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"""Test cases for traceback module"""
from _testcapi import traceback_print, exception_print
from io import StringIO
import sys
import unittest
import re
from test.support import run_unittest, is_jython, Error, captured_output
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 SyntaxTracebackCases(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'))
cause_message = (
"\nThe above exception was the direct cause "
"of the following exception:\n\n")
context_message = (
"\nDuring handling of the above exception, "
"another exception occurred:\n\n")
boundaries = re.compile(
'(%s|%s)' % (re.escape(cause_message), re.escape(context_message)))
class BaseExceptionReportingTests:
def get_exception(self, exception_or_callable):
if isinstance(exception_or_callable, Exception):
return exception_or_callable
try:
exception_or_callable()
except Exception as e:
return e
def zero_div(self):
1/0 # In zero_div
def check_zero_div(self, msg):
lines = msg.splitlines()
self.assert_(lines[-3].startswith(' File'))
self.assert_('1/0 # In zero_div' in lines[-2], lines[-2])
self.assert_(lines[-1].startswith('ZeroDivisionError'), lines[-1])
def test_simple(self):
try:
1/0 # Marker
except ZeroDivisionError as _:
e = _
lines = self.get_report(e).splitlines()
self.assertEquals(len(lines), 4)
self.assert_(lines[0].startswith('Traceback'))
self.assert_(lines[1].startswith(' File'))
self.assert_('1/0 # Marker' in lines[2])
self.assert_(lines[3].startswith('ZeroDivisionError'))
def test_cause(self):
def inner_raise():
try:
self.zero_div()
except ZeroDivisionError as e:
raise KeyError from e
def outer_raise():
inner_raise() # Marker
blocks = boundaries.split(self.get_report(outer_raise))
self.assertEquals(len(blocks), 3)
self.assertEquals(blocks[1], cause_message)
self.check_zero_div(blocks[0])
self.assert_('inner_raise() # Marker' in blocks[2])
def test_context(self):
def inner_raise():
try:
self.zero_div()
except ZeroDivisionError:
raise KeyError
def outer_raise():
inner_raise() # Marker
blocks = boundaries.split(self.get_report(outer_raise))
self.assertEquals(len(blocks), 3)
self.assertEquals(blocks[1], context_message)
self.check_zero_div(blocks[0])
self.assert_('inner_raise() # Marker' in blocks[2])
def test_cause_recursive(self):
def inner_raise():
try:
try:
self.zero_div()
except ZeroDivisionError as e:
z = e
raise KeyError from e
except KeyError as e:
raise z from e
def outer_raise():
inner_raise() # Marker
blocks = boundaries.split(self.get_report(outer_raise))
self.assertEquals(len(blocks), 3)
self.assertEquals(blocks[1], cause_message)
# The first block is the KeyError raised from the ZeroDivisionError
self.assert_('raise KeyError from e' in blocks[0])
self.assert_('1/0' not in blocks[0])
# The second block (apart from the boundary) is the ZeroDivisionError
# re-raised from the KeyError
self.assert_('inner_raise() # Marker' in blocks[2])
self.check_zero_div(blocks[2])
class PyExcReportingTests(BaseExceptionReportingTests, unittest.TestCase):
#
# This checks reporting through the 'traceback' module, with both
# format_exception() and print_exception().
#
def get_report(self, e):
e = self.get_exception(e)
s = ''.join(
traceback.format_exception(type(e), e, e.__traceback__))
with captured_output("stderr") as sio:
traceback.print_exception(type(e), e, e.__traceback__)
self.assertEquals(sio.getvalue(), s)
return s
class CExcReportingTests(BaseExceptionReportingTests, unittest.TestCase):
#
# This checks built-in reporting by the interpreter.
#
def get_report(self, e):
e = self.get_exception(e)
with captured_output("stderr") as s:
exception_print(e)
return s.getvalue()
def test_main():
run_unittest(__name__)
if __name__ == "__main__":
test_main()
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