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352 lines
13 KiB
Python
352 lines
13 KiB
Python
"""Test cases for traceback module"""
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from _testcapi import traceback_print, exception_print
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from io import StringIO
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import sys
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import unittest
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import re
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from test.support import run_unittest, Error, captured_output
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from test.support import TESTFN, unlink
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import traceback
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class SyntaxTracebackCases(unittest.TestCase):
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# For now, a very minimal set of tests. I want to be sure that
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# formatting of SyntaxErrors works based on changes for 2.1.
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def get_exception_format(self, func, exc):
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try:
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func()
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except exc as value:
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return traceback.format_exception_only(exc, value)
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else:
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raise ValueError("call did not raise exception")
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def syntax_error_with_caret(self):
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compile("def fact(x):\n\treturn x!\n", "?", "exec")
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def syntax_error_with_caret_2(self):
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compile("1 +\n", "?", "exec")
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def syntax_error_bad_indentation(self):
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compile("def spam():\n print(1)\n print(2)", "?", "exec")
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def test_caret(self):
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err = self.get_exception_format(self.syntax_error_with_caret,
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SyntaxError)
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self.assertEqual(len(err), 4)
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self.assertTrue(err[1].strip() == "return x!")
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self.assertIn("^", err[2]) # third line has caret
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self.assertEqual(err[1].find("!"), err[2].find("^")) # in the right place
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err = self.get_exception_format(self.syntax_error_with_caret_2,
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SyntaxError)
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self.assertIn("^", err[2]) # third line has caret
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self.assertTrue(err[2].count('\n') == 1) # and no additional newline
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self.assertTrue(err[1].find("+") == err[2].find("^")) # in the right place
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def test_nocaret(self):
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exc = SyntaxError("error", ("x.py", 23, None, "bad syntax"))
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err = traceback.format_exception_only(SyntaxError, exc)
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self.assertEqual(len(err), 3)
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self.assertEqual(err[1].strip(), "bad syntax")
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def test_bad_indentation(self):
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err = self.get_exception_format(self.syntax_error_bad_indentation,
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IndentationError)
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self.assertEqual(len(err), 4)
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self.assertEqual(err[1].strip(), "print(2)")
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self.assertIn("^", err[2])
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self.assertEqual(err[1].find(")"), err[2].find("^"))
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def test_base_exception(self):
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# Test that exceptions derived from BaseException are formatted right
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e = KeyboardInterrupt()
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lst = traceback.format_exception_only(e.__class__, e)
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self.assertEqual(lst, ['KeyboardInterrupt\n'])
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def test_format_exception_only_bad__str__(self):
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class X(Exception):
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def __str__(self):
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1/0
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err = traceback.format_exception_only(X, X())
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self.assertEqual(len(err), 1)
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str_value = '<unprintable %s object>' % X.__name__
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if X.__module__ in ('__main__', 'builtins'):
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str_name = X.__name__
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else:
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str_name = '.'.join([X.__module__, X.__name__])
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self.assertEqual(err[0], "%s: %s\n" % (str_name, str_value))
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def test_without_exception(self):
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err = traceback.format_exception_only(None, None)
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self.assertEqual(err, ['None\n'])
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def test_encoded_file(self):
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# Test that tracebacks are correctly printed for encoded source files:
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# - correct line number (Issue2384)
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# - respect file encoding (Issue3975)
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import tempfile, sys, subprocess, os
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# The spawned subprocess has its stdout redirected to a PIPE, and its
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# encoding may be different from the current interpreter, on Windows
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# at least.
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process = subprocess.Popen([sys.executable, "-c",
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"import sys; print(sys.stdout.encoding)"],
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stdout=subprocess.PIPE,
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stderr=subprocess.STDOUT)
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stdout, stderr = process.communicate()
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output_encoding = str(stdout, 'ascii').splitlines()[0]
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def do_test(firstlines, message, charset, lineno):
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# Raise the message in a subprocess, and catch the output
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try:
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output = open(TESTFN, "w", encoding=charset)
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output.write("""{0}if 1:
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import traceback;
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raise RuntimeError('{1}')
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""".format(firstlines, message))
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output.close()
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process = subprocess.Popen([sys.executable, TESTFN],
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stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
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stdout, stderr = process.communicate()
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stdout = stdout.decode(output_encoding).splitlines()
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finally:
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unlink(TESTFN)
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# The source lines are encoded with the 'backslashreplace' handler
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encoded_message = message.encode(output_encoding,
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'backslashreplace')
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# and we just decoded them with the output_encoding.
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message_ascii = encoded_message.decode(output_encoding)
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err_line = "raise RuntimeError('{0}')".format(message_ascii)
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err_msg = "RuntimeError: {0}".format(message_ascii)
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self.assertIn(("line %s" % lineno), stdout[1],
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"Invalid line number: {0!r} instead of {1}".format(
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stdout[1], lineno))
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self.assertTrue(stdout[2].endswith(err_line),
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"Invalid traceback line: {0!r} instead of {1!r}".format(
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stdout[2], err_line))
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self.assertTrue(stdout[3] == err_msg,
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"Invalid error message: {0!r} instead of {1!r}".format(
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stdout[3], err_msg))
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do_test("", "foo", "ascii", 3)
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for charset in ("ascii", "iso-8859-1", "utf-8", "GBK"):
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if charset == "ascii":
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text = "foo"
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elif charset == "GBK":
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text = "\u4E02\u5100"
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else:
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text = "h\xe9 ho"
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do_test("# coding: {0}\n".format(charset),
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text, charset, 4)
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do_test("#!shebang\n# coding: {0}\n".format(charset),
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text, charset, 5)
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class TracebackFormatTests(unittest.TestCase):
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def test_traceback_format(self):
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try:
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raise KeyError('blah')
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except KeyError:
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type_, value, tb = sys.exc_info()
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traceback_fmt = 'Traceback (most recent call last):\n' + \
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''.join(traceback.format_tb(tb))
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file_ = StringIO()
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traceback_print(tb, file_)
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python_fmt = file_.getvalue()
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else:
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raise Error("unable to create test traceback string")
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# Make sure that Python and the traceback module format the same thing
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self.assertEqual(traceback_fmt, python_fmt)
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# Make sure that the traceback is properly indented.
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tb_lines = python_fmt.splitlines()
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self.assertEqual(len(tb_lines), 3)
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banner, location, source_line = tb_lines
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self.assertTrue(banner.startswith('Traceback'))
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self.assertTrue(location.startswith(' File'))
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self.assertTrue(source_line.startswith(' raise'))
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cause_message = (
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"\nThe above exception was the direct cause "
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"of the following exception:\n\n")
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context_message = (
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"\nDuring handling of the above exception, "
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"another exception occurred:\n\n")
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boundaries = re.compile(
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'(%s|%s)' % (re.escape(cause_message), re.escape(context_message)))
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class BaseExceptionReportingTests:
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def get_exception(self, exception_or_callable):
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if isinstance(exception_or_callable, Exception):
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return exception_or_callable
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try:
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exception_or_callable()
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except Exception as e:
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return e
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def zero_div(self):
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1/0 # In zero_div
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def check_zero_div(self, msg):
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lines = msg.splitlines()
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self.assertTrue(lines[-3].startswith(' File'))
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self.assertIn('1/0 # In zero_div', lines[-2])
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self.assertTrue(lines[-1].startswith('ZeroDivisionError'), lines[-1])
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def test_simple(self):
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try:
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1/0 # Marker
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except ZeroDivisionError as _:
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e = _
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lines = self.get_report(e).splitlines()
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self.assertEqual(len(lines), 4)
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self.assertTrue(lines[0].startswith('Traceback'))
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self.assertTrue(lines[1].startswith(' File'))
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self.assertIn('1/0 # Marker', lines[2])
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self.assertTrue(lines[3].startswith('ZeroDivisionError'))
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def test_cause(self):
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def inner_raise():
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try:
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self.zero_div()
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except ZeroDivisionError as e:
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raise KeyError from e
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def outer_raise():
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inner_raise() # Marker
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blocks = boundaries.split(self.get_report(outer_raise))
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self.assertEqual(len(blocks), 3)
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self.assertEqual(blocks[1], cause_message)
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self.check_zero_div(blocks[0])
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self.assertIn('inner_raise() # Marker', blocks[2])
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def test_context(self):
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def inner_raise():
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try:
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self.zero_div()
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except ZeroDivisionError:
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raise KeyError
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def outer_raise():
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inner_raise() # Marker
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blocks = boundaries.split(self.get_report(outer_raise))
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self.assertEqual(len(blocks), 3)
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self.assertEqual(blocks[1], context_message)
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self.check_zero_div(blocks[0])
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self.assertIn('inner_raise() # Marker', blocks[2])
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def test_context_suppression(self):
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try:
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try:
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raise Exception
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except:
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raise ZeroDivisionError from None
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except ZeroDivisionError as _:
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e = _
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lines = self.get_report(e).splitlines()
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self.assertEqual(len(lines), 4)
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self.assertTrue(lines[0].startswith('Traceback'))
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self.assertTrue(lines[1].startswith(' File'))
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self.assertIn('ZeroDivisionError from None', lines[2])
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self.assertTrue(lines[3].startswith('ZeroDivisionError'))
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def test_cause_and_context(self):
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# When both a cause and a context are set, only the cause should be
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# displayed and the context should be muted.
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def inner_raise():
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try:
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self.zero_div()
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except ZeroDivisionError as _e:
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e = _e
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try:
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xyzzy
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except NameError:
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raise KeyError from e
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def outer_raise():
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inner_raise() # Marker
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blocks = boundaries.split(self.get_report(outer_raise))
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self.assertEqual(len(blocks), 3)
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self.assertEqual(blocks[1], cause_message)
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self.check_zero_div(blocks[0])
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self.assertIn('inner_raise() # Marker', blocks[2])
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def test_cause_recursive(self):
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def inner_raise():
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try:
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try:
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self.zero_div()
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except ZeroDivisionError as e:
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z = e
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raise KeyError from e
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except KeyError as e:
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raise z from e
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def outer_raise():
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inner_raise() # Marker
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blocks = boundaries.split(self.get_report(outer_raise))
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self.assertEqual(len(blocks), 3)
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self.assertEqual(blocks[1], cause_message)
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# The first block is the KeyError raised from the ZeroDivisionError
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self.assertIn('raise KeyError from e', blocks[0])
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self.assertNotIn('1/0', blocks[0])
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# The second block (apart from the boundary) is the ZeroDivisionError
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# re-raised from the KeyError
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self.assertIn('inner_raise() # Marker', blocks[2])
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self.check_zero_div(blocks[2])
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def test_syntax_error_offset_at_eol(self):
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# See #10186.
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def e():
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raise SyntaxError('', ('', 0, 5, 'hello'))
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msg = self.get_report(e).splitlines()
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self.assertEqual(msg[-2], " ^")
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def e():
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exec("x = 5 | 4 |")
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msg = self.get_report(e).splitlines()
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self.assertEqual(msg[-2], ' ^')
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class PyExcReportingTests(BaseExceptionReportingTests, unittest.TestCase):
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#
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# This checks reporting through the 'traceback' module, with both
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# format_exception() and print_exception().
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#
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def get_report(self, e):
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e = self.get_exception(e)
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s = ''.join(
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traceback.format_exception(type(e), e, e.__traceback__))
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with captured_output("stderr") as sio:
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traceback.print_exception(type(e), e, e.__traceback__)
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self.assertEqual(sio.getvalue(), s)
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return s
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class CExcReportingTests(BaseExceptionReportingTests, unittest.TestCase):
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#
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# This checks built-in reporting by the interpreter.
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#
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def get_report(self, e):
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e = self.get_exception(e)
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with captured_output("stderr") as s:
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exception_print(e)
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return s.getvalue()
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def test_main():
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run_unittest(__name__)
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if __name__ == "__main__":
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test_main()
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