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"""Test cases for traceback module"""
from _testcapi import traceback_print
from io import StringIO
import sys
import unittest
from test.test_support import run_unittest, is_jython, Error
import traceback
try:
raise KeyError
except KeyError:
type_, value, tb = sys.exc_info()
file_ = StringIO()
traceback_print(tb, file_)
example_traceback = file_.getvalue()
else:
raise Error("unable to create test traceback string")
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 as value:
return traceback.format_exception_only(exc, value)
else:
raise ValueError("call did not raise exception")
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
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.assertEqual(len(err), 4)
self.assert_(err[1].strip() == "return x!")
self.assert_("^" in err[2]) # third line has caret
self.assertEqual(err[1].find("!"), err[2].find("^")) # in the right place
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.assertEqual(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.assertEqual(len(err), 4)
self.assertEqual(err[1].strip(), "print(2)")
self.assert_("^" in err[2])
self.assertEqual(err[1].find(")"), err[2].find("^"))
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'])
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__
if X.__module__ in ('__main__', 'builtins'):
str_name = X.__name__
else:
str_name = '.'.join([X.__module__, X.__name__])
self.assertEqual(err[0], "%s: %s\n" % (str_name, str_value))
def test_without_exception(self):
err = traceback.format_exception_only(None, None)
self.assertEqual(err, ['None\n'])
class TracebackFormatTests(unittest.TestCase):
def test_traceback_indentation(self):
# Make sure that the traceback is properly indented.
tb_lines = example_traceback.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()
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