LTS

LTS provides a wrapper for Jasmine and Mocha. The code for LTS is open source, so it can be easily tailored to work with other frameworks as well.

The testing service comprises a global $T object that contains methods to create components, runcallbacks, fire application events, and destroy components. The code for the$TAPI can be found at https://github.com/forcedotcom/LightningTestingService/blob/master/Lightning-component-tests/test/default/staticresources/lts_testutil.resource.

Salesforce recommends that you write and test for the following behaviors in Lightning Components:

Test use case	Description
DOM rendering	Validates that components are added where and when they should be.
Component state	Ensures that components respond as expected.
Server-side callback response	Gets the right response from a call to another service or resource.
Validation of variables	Validates whether variables that are loaded from external sources are valid.
Conditional UI rendering	Verifies what users can see.
Event handling...