mirror of https://github.com/python/cpython
446 lines
16 KiB
Python
446 lines
16 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
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import weakref
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from test.test_support import TESTFN, unlink, run_unittest
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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 raise_catch(self, exc, excname):
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try:
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raise exc("spam")
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except exc as 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 as 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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import marshal
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marshal.loads('')
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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, 17<<16)
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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 as 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 as 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(Exception):
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def __init__(self_):
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raise RuntimeError("can't instantiate BadException")
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class InvalidException:
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pass
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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 as 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.assert_(co.co_filename.endswith('test_exceptions.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 as 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.assert_(co.co_filename.endswith('test_exceptions.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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def test_capi3():
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import _testcapi
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self.assertRaises(SystemError, _testcapi.raise_exception,
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InvalidException, 1)
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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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test_capi3()
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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.failUnlessEqual(str(WindowsError(1001)),
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"1001")
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self.failUnlessEqual(str(WindowsError(1001, "message")),
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"[Error 1001] message")
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self.failUnlessEqual(WindowsError(1001, "message").errno, 22)
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self.failUnlessEqual(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, (), {'args' : ()}),
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(BaseException, (1, ), {'args' : (1,)}),
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(BaseException, ('foo',),
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{'args' : ('foo',)}),
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(BaseException, ('foo', 1),
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{'args' : ('foo', 1)}),
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(SystemExit, ('foo',),
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{'args' : ('foo',), 'code' : 'foo'}),
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(IOError, ('foo',),
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{'args' : ('foo',), 'filename' : None,
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'errno' : None, 'strerror' : None}),
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(IOError, ('foo', 'bar'),
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{'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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{'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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{'args' : ('foo', 'bar', 'baz', 'quux')}),
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(EnvironmentError, ('errnoStr', 'strErrorStr', 'filenameStr'),
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{'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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{'args' : (1, 'strErrorStr'), 'errno' : 1,
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'strerror' : 'strErrorStr', 'filename' : 'filenameStr'}),
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(SyntaxError, (), {'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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{'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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{'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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{'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, (), {'args' : (),}),
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(UnicodeEncodeError, ('ascii', 'a', 0, 1,
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'ordinal not in range'),
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{'args' : ('ascii', 'a', 0, 1,
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'ordinal not in range'),
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'encoding' : 'ascii', 'object' : 'a',
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'start' : 0, 'reason' : 'ordinal not in range'}),
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(UnicodeDecodeError, ('ascii', bytearray(b'\xff'), 0, 1,
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'ordinal not in range'),
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{'args' : ('ascii', bytearray(b'\xff'), 0, 1,
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'ordinal not in range'),
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'encoding' : 'ascii', 'object' : b'\xff',
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'start' : 0, 'reason' : 'ordinal not in range'}),
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(UnicodeDecodeError, ('ascii', b'\xff', 0, 1,
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'ordinal not in range'),
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{'args' : ('ascii', b'\xff', 0, 1,
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'ordinal not in range'),
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'encoding' : 'ascii', 'object' : b'\xff',
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'start' : 0, 'reason' : 'ordinal not in range'}),
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(UnicodeTranslateError, ("\u3042", 0, 1, "ouch"),
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{'args' : ('\u3042', 0, 1, 'ouch'),
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'object' : '\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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{'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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for exc, args, expected in exceptionList:
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try:
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e = exc(*args)
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except:
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print("\nexc=%r, args=%r" % (exc, args), file=sys.stderr)
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raise
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else:
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# Verify module name
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self.assertEquals(type(e).__module__, 'builtins')
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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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value = getattr(e, checkArgName)
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self.assertEquals(repr(value),
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repr(expected[checkArgName]),
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'%r.%s == %r, expected %r' % (
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e, checkArgName,
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value, expected[checkArgName]))
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# test for pickling support
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for p in [pickle]:
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for protocol in range(p.HIGHEST_PROTOCOL + 1):
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s = p.dumps(e, protocol)
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new = p.loads(s)
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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 testWithTraceback(self):
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try:
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raise IndexError(4)
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except:
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tb = sys.exc_info()[2]
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e = BaseException().with_traceback(tb)
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self.failUnless(isinstance(e, BaseException))
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self.assertEqual(e.__traceback__, tb)
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e = IndexError(5).with_traceback(tb)
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self.failUnless(isinstance(e, IndexError))
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self.assertEqual(e.__traceback__, tb)
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class MyException(Exception):
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pass
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e = MyException().with_traceback(tb)
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self.failUnless(isinstance(e, MyException))
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self.assertEqual(e.__traceback__, tb)
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def testInvalidTraceback(self):
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try:
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Exception().__traceback__ = 5
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except TypeError as e:
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self.failUnless("__traceback__ must be a traceback" in str(e))
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else:
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self.fail("No exception raised")
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def testNoneClearsTracebackAttr(self):
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try:
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raise IndexError(4)
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except:
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tb = sys.exc_info()[2]
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e = Exception()
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e.__traceback__ = tb
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e.__traceback__ = None
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self.assertEqual(e.__traceback__, None)
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def testChainingAttrs(self):
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e = Exception()
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self.assertEqual(e.__context__, None)
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self.assertEqual(e.__cause__, None)
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e = TypeError()
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self.assertEqual(e.__context__, None)
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self.assertEqual(e.__cause__, None)
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class MyException(EnvironmentError):
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pass
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e = MyException()
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self.assertEqual(e.__context__, None)
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self.assertEqual(e.__cause__, None)
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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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self.assertRaises(RuntimeError, g)
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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.failUnless(str(Exception))
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self.failUnless(str(Exception))
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self.failUnless(str(Exception('a')))
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self.failUnless(str(Exception('a')))
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def testExceptionCleanupNames(self):
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# Make sure the local variable bound to the exception instance by
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# an "except" statement is only visible inside the except block.
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try:
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raise Exception()
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except Exception as e:
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self.failUnless(e)
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del e
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self.failIf('e' in locals())
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def testExceptionCleanupState(self):
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# Make sure exception state is cleaned up as soon as the except
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# block is left. See #2507
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class MyException(Exception):
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def __init__(self, obj):
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self.obj = obj
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class MyObj:
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pass
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def inner_raising_func():
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# Create some references in exception value and traceback
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local_ref = obj
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raise MyException(obj)
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obj = MyObj()
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wr = weakref.ref(obj)
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try:
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inner_raising_func()
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except MyException as e:
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pass
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obj = None
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obj = wr()
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self.failUnless(obj is None, "%s" % obj)
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def test_main():
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run_unittest(ExceptionTests)
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if __name__ == '__main__':
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unittest.main()
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