Mocking boto exception

October 3, 2015 | minutes read

I was getting so frustrated.

I knew how to raise the exception with side_effect=. But, how do you mock the exception?

    connection = connect_to_sqs
except BotoServerError as m:
    if m.error_code == "AlreadyExistsException"

To get it to work, I inherited the exception class – BotoServerError

from boto.exceptions import BotoServerError

class MockBotoServerError(BotoServerError):
    def __init__(self, error_code)
        self.error_code = error_code

@mock.patch('', side_effect=MockBotoServerError())

Order of decorator

Also, pay attention to the order of parameters. My assertions were failing left and right.

I’m Matt Chung. I’m a software engineer, seasoned technology leader, and father currently based in Seattle and London. I love to share what I know. I write about topic developing scalable & fail-safe software running in the AWS cloud, digital organization as a mechanism for unlocking your creativity, and maximizing our full potentials with personal development habits.

View all articles