Can anyone explain how should I go about writing unit tests for JavaScript? The code mostly creates the ui (i.e. create button and input controls dynamically) a

Can anyone explain how should I go about writing unit tests for JavaScript? The code mostly creates the ui (i.e. create button and input controls dynamically) and then displays and updates data. We thought about using intern but I don't really know what should the tests be about. The backend is already test driven so I don't have to test that the data is actually saved.