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bpo-46542: test_lib2to3 uses support.infinite_recursion() (GH-31035)
* 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>
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5 changed files with 47 additions and 23 deletions
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@ -20,6 +20,7 @@ import shutil
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import subprocess
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import sys
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import tempfile
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import test.support
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import unittest
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# Local imports
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@ -589,25 +590,31 @@ class TestParserIdempotency(support.TestCase):
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"""A cut-down version of pytree_idempotency.py."""
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def parse_file(self, filepath):
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if test.support.verbose:
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print(f"Parse file: {filepath}")
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with open(filepath, "rb") as fp:
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encoding = tokenize.detect_encoding(fp.readline)[0]
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self.assertIsNotNone(encoding,
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"can't detect encoding for %s" % filepath)
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with open(filepath, "r", encoding=encoding) as fp:
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source = fp.read()
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try:
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tree = driver.parse_string(source)
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except ParseError:
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try:
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tree = driver_no_print_statement.parse_string(source)
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except ParseError as err:
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self.fail('ParseError on file %s (%s)' % (filepath, err))
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new = str(tree)
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if new != source:
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print(diff_texts(source, new, filepath))
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self.fail("Idempotency failed: %s" % filepath)
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def test_all_project_files(self):
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for filepath in support.all_project_files():
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with open(filepath, "rb") as fp:
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encoding = tokenize.detect_encoding(fp.readline)[0]
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self.assertIsNotNone(encoding,
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"can't detect encoding for %s" % filepath)
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with open(filepath, "r", encoding=encoding) as fp:
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source = fp.read()
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try:
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tree = driver.parse_string(source)
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except ParseError:
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try:
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tree = driver_no_print_statement.parse_string(source)
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except ParseError as err:
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self.fail('ParseError on file %s (%s)' % (filepath, err))
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new = str(tree)
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if new != source:
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print(diff_texts(source, new, filepath))
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self.fail("Idempotency failed: %s" % filepath)
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with self.subTest(filepath=filepath):
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self.parse_file(filepath)
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def test_extended_unpacking(self):
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driver.parse_string("a, *b, c = x\n")
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