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Using Mock Service Worker to Improve Jest Unit Tests
Mock Service Worker (MSW) improves unit tests of components that make API calls by defining mocks at the network level instead of mocking our own custom code. Better still, we get that benefit while also making our test code smaller, easier to read and easier to reuse.
Test-Driven Development Guided Lab: Refactoring Existing Code
Legacy code, code that is not under active development or has been passed on to a new engineering team, carries a stigma of being difficult to change and/or maintain. It is often treated as a black box that cannot be altered due to fear of repercussions. This fear does not have to exist, and legacy code can be adopted and improved through refactoring practices. This lab will walk you through the process of adding "characterization tests" to the code that has been provided, and then guide you through several refactoring cycles to make the code easier to understand and maintain. Through this, you will learn and practice effective refactoring techniques.
Test-Driven Development Lab: Build a To-Do API
Putting test-driven development into practice is the best way to learn to apply TDD effectively. This lab allows you to explore TDD by implementing a "To Do" Application Programmer Interface (API) using JavaScript. This application uses a database to persist data, which means that you will need to follow best-practices to test interfaces to third-party systems effectively. During this lab, you will work to implement both the tests that drive the intended behavior of the application and the code that satisfies those tests. This lab is implemented using JavaScript (ES6). Some experience with JavaScript will be helpful to complete the lab, but there are code samples provided in the documentation that can help you if you are unsure.
What Is CORS (Cross-Origin Resource Sharing)?
Why do I get a CORS error on my website? What does it mean when a client needs us to implement CORS?
Test-Driven Development Guided Lab: Mocking External Dependencies
This lab will guide you through the process of test-driven development (TDD) for code with external dependencies. The lab covers mocking dependencies both by hand and using a mocking framework. The code for this lab will be written using JavaScript (ES6).
Using Jest to Run Integration Tests
Jest is a popular unit test framework that can easily be extended to include integration tests. We'll discuss writing an integration framework in a Node environment backed by a MySQL database.
Turning a Website Into a Progressive Web App
In this lab you turn a website into a Progressive Web Application, this way it can run on a edge device without an Internet connection.