Book Image

AWS CDK in Practice

By : Mark Avdi, Leo Lam
Book Image

AWS CDK in Practice

By: Mark Avdi, Leo Lam

Overview of this book

As cloud applications are becoming more complex, multiple tools and services have emerged to cater to the challenges of running reliable solutions. Although infrastructure as code, containers, and orchestration tools, such as Kubernetes, have proved to be efficient in solving these challenges, AWS CDK represents a paradigm shift in building easily developed, extended, and maintained applications. With AWS CDK in Practice, you’ll start by setting up basic day-to-day infrastructure while understanding the new prospects that CDK offers. You’ll learn how to set up pipelines for building CDK applications on the cloud that are long-lasting, agile, and maintainable. You’ll also gain practical knowledge of container-based and serverless application development. Furthermore, you’ll discover how to leverage AWS CDK to build cloud solutions using code instead of configuration files. Finally, you’ll explore current community best practices for solving production issues when dealing with CDK applications. By the end of this book, you’ll have practical knowledge of CDK, and you’ll be able to leverage the power of AWS with code that is simple to write and maintain using AWS CDK.
Table of Contents (17 chapters)
Part 1: An Introduction to AWS CDK
Part 2: Practical Cloud Development with AWS CDK
Part 3: Serverless Development with AWS CDK
Part 4: Advanced Architectural Concepts

Various ways of testing CDK apps

CDK testing is generally performed in one of two ways:

  • Fine-grained assertions: These types of tests are similar to unit testing and are performed to detect regressions. They are conducted with the AWS CDK assertions module (found at, which integrates with common testing frameworks such as Jest ( and essentially tests that certain modules in our CDK app have certain properties – for example, a certain EC2 instance will have a specific AMI.
  • Snapshot tests: Closer to integration testing, snapshot tests don’t care how you wire up your CDK application. They compare the output of a synthesized CDK stack to a previous state after changes have been applied. Snapshot tests are a great way to refactor your CDK application while making sure the outputs are the same (another way to deal with regression issues).

AWS recommends using...