Learning D3.js 5 Mapping - Second Edition

Unit testing

Now that we have a code base written in a testable way, let's automate those tests so that we do not have to perform them manually and can continue to code and refactor with ease.

If you look at the spec/viz_spec.js file, you will note some common patterns when unit testing. The following code is written with a JavaScript unit-testing framework called Jasmine and leverages Karma to execute the tests. You can learn more about the Jasmine syntax, assertions, and other features at http://jasmine.github.io/1.3/introduction.html.

The Bootstrap project has everything you need to start testing quickly.

The first step is to start our Karma test runner with this line of code:

node_modules/karma/bin/karma start 

This runner will watch ...