cpython/Lib/test/test_traceback.py

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"""Test cases for traceback module"""
from _testcapi import traceback_print
from StringIO import StringIO
import sys
import unittest
from test.test_support import run_unittest, is_jython, Error
import traceback
class TracebackCases(unittest.TestCase):
# For now, a very minimal set of tests. I want to be sure that
# formatting of SyntaxErrors works based on changes for 2.1.
def get_exception_format(self, func, exc):
try:
func()
except exc, value:
return traceback.format_exception_only(exc, value)
else:
raise ValueError, "call did not raise exception"
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def syntax_error_with_caret(self):
compile("def fact(x):\n\treturn x!\n", "?", "exec")
def syntax_error_without_caret(self):
# XXX why doesn't compile raise the same traceback?
import test.badsyntax_nocaret
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def syntax_error_bad_indentation(self):
compile("def spam():\n print 1\n print 2", "?", "exec")
def test_caret(self):
err = self.get_exception_format(self.syntax_error_with_caret,
SyntaxError)
self.assert_(len(err) == 4)
self.assert_(err[1].strip() == "return x!")
self.assert_("^" in err[2]) # third line has caret
self.assert_(err[1].find("!") == err[2].find("^")) # in the right place
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def test_nocaret(self):
if is_jython:
# jython adds a caret in this case (why shouldn't it?)
return
err = self.get_exception_format(self.syntax_error_without_caret,
SyntaxError)
self.assert_(len(err) == 3)
self.assert_(err[1].strip() == "[x for x in x] = x")
def test_bad_indentation(self):
err = self.get_exception_format(self.syntax_error_bad_indentation,
IndentationError)
self.assert_(len(err) == 4)
self.assert_(err[1].strip() == "print 2")
self.assert_("^" in err[2])
self.assert_(err[1].find("2") == err[2].find("^"))
def test_bug737473(self):
import sys, os, tempfile, time
savedpath = sys.path[:]
testdir = tempfile.mkdtemp()
try:
sys.path.insert(0, testdir)
testfile = os.path.join(testdir, 'test_bug737473.py')
print >> open(testfile, 'w'), """
def test():
raise ValueError"""
if 'test_bug737473' in sys.modules:
del sys.modules['test_bug737473']
import test_bug737473
try:
test_bug737473.test()
except ValueError:
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# this loads source code to linecache
traceback.extract_tb(sys.exc_traceback)
# If this test runs too quickly, test_bug737473.py's mtime
# attribute will remain unchanged even if the file is rewritten.
# Consequently, the file would not reload. So, added a sleep()
# delay to assure that a new, distinct timestamp is written.
# Since WinME with FAT32 has multisecond resolution, more than
# three seconds are needed for this test to pass reliably :-(
time.sleep(4)
print >> open(testfile, 'w'), """
def test():
raise NotImplementedError"""
reload(test_bug737473)
try:
test_bug737473.test()
except NotImplementedError:
src = traceback.extract_tb(sys.exc_traceback)[-1][-1]
self.failUnlessEqual(src, 'raise NotImplementedError')
finally:
sys.path[:] = savedpath
for f in os.listdir(testdir):
os.unlink(os.path.join(testdir, f))
os.rmdir(testdir)
def test_base_exception(self):
# Test that exceptions derived from BaseException are formatted right
e = KeyboardInterrupt()
lst = traceback.format_exception_only(e.__class__, e)
self.assertEqual(lst, ['KeyboardInterrupt\n'])
# String exceptions are deprecated, but legal. The quirky form with
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# separate "type" and "value" tends to break things, because
# not isinstance(value, type)
# and a string cannot be the first argument to issubclass.
#
# Note that sys.last_type and sys.last_value do not get set if an
# exception is caught, so we sort of cheat and just emulate them.
#
# test_string_exception1 is equivalent to
#
# >>> raise "String Exception"
#
# test_string_exception2 is equivalent to
#
# >>> raise "String Exception", "String Value"
#
def test_string_exception1(self):
str_type = "String Exception"
err = traceback.format_exception_only(str_type, None)
self.assertEqual(len(err), 1)
self.assertEqual(err[0], str_type + '\n')
def test_string_exception2(self):
str_type = "String Exception"
str_value = "String Value"
err = traceback.format_exception_only(str_type, str_value)
self.assertEqual(len(err), 1)
self.assertEqual(err[0], str_type + ': ' + str_value + '\n')
def test_format_exception_only_bad__str__(self):
class X(Exception):
def __str__(self):
1/0
err = traceback.format_exception_only(X, X())
self.assertEqual(len(err), 1)
str_value = '<unprintable %s object>' % X.__name__
self.assertEqual(err[0], X.__name__ + ': ' + str_value + '\n')
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def test_without_exception(self):
err = traceback.format_exception_only(None, None)
self.assertEqual(err, ['None\n'])
class TracebackFormatTests(unittest.TestCase):
Merged revisions 71058,71149-71150,71212,71214-71216,71222,71225,71234,71237-71238,71240-71241,71243,71249,71251 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r71058 | georg.brandl | 2009-04-02 20:09:04 +0200 (Do, 02 Apr 2009) | 3 lines PyErr_NormalizeException may not set an error, so convert the PyErr_SetObject call on hitting the recursion limit into just assigning it to the arguments provided. ........ r71149 | georg.brandl | 2009-04-04 15:42:39 +0200 (Sa, 04 Apr 2009) | 1 line #5642: clarify map() compatibility to the builtin. ........ r71150 | georg.brandl | 2009-04-04 15:45:49 +0200 (Sa, 04 Apr 2009) | 1 line #5601: clarify that webbrowser is not meant for file names. ........ r71212 | georg.brandl | 2009-04-05 12:24:20 +0200 (So, 05 Apr 2009) | 1 line #1742837: expand HTTP server docs, and fix SocketServer ones to document methods as methods, not functions. ........ r71214 | georg.brandl | 2009-04-05 12:29:57 +0200 (So, 05 Apr 2009) | 1 line Normalize spelling of Mac OS X. ........ r71215 | georg.brandl | 2009-04-05 12:32:26 +0200 (So, 05 Apr 2009) | 1 line Avoid sure signs of a diseased mind. ........ r71216 | georg.brandl | 2009-04-05 12:41:02 +0200 (So, 05 Apr 2009) | 1 line #1718017: document the relation of os.path and the posixpath, ntpath etc. modules better. ........ r71222 | georg.brandl | 2009-04-05 13:07:14 +0200 (So, 05 Apr 2009) | 1 line #5615: make it possible to configure --without-threads again. ........ r71225 | georg.brandl | 2009-04-05 13:54:07 +0200 (So, 05 Apr 2009) | 1 line #5580: no need to use parentheses when converterr() argument is actually a type description. ........ r71234 | georg.brandl | 2009-04-05 15:16:35 +0200 (So, 05 Apr 2009) | 1 line Whitespace normalization. ........ r71237 | georg.brandl | 2009-04-05 16:24:52 +0200 (So, 05 Apr 2009) | 1 line #1326077: fix traceback formatting of SyntaxErrors. This fixes two differences with formatting coming from Python: a) the reproduction of location details in the error message if no line text is given, b) the prefixing of the last line by one space. ........ r71238 | georg.brandl | 2009-04-05 16:25:41 +0200 (So, 05 Apr 2009) | 1 line Add NEWS entry for r71237. ........ r71240 | georg.brandl | 2009-04-05 16:40:06 +0200 (So, 05 Apr 2009) | 1 line #5370: doc update about unpickling objects with custom __getattr__ etc. methods. ........ r71241 | georg.brandl | 2009-04-05 16:48:49 +0200 (So, 05 Apr 2009) | 1 line #5471: fix expanduser() for $HOME set to "/". ........ r71243 | georg.brandl | 2009-04-05 17:14:29 +0200 (So, 05 Apr 2009) | 1 line #5432: make plistlib docstring a raw string, since it contains examples with backslash escapes. ........ r71249 | georg.brandl | 2009-04-05 18:30:43 +0200 (So, 05 Apr 2009) | 1 line #5444: adapt make.bat to new htmlhelp output file name. ........ r71251 | georg.brandl | 2009-04-05 19:17:42 +0200 (So, 05 Apr 2009) | 1 line #5298: clarify docs about GIL by using more consistent wording. ........
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def test_traceback_format(self):
try:
raise KeyError('blah')
except KeyError:
type_, value, tb = sys.exc_info()
traceback_fmt = 'Traceback (most recent call last):\n' + \
''.join(traceback.format_tb(tb))
file_ = StringIO()
traceback_print(tb, file_)
python_fmt = file_.getvalue()
else:
raise Error("unable to create test traceback string")
# Make sure that Python and the traceback module format the same thing
self.assertEquals(traceback_fmt, python_fmt)
# Make sure that the traceback is properly indented.
Merged revisions 71058,71149-71150,71212,71214-71216,71222,71225,71234,71237-71238,71240-71241,71243,71249,71251 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r71058 | georg.brandl | 2009-04-02 20:09:04 +0200 (Do, 02 Apr 2009) | 3 lines PyErr_NormalizeException may not set an error, so convert the PyErr_SetObject call on hitting the recursion limit into just assigning it to the arguments provided. ........ r71149 | georg.brandl | 2009-04-04 15:42:39 +0200 (Sa, 04 Apr 2009) | 1 line #5642: clarify map() compatibility to the builtin. ........ r71150 | georg.brandl | 2009-04-04 15:45:49 +0200 (Sa, 04 Apr 2009) | 1 line #5601: clarify that webbrowser is not meant for file names. ........ r71212 | georg.brandl | 2009-04-05 12:24:20 +0200 (So, 05 Apr 2009) | 1 line #1742837: expand HTTP server docs, and fix SocketServer ones to document methods as methods, not functions. ........ r71214 | georg.brandl | 2009-04-05 12:29:57 +0200 (So, 05 Apr 2009) | 1 line Normalize spelling of Mac OS X. ........ r71215 | georg.brandl | 2009-04-05 12:32:26 +0200 (So, 05 Apr 2009) | 1 line Avoid sure signs of a diseased mind. ........ r71216 | georg.brandl | 2009-04-05 12:41:02 +0200 (So, 05 Apr 2009) | 1 line #1718017: document the relation of os.path and the posixpath, ntpath etc. modules better. ........ r71222 | georg.brandl | 2009-04-05 13:07:14 +0200 (So, 05 Apr 2009) | 1 line #5615: make it possible to configure --without-threads again. ........ r71225 | georg.brandl | 2009-04-05 13:54:07 +0200 (So, 05 Apr 2009) | 1 line #5580: no need to use parentheses when converterr() argument is actually a type description. ........ r71234 | georg.brandl | 2009-04-05 15:16:35 +0200 (So, 05 Apr 2009) | 1 line Whitespace normalization. ........ r71237 | georg.brandl | 2009-04-05 16:24:52 +0200 (So, 05 Apr 2009) | 1 line #1326077: fix traceback formatting of SyntaxErrors. This fixes two differences with formatting coming from Python: a) the reproduction of location details in the error message if no line text is given, b) the prefixing of the last line by one space. ........ r71238 | georg.brandl | 2009-04-05 16:25:41 +0200 (So, 05 Apr 2009) | 1 line Add NEWS entry for r71237. ........ r71240 | georg.brandl | 2009-04-05 16:40:06 +0200 (So, 05 Apr 2009) | 1 line #5370: doc update about unpickling objects with custom __getattr__ etc. methods. ........ r71241 | georg.brandl | 2009-04-05 16:48:49 +0200 (So, 05 Apr 2009) | 1 line #5471: fix expanduser() for $HOME set to "/". ........ r71243 | georg.brandl | 2009-04-05 17:14:29 +0200 (So, 05 Apr 2009) | 1 line #5432: make plistlib docstring a raw string, since it contains examples with backslash escapes. ........ r71249 | georg.brandl | 2009-04-05 18:30:43 +0200 (So, 05 Apr 2009) | 1 line #5444: adapt make.bat to new htmlhelp output file name. ........ r71251 | georg.brandl | 2009-04-05 19:17:42 +0200 (So, 05 Apr 2009) | 1 line #5298: clarify docs about GIL by using more consistent wording. ........
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tb_lines = python_fmt.splitlines()
self.assertEquals(len(tb_lines), 3)
banner, location, source_line = tb_lines
self.assert_(banner.startswith('Traceback'))
self.assert_(location.startswith(' File'))
self.assert_(source_line.startswith(' raise'))
def test_main():
run_unittest(TracebackCases, TracebackFormatTests)
if __name__ == "__main__":
test_main()