How to mock specific boto3 exceptions?












0















I want to test my code behavior when the cloudformation client raises an AlreadyExistsException. But I can't figure out how to raise it with python mock.



class StackHelper:



    def __init__(self, stack_name: str, cfn_client, capabilities: List[str]):

        self.stack_name = stack_name

        self.cfn_client = cfn_client

        self.capabilities = capabilities



    def deploy(self, template_url: str, params: object = object()):

        try:

            self.create_stack(template_url, params)

        except self.cfn_client.exceptions.AlreadyExistsException as e:

            try:

                print('Stack already exists => update_stack')

                self.update_stack(template_url, params)

            except ClientError as e:

                if e.response['Error']['Message'] == 'No updates are to be performed.':

                    print('Nothing to update.')

                else:

                    raise


Test is something like:



    mock_cfn_client = Mock()

    mock_cfn_client.return_value.create_stack.side_effect = Mock(side_effect=???)


For this I already mocked cfn_client, but now struggle on how to raise the boto3 exception I expect in the code for except self.cfn_client.exceptions.AlreadyExistsException.






python python-3.x mocking amazon-cloudformation boto3







share|improve this question

























  • Mock(side_effect=AlreadyExistsException)? If the side effect is an exception class or instance, an error gets thrown.

    – jonrsharpe
    Jan 20 at 15:20


















0















I want to test my code behavior when the cloudformation client raises an AlreadyExistsException. But I can't figure out how to raise it with python mock.



class StackHelper:



    def __init__(self, stack_name: str, cfn_client, capabilities: List[str]):

        self.stack_name = stack_name

        self.cfn_client = cfn_client

        self.capabilities = capabilities



    def deploy(self, template_url: str, params: object = object()):

        try:

            self.create_stack(template_url, params)

        except self.cfn_client.exceptions.AlreadyExistsException as e:

            try:

                print('Stack already exists => update_stack')

                self.update_stack(template_url, params)

            except ClientError as e:

                if e.response['Error']['Message'] == 'No updates are to be performed.':

                    print('Nothing to update.')

                else:

                    raise


Test is something like:



    mock_cfn_client = Mock()

    mock_cfn_client.return_value.create_stack.side_effect = Mock(side_effect=???)


For this I already mocked cfn_client, but now struggle on how to raise the boto3 exception I expect in the code for except self.cfn_client.exceptions.AlreadyExistsException.






python python-3.x mocking amazon-cloudformation boto3







share|improve this question

























  • Mock(side_effect=AlreadyExistsException)? If the side effect is an exception class or instance, an error gets thrown.

    – jonrsharpe
    Jan 20 at 15:20
















0












0








0








I want to test my code behavior when the cloudformation client raises an AlreadyExistsException. But I can't figure out how to raise it with python mock.



class StackHelper:



    def __init__(self, stack_name: str, cfn_client, capabilities: List[str]):

        self.stack_name = stack_name

        self.cfn_client = cfn_client

        self.capabilities = capabilities



    def deploy(self, template_url: str, params: object = object()):

        try:

            self.create_stack(template_url, params)

        except self.cfn_client.exceptions.AlreadyExistsException as e:

            try:

                print('Stack already exists => update_stack')

                self.update_stack(template_url, params)

            except ClientError as e:

                if e.response['Error']['Message'] == 'No updates are to be performed.':

                    print('Nothing to update.')

                else:

                    raise


Test is something like:



    mock_cfn_client = Mock()

    mock_cfn_client.return_value.create_stack.side_effect = Mock(side_effect=???)


For this I already mocked cfn_client, but now struggle on how to raise the boto3 exception I expect in the code for except self.cfn_client.exceptions.AlreadyExistsException.






python python-3.x mocking amazon-cloudformation boto3







share|improve this question
















I want to test my code behavior when the cloudformation client raises an AlreadyExistsException. But I can't figure out how to raise it with python mock.



class StackHelper:



    def __init__(self, stack_name: str, cfn_client, capabilities: List[str]):

        self.stack_name = stack_name

        self.cfn_client = cfn_client

        self.capabilities = capabilities



    def deploy(self, template_url: str, params: object = object()):

        try:

            self.create_stack(template_url, params)

        except self.cfn_client.exceptions.AlreadyExistsException as e:

            try:

                print('Stack already exists => update_stack')

                self.update_stack(template_url, params)

            except ClientError as e:

                if e.response['Error']['Message'] == 'No updates are to be performed.':

                    print('Nothing to update.')

                else:

                    raise


Test is something like:



    mock_cfn_client = Mock()

    mock_cfn_client.return_value.create_stack.side_effect = Mock(side_effect=???)


For this I already mocked cfn_client, but now struggle on how to raise the boto3 exception I expect in the code for except self.cfn_client.exceptions.AlreadyExistsException.






python python-3.x mocking amazon-cloudformation boto3




python python-3.x mocking amazon-cloudformation boto3






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Jan 21 at 10:22







mnwk

















asked Jan 20 at 15:16









mnwkmnwk

63




63













  • Mock(side_effect=AlreadyExistsException)? If the side effect is an exception class or instance, an error gets thrown.

    – jonrsharpe
    Jan 20 at 15:20





















  • Mock(side_effect=AlreadyExistsException)? If the side effect is an exception class or instance, an error gets thrown.

    – jonrsharpe
    Jan 20 at 15:20



















Mock(side_effect=AlreadyExistsException)? If the side effect is an exception class or instance, an error gets thrown.

– jonrsharpe
Jan 20 at 15:20







Mock(side_effect=AlreadyExistsException)? If the side effect is an exception class or instance, an error gets thrown.

– jonrsharpe
Jan 20 at 15:20














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