Failed test_write_filtered_python_package test case in ./python -We -m test -v test_zipfile

[furkanonder]

Bug report

======================================================================
FAIL: test_write_filtered_python_package (test.test_zipfile.test_core.PyZipFileTests.test_write_filtered_python_package)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/workspace/cpython/Lib/test/test_zipfile/test_core.py", line 1240, in test_write_filtered_python_package
    self.assertTrue('SyntaxError' not in reportStr)
AssertionError: False is not true

----------------------------------------------------------------------
Ran 287 tests in 17.715s

FAILED (failures=1, skipped=4)
test test_zipfile failed
test_zipfile failed (1 failure)

== Tests result: FAILURE ==

1 test failed:
    test_zipfile

Total duration: 17.9 sec
Tests result: FAILURE

Your environment

• CPython versions tested on: CPython 3.12.0a7+
• Operating system and architecture: Ubuntu 22.04.2 LTS | Linux-5.15.0-47-generic-x86_64-with-glibc2.35 little-endian

Linked PRs

• gh-104089: catch DeprecationWarning in test_fstring #104137

[sunmy2019]

Starts from 1ef61cf

Also fails for

./python -We -m test test_fstring

This is due to a syntax warning raised on an invalid escape sequence \{ \}.
It's a syntax error in -We.

Related Issue: #103786

Should be fixed by something like

        self.assertEqual(f'\{{\}}', '\\{\\}')

->

        with warnings.catch_warnings(record=True):
            self.assertEqual(eval(r"f'\{{\}}'"), '\\{\\}')

A helper function should be added here to assert the warning is raised.