def METHOD_NAME(monkeypatch):
    get_aws_region = MagicMock(name="get_aws_region")
    get_aws_region.return_value = sentinel.RETURNED_REGION
    monkeypatch.setattr(utils_base, "get_aws_region", get_aws_region)
    base_plugin = utils_base.AWSPluginBase()
    assert base_plugin.region is sentinel.RETURNED_REGION
    assert get_aws_region.call_args == call(base_plugin)