unittest(ExceptionTests, TestSameStrAndUnicodeMsg)
|
|
|
|
if __name__ == '__main__':
|
|
test_main()
|