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@mock_cloudformation doesn't work

See original GitHub issue

requirements.txt

moto
pyyaml
openapi-spec-validator

hello.py

from moto import mock_cloudformation

import unittest

@mock_cloudformation
class HelloTest(unittest.TestCase):

    def test_hello(self):
        self.assertEqual(2, 2)
    
if __name__=="__main__":
    unittest.main()

run

(env) me@mine % python hello.py                             
Traceback (most recent call last):
  File "hello.py", line 6, in <module>
    class HelloTest(unittest.TestCase):
  File "/Users/me/work/gists/aws/moto_cloudformation/env/lib/python3.8/site-packages/moto/__init__.py", line 8, in f
    module = importlib.import_module(module_name, "moto")
  File "/Users/me/.pyenv/versions/3.8.11/lib/python3.8/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 843, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/Users/me/work/gists/aws/moto_cloudformation/env/lib/python3.8/site-packages/moto/cloudformation/__init__.py", line 1, in <module>
    from .models import cloudformation_backends
  File "/Users/me/work/gists/aws/moto_cloudformation/env/lib/python3.8/site-packages/moto/cloudformation/models.py", line 18, in <module>
    from .parsing import ResourceMap, OutputMap
  File "/Users/me/work/gists/aws/moto_cloudformation/env/lib/python3.8/site-packages/moto/cloudformation/parsing.py", line 17, in <module>
    from moto.apigateway import models  # noqa  # pylint: disable=all
  File "/Users/me/work/gists/aws/moto_cloudformation/env/lib/python3.8/site-packages/moto/apigateway/__init__.py", line 1, in <module>
    from .models import apigateway_backends
  File "/Users/me/work/gists/aws/moto_cloudformation/env/lib/python3.8/site-packages/moto/apigateway/models.py", line 15, in <module>
    from openapi_spec_validator.exceptions import OpenAPIValidationError
ImportError: cannot import name 'OpenAPIValidationError' from 'openapi_spec_validator.exceptions' (/Users/me/work/gists/aws/moto_cloudformation/env/lib/python3.8/site-packages/openapi_spec_validator/exceptions.py)