Sure. Lambda isn't great. There are trade offs. I'm not gonna try and say that it should replace containerized applications (I would choose those 9 times out o

Sure. Lambda isn't great. There are trade offs. I'm not gonna try and say that it should replace containerized applications (I would choose those 9 times out of 10 given the choice). Unfortunately, there are cases where there isn't a choice or Lambda is still a good choice (like maybe the grandparent's image resize thing, probably depends on a lot of things). I tend to think of a Lambda as a custom piece of cloud infrastructure. So, in addition to unit tests, I just test them like I would any other Terraform module. I use Terratest to deploy a stack containing the resource under test and a surrounding harness. In this case, maybe the Lambda, a source bucket, a destination bucket, a DLQ, logs, etc. Then execute my test cases, poll for results, do assertions, etc. When it's done, Terratest destroys the stack.