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vstinner@DESKTOP-DK7VBIL C:\vstinner\python\master>type bisect3
test.test_signal.RaiseSignalTest.test_handler
test.test_interpreters.TestInterpreterAttrs.test_main_id
test.test_interpreters.TestInterpreterClose.test_from_sibling
vstinner@DESKTOP-DK7VBIL C:\vstinner\python\master>python -m test test_interpreters test_signal --matchfile=bisect3 -v
Running Debug|x64 interpreter...
== CPython 3.10.0a7+ (heads/master:6bd9288b80, Apr 27 2021, 22:54:42) [MSC v.1928 64 bit (AMD64)]
== Windows-10-10.0.19042-SP0 little-endian
== cwd: C:\vstinner\python\master\build\test_python_5756æ
== CPU count: 2
== encodings: locale=cp1252, FS=utf-8
0:00:00 Run tests sequentially
0:00:00 [1/2] test_interpreters
test_main_id (test.test_interpreters.TestInterpreterAttrs) ... ok
test_from_sibling (test.test_interpreters.TestInterpreterClose) ... ok
----------------------------------------------------------------------
Ran 2 tests in 0.277s
OK
0:00:00 [2/2] test_signal
test_handler (test.test_signal.RaiseSignalTest) ... ERROR
======================================================================
ERROR: test_handler (test.test_signal.RaiseSignalTest)
----------------------------------------------------------------------
Traceback (most recent call last):
 File "C:\vstinner\python\master\lib\signal.py", line 47, in signal
 handler = _signal.signal(_enum_to_int(signalnum), _enum_to_int(handler))
TypeError: signal handler must be signal.SIG_IGN, signal.SIG_DFL, or a callable object
----------------------------------------------------------------------
Ran 1 test in 0.004s
FAILED (errors=1)
test test_signal failed
test_signal failed
== Tests result: FAILURE ==
1 test OK.
1 test failed:
 test_signal
Total duration: 689 ms
Tests result: FAILURE

See also bpo-43962: "test_interpreters: when TestInterpreterAttrs.test_id_type() is run alone, it fails with an assertion error".

See also bpo-43955: "Windows: Running the Python test suite sequentially is interrupted by (Pdb) prompt".

This issue is a follow-up of bpo-41713:
commit 7f9b25a21ab95f8cf8d663396993766307be475c
Author: Victor Stinner <vstinner@python.org>
Date: Tue Nov 17 23:28:25 2020 +0100
 bpo-41713: Port _signal module to multi-phase init (GH-23355)
 
 Port the _signal extension module to the multi-phase initialization
 API (PEP 489).
 
 Co-Authored-By: Mohamed Koubaa <koubaa.m@gmail.com>

New changeset a09766deab5aff549f40f27080895e148af922ed by Victor Stinner in branch 'master':
bpo-43963: Fix import _signal in subinterpreters (GH-25674)
https://github.com/python/cpython/commit/a09766deab5aff549f40f27080895e148af922ed

New changeset a5e64444e6df7d1d498576bab26deaddc288a7bd by Victor Stinner in branch 'master':
bpo-43963: Add _signal module state (GH-25676)
https://github.com/python/cpython/commit/a5e64444e6df7d1d498576bab26deaddc288a7bd

Sorry if I'm not supposed to open closed issues, however I believe there's a typo in the whatsnew page for this. In https://docs.python.org/3.10/whatsnew/changelog.html#changelog, the entry for bpo-43963 says "Importing the signal module in a subinterpreter has no longer side effects.", however I believe it should be "Importing the signal module in a subinterpreter no longer has side effects". The only difference is that "has" is moved after "no longer" instead of before.