Imagine your JavaScript code is running some element or position calculations within an AngularJS directive.
When testing this JavaScript code, should CSS be included in karma.conf.js?
I've noticed that some popular projects have included CSS files.
For example, the ng-grid project includes CSS in their karma.conf.js:
'dist/release/ui-grid.css',
This question delves into the boundary between e2e tests and unit tests.
From my perspective, your question relates to the concept of unit testing in software development.
Unit tests are designed to evaluate the functionality of specific sections of source code.
There are various approaches to conducting unit tests for a function:
If a method within a directive is altering CSS properties, it should involve adding and removing CSS classes within the method itself. This implies that during assertions, the focus should be on checking for the presence of specific classes. (This has been my experience in most cases)
A CSS file is an external resource and serves as a dependency for JavaScript source files; hence, it must be treated as such.
In contrast, end-to-end testing resembles integration testing by ensuring seamless coordination among all integration components. Therefore, when examining CSS modifications, e2e testing should be utilized.
For an interesting discussion on Unit Testing, you can watch this video by Miško Hevery. While not focused on CSS specifically, it delves into Unit Testing as a whole and addresses handling dependencies at around 17:50.
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