Fonteva has created its own Unit Testing Framework for Lightning Components. This framework requires several third-party libraries that allow you to run all of your tests offline. Fonteva’s testing framework is essentially the same as SalesForce’s framework, but while Salesforce's framework runs inside of Salesforce, Fonteva's testing framework runs outside of Salesforce. This allows you to test individual methods instead of being forced to test entire transactions.
These pages are designed to provide a walkthrough for installing the testing framework and running a test.