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bpo-46542: test_lib2to3 uses support.infinite_recursion() (GH-31035)

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* bpo-46542: test_lib2to3 uses support.infinite_recursion()

Fix a Python crash in test_lib2to3 when using Python built in debug
mode: limit the recursion limit.

The test_all_project_files() test of test_lib2to3 now uses the
test.support.infinite_recursion() context manager when processing the
infinite_recursion.py file to prevent a crash when Python is built in
debug mode.

The two test_all_project_files() tests now use subTest() and log the
refactored/parsed filename (if test_lib2to3 is run in verbose mode).

* Update Lib/lib2to3/tests/data/infinite_recursion.py

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>

Co-authored-by: Łukasz Langa <lukasz@langa.pl>
Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
This commit is contained in:
Victor Stinner 2022-01-31 18:46:09 +01:00 • committed by GitHub
parent 768569325a
commit ee0ac328d3
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5 changed files with 47 additions and 23 deletions
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41
Lib/lib2to3/tests/test_parser.py
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@ -20,6 +20,7 @@ import shutil
import subprocess
import sys
import tempfile
import test.support
import unittest
# Local imports
@ -589,25 +590,31 @@ class TestParserIdempotency(support.TestCase):
"""A cut-down version of pytree_idempotency.py."""
def parse_file(self, filepath):
if test.support.verbose:
print(f"Parse file: {filepath}")
with open(filepath, "rb") as fp:
encoding = tokenize.detect_encoding(fp.readline)[0]
self.assertIsNotNone(encoding,
"can't detect encoding for %s" % filepath)
with open(filepath, "r", encoding=encoding) as fp:
source = fp.read()
try:
tree = driver.parse_string(source)
except ParseError:
try:
tree = driver_no_print_statement.parse_string(source)
except ParseError as err:
self.fail('ParseError on file %s (%s)' % (filepath, err))
new = str(tree)
if new != source:
print(diff_texts(source, new, filepath))
self.fail("Idempotency failed: %s" % filepath)
def test_all_project_files(self):
for filepath in support.all_project_files():
with open(filepath, "rb") as fp:
encoding = tokenize.detect_encoding(fp.readline)[0]
self.assertIsNotNone(encoding,
"can't detect encoding for %s" % filepath)
with open(filepath, "r", encoding=encoding) as fp:
source = fp.read()
try:
tree = driver.parse_string(source)
except ParseError:
try:
tree = driver_no_print_statement.parse_string(source)
except ParseError as err:
self.fail('ParseError on file %s (%s)' % (filepath, err))
new = str(tree)
if new != source:
print(diff_texts(source, new, filepath))
self.fail("Idempotency failed: %s" % filepath)
with self.subTest(filepath=filepath):
self.parse_file(filepath)
def test_extended_unpacking(self):
driver.parse_string("a, *b, c = x\n")