Lightning Aura Components Developer Guide
jNote: This release is in preview. Features described here don’t become generally available until the latest general availability date that Salesforce announces for this release. Before then, and where features are noted as beta, pilot, or developer preview, we can’t guarantee general availability within any particular time frame or at all. Make your purchase decisions only on the basis of generally available products and features.
Testing Components
Automated tests are the best way to achieve predictable, repeatable assessments
of the quality of your custom code. Writing automated tests for your custom
components gives you confidence that they work as designed, and allows you to
evaluate the impact of changes, such as refactoring, or of new versions of
Salesforce or third-party JavaScript libraries.
Use your testing framework of choice. Here are some popular testing tools.