Testable JavaScript

Chapter 6. Integration, Performance, and Load Testing

In addition to unit testing, it is also important for you to conduct integration, performance, and load testing on your applications. Writing integration tests that run either against “real” browsers or headlessly in an automated build environment is surprisingly simple. As is true of most things, once the boilerplate code and configuration are in place, it’s easy to add tests. For the tests we conduct in this chapter, we will generate a standard waterfall graph of web application load times. Generating and integrating a waterfall graph is also surprisingly simple!

The Importance of Integration

All test types rely on your entire application being up and running. Whether in a testing environment or in production, all the pieces of the application must fit together. Testable JavaScript mandates small pieces of code with minimal dependencies; the piper gets paid when all those pieces are combined. An event-based architecture is an example of lots of loosely coupled pieces that must work in concert when combined. Therefore, it is imperative that automation is present to deploy and bring up the system. Once the system is up, testing can proceed.

Integration Testing

Conducting an integration test on a web application requires running your application in a browser and ensuring that its functionality works as expected. Testing pieces in isolation through unit testing is a nice start, but you must follow this up with integration testing. ...