Provide a LambdaContext object for use in testing

[alexmuller]

Is your feature request related to a problem? Please describe.

We test our Lambdas with pytest and do something like this:

event = {}
context = {}
response = handler(event, context)
assert response == 1

When integrating this project we discovered that we'd have to set up a LambdaContext object and pass that in.

Describe the solution you'd like

It would be great if this library provided a context-like object that we could use in our tests

from aws_lambda_powertools.utilities.typing.lambda_context import LambdaContext
context = LambdaContext(function_name='test', ...)

response = handler(event, context)

However the LambdaContext object (which is provided for IDE type hints) doesn't allow properties to be set.

Describe alternatives you've considered

We've used this snippet of code:

lambda_context = {
    'function_name': 'test',
    ...
}
context = namedtuple("LambdaContext", lambda_context.keys())(*lambda_context.values())

from here but it would be lovely to have this built-in to the library.

[boring-cyborg]

Thanks for opening your first issue here! We'll come back to you as soon as we can.

[heitorlessa]

hey @alexmuller - Check this out: #1169

We would love ideas on what a testing utility could look like. Lambda Context would be a quick one, but interested to hear your thoughts on how other events could look like, and what else could be helpful (and their UX more or less).

[alexmuller]

Thank you @heitorlessa, this looks great! The Lambda context would be a brilliant first step for me - but I'm also going to have a think about event handlers for SQS and SNS which would also be useful.

I'm going to close this issue as it's on the roadmap - thanks very much for your reply.