Testing

How to apply the TDD mindset to serverless

AWS, Serverless, Testing

Testing is an integral part of software development, and serverless is no different.

Test Driven Development, or TDD, is long regarded as a leading practice in software development. And yet, one of the most misunderstood parts of Test-Driven Development (TDD) is the “Driven” part of the name. It’s not just about “writing tests before you write the code”. If your tests do not inform and drive your API design, then you’re not really doing TDD.

In this post, let’s look at how we can apply the TDD mindset to serverless and use our tests to drive the design of our serverless application.

Testing Step Functions: how to skip time when testing Timeout and Wait states

AWS, Programming, Serverless, Step Functions, Testing

When I previously wrote about testing Step Functions, I gave you a general strategy that consists of: Component tests that target the Lambda functions (specifically, the custom code you wrote in those functions). End-to-end tests that execute the state machine in the cloud. Local tests using Step Functions Local where you can use mocks to …

Testing Step Functions: how to skip time when testing Timeout and Wait states Read More »

No, you don’t need to test every line of your CDK application

AWS, CDK, Programming, Serverless, Testing

Several people have asked me about unit testing CDK applications recently. The questions often go something like this: “Because it can be in Python or TS, people bring up unit testing for CDK, whereas it’s not even thought about with Serverless Framework, SAM or Terraform. What are your thoughts on this?” “I have so many …

No, you don’t need to test every line of your CDK application Read More »

How to include SNS and Kinesis in your e2e tests

API Gateway, AWS, DynamoDB, Kinesis, Lambda, Programming, Serverless, SNS, Testing

Update 17/09/2019: based on feedback, I added a few more alternatives that do not require you to deploy additional Lambda functions to the e2e-test stage. Scroll to the end to find out more. Being event-driven is a key characteristic of a serverless architecture. Often our Lambda functions would publish events to SNS topics or Kinesis …

How to include SNS and Kinesis in your e2e tests Read More »

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