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moto not compatible with mock 4.0.3

See original GitHub issue

Versions Using moto-1.3.16 (boto-2.49.0 boto3-1.16.20 botocore-1.19.33)

Problem Mock has released 5h ago a new version: 4.0.3 Since then our tests are failing with the exception below.

Fix Forcing the version of mock to 4.0.2 is solving our issue

Traceback (most recent call last):
  File "/usr/local/Cellar/python@3.9/3.9.0_1/Frameworks/Python.framework/Versions/3.9/lib/python3.9/runpy.py", line 197, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/usr/local/Cellar/python@3.9/3.9.0_1/Frameworks/Python.framework/Versions/3.9/lib/python3.9/runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "/usr/local/Cellar/python@3.9/3.9.0_1/Frameworks/Python.framework/Versions/3.9/lib/python3.9/unittest/__main__.py", line 18, in <module>
    main(module=None)
  File "/usr/local/Cellar/python@3.9/3.9.0_1/Frameworks/Python.framework/Versions/3.9/lib/python3.9/unittest/main.py", line 101, in __init__
    self.runTests()
  File "/usr/local/Cellar/python@3.9/3.9.0_1/Frameworks/Python.framework/Versions/3.9/lib/python3.9/unittest/main.py", line 271, in runTests
    self.result = testRunner.run(self.test)
  File "/usr/local/Cellar/python@3.9/3.9.0_1/Frameworks/Python.framework/Versions/3.9/lib/python3.9/unittest/runner.py", line 176, in run
    test(result)
  File "/usr/local/Cellar/python@3.9/3.9.0_1/Frameworks/Python.framework/Versions/3.9/lib/python3.9/unittest/suite.py", line 84, in __call__
    return self.run(*args, **kwds)
  File "/usr/local/Cellar/python@3.9/3.9.0_1/Frameworks/Python.framework/Versions/3.9/lib/python3.9/unittest/suite.py", line 122, in run
    test(result)
  File "/usr/local/Cellar/python@3.9/3.9.0_1/Frameworks/Python.framework/Versions/3.9/lib/python3.9/unittest/suite.py", line 84, in __call__
    return self.run(*args, **kwds)
  File "/usr/local/Cellar/python@3.9/3.9.0_1/Frameworks/Python.framework/Versions/3.9/lib/python3.9/unittest/suite.py", line 122, in run
    test(result)
  File "/usr/local/Cellar/python@3.9/3.9.0_1/Frameworks/Python.framework/Versions/3.9/lib/python3.9/unittest/suite.py", line 84, in __call__
    return self.run(*args, **kwds)
  File "/usr/local/Cellar/python@3.9/3.9.0_1/Frameworks/Python.framework/Versions/3.9/lib/python3.9/unittest/suite.py", line 122, in run
    test(result)
  File "/usr/local/Cellar/python@3.9/3.9.0_1/Frameworks/Python.framework/Versions/3.9/lib/python3.9/unittest/case.py", line 653, in __call__
    return self.run(*args, **kwds)
  File "../.venv/lib/python3.9/site-packages/moto/core/models.py", line 102, in wrapper
    self.stop()
  File "../.venv/lib/python3.9/site-packages/moto/core/models.py", line 86, in stop
    self.default_session_mock.stop()
  File "../.venv/lib/python3.9/site-packages/mock/mock.py", line 1563, in stop
    return self.__exit__(None, None, None)
  File "../.venv/lib/python3.9/site-packages/mock/mock.py", line 1529, in __exit__
    if self.is_local and self.temp_original is not DEFAULT: