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Automation testing for aws lambda functions in python

I have an aws lambda function that will write s3 file metadata information to dynamodb for every object created into s3 bucket, for that I have an event trigger on s3 bucket. So I am planning to automate testing with python. Can anyone help how I can automate this lambda function to test the following using the unittest package.

  • Check existence of dynamodb table
  • Check if bucket exists or not in s3 to fire event.
  • Check the number of files in the s3 bucket and the number of records in the Dynamodb table.
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This can be done using moto

and unittest

. What moto

will do is add to the stateful mock for AWS - your code can continue the call boto

as usual, but the calls will not actually be made to AWS. Instead, it moto

will create a state in memory.

For example, you could

  • Activate layout for DynamoDB
  • create DynamoDB table
  • Add items to table
  • Extract the items from the table and see that they exist.


If you are creating functionality for DynamoDB and S3, you would use methods from mock_s3

and .mock_dynamodb2

moto

I wrote a tutorial on how to do this (it uses pytest

instead unittest

, but that should be a minor difference). Check it out: joshuaballoch.github.io/testing-lambda-functions/

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