https://www.python.org/ftp/python/3.9.0/python-3.9.0b1-amd64.exe

C:\Python39>python.exe -m test test_deque -v
== CPython 3.9.0b1 (tags/v3.9.0b1:97fe9cf, May 19 2020, 09:02:07) [MSC v.1924 64 bit (AMD64)]
== Windows-10-10.0.18362-SP0 little-endian
== cwd: C:\Users\jhong\AppData\Local\Temp\test_python_3376
== CPU count: 4
== encodings: locale=cp936, FS=utf-8
0:00:00 Run tests sequentially
0:00:00 [1/1] test_deque
test_add (test.test_deque.TestBasic) ... ok
test_basics (test.test_deque.TestBasic) ... ok
test_big_queue_popleft (test.test_deque.TestBasic) ... ok
test_big_queue_popright (test.test_deque.TestBasic) ... ok
test_big_stack_left (test.test_deque.TestBasic) ... ok
test_big_stack_right (test.test_deque.TestBasic) ... ok
test_clear (test.test_deque.TestBasic) ... ok
test_comparisons (test.test_deque.TestBasic) ... ok
test_container_iterator (test.test_deque.TestBasic) ... ok
test_contains (test.test_deque.TestBasic) ... ok
test_contains_count_stop_crashes (test.test_deque.TestBasic) ... ok
test_copy (test.test_deque.TestBasic) ... ok
test_copy_method (test.test_deque.TestBasic) ... ok
test_count (test.test_deque.TestBasic) ... ok
test_deepcopy (test.test_deque.TestBasic) ... ok
test_delitem (test.test_deque.TestBasic) ... ok
test_extend (test.test_deque.TestBasic) ... ok
test_extendleft (test.test_deque.TestBasic) ... ok
test_gc_doesnt_blowup (test.test_deque.TestBasic) ... ok
test_getitem (test.test_deque.TestBasic) ... ok
test_hash (test.test_deque.TestBasic) ... ok
test_iadd (test.test_deque.TestBasic) ... ok
test_imul (test.test_deque.TestBasic) ... ok
test_index (test.test_deque.TestBasic) ... ok
test_index_bug_24913 (test.test_deque.TestBasic) ... ok
test_init (test.test_deque.TestBasic) ... ok
test_insert (test.test_deque.TestBasic) ... ok
test_insert_bug_26194 (test.test_deque.TestBasic) ... ok
test_iterator_pickle (test.test_deque.TestBasic) ... ok
test_len (test.test_deque.TestBasic) ... ok
test_long_steadystate_queue_popleft (test.test_deque.TestBasic) ... ok
test_long_steadystate_queue_popright (test.test_deque.TestBasic) ... ok
test_maxlen (test.test_deque.TestBasic) ... ok
test_maxlen_attribute (test.test_deque.TestBasic) ... ok
test_maxlen_zero (test.test_deque.TestBasic) ... ok
test_mul (test.test_deque.TestBasic) ... ok
test_pickle (test.test_deque.TestBasic) ... ok
test_pickle_recursive (test.test_deque.TestBasic) ... ok
test_print (test.test_deque.TestBasic) ... ok
test_remove (test.test_deque.TestBasic) ... ok
test_repr (test.test_deque.TestBasic) ... ok
test_reverse (test.test_deque.TestBasic) ... ok
test_reversed (test.test_deque.TestBasic) ... ok
test_reversed_new (test.test_deque.TestBasic) ... ok
test_rotate (test.test_deque.TestBasic) ... ok
test_roundtrip_iter_init (test.test_deque.TestBasic) ... ok
test_setitem (test.test_deque.TestBasic) ... ok
test_sizeof (test.test_deque.TestBasic) ... ERROR
test_underflow (test.test_deque.TestBasic) ... ok
test_constructor (test.test_deque.TestVariousIteratorArgs) ... ok
test_iter_with_altered_data (test.test_deque.TestVariousIteratorArgs) ... ok
test_runtime_error_on_empty_deque (test.test_deque.TestVariousIteratorArgs) ... ok
test_basics (test.test_deque.TestSubclass) ... ok
test_bug_31608 (test.test_deque.TestSubclass) ... ok
test_copy_pickle (test.test_deque.TestSubclass) ... ok
test_pickle_recursive (test.test_deque.TestSubclass) ... ok
test_strange_subclass (test.test_deque.TestSubclass) ... ok
test_weakref (test.test_deque.TestSubclass) ... ok
test_subclass_with_kwargs (test.test_deque.TestSubclassWithKwargs) ... ok
test_addmul (test.test_deque.TestSequence) ... ok
test_bigrepeat (test.test_deque.TestSequence) ... ok
test_constructors (test.test_deque.TestSequence) ... ok
test_contains (test.test_deque.TestSequence) ... ok
test_contains_fake (test.test_deque.TestSequence) ... ok
test_contains_order (test.test_deque.TestSequence) ... ok
test_count (test.test_deque.TestSequence) ... ok
test_free_after_iterating (test.test_deque.TestSequence) ... skipped "Exhausted deque iterator doesn't free a deque"
test_getitem (test.test_deque.TestSequence) ... ok
test_getitemoverwriteiter (test.test_deque.TestSequence) ... ok
test_getslice (test.test_deque.TestSequence) ... ok
test_iadd (test.test_deque.TestSequence) ... ok
test_imul (test.test_deque.TestSequence) ... ok
test_index (test.test_deque.TestSequence) ... ok
test_len (test.test_deque.TestSequence) ... ok
test_minmax (test.test_deque.TestSequence) ... ok
test_pickle (test.test_deque.TestSequence) ... ok
test_repeat (test.test_deque.TestSequence) ... ok
test_subscript (test.test_deque.TestSequence) ... ok
test_truth (test.test_deque.TestSequence) ... ok

======================================================================
ERROR: test_sizeof (test.test_deque.TestBasic)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "C:\Python39\lib\test\test_deque.py", line 781, in test_sizeof
    check(deque(), basesize + blocksize)
  File "C:\Python39\lib\test\support\__init__.py", line 1483, in check_sizeof
    import _testinternalcapi
ModuleNotFoundError: No module named '_testinternalcapi'

----------------------------------------------------------------------

Ran 79 tests in 0.696s

FAILED (errors=1, skipped=1)
test test_deque failed
test_deque failed

== Tests result: FAILURE ==

1 test failed:
    test_deque

Total duration: 906 ms
Tests result: FAILURE

C:\Python39>