The problem : create IT for a lambda Prerequisites :

• a serverless project written in Kotlin (java8 runtime for lambdas).
• aws sam cli
• docker

Scenario is pretty straightforward: we invoke our lambda handler and assert its response. In order to achieve that we would use The AWS Serverless Application Model, more specifically AWS SAM Local feature. The most important benefit which sam local provides is the possibility to run your handler locally in the environment which is extremely close to the one which AWS creates on the console. This achieved by a customized Docker image. So you need install Docker first to proceed. Luckily it’s easy task to do nowadays.

[…. main function] : sam local invoke "MyLambdaFunction" --params it is used for local testing -> why (docker image emulates…)

[…. side note] why sls local invoke didn’t work for me ref to github: https://github.com/serverless/serverless/issues/4867

[…. scenario in code pipeline]

[…. downside] output is not that handy. Workaround - use grep + jq and bash for asserts (because pipeline needs status)