Universal Containers has started building a customer Lightning community that contains a few dozen Aura...

The correct selection is C, D. Aura components are tested with Lightning Testing Service infrastructure and browser-accessible Jasmine or Mocha test runners. The LTS package provides the framework for Aura JavaScript testing, and test results can be executed and viewed through the dedicated Jasmine test application URL. From a testing perspective, the goal is deterministic evidence that the solution behaves correctly under the conditions that matter. Tests should isolate external dependencies, use controlled data, exercise positive and negative paths, and reproduce realistic volume or user behavior where required without making production the first place defects are discovered. The rejected choices either test the wrong layer, introduce live-system dependencies, or detect problems too late to provide the deterministic early feedback expected from a mature test strategy. For this scenario, the decisive point is therefore the platform behavior represented by the selected options (C. Install the Lightning test service AppExchange package to enable the Aura component testing.; D. The testing can be viewed in the lightning.force.com/c/jasminetests.app URL. The page loads and runs Jasmine test and writes pass/fail information to the screen.). Applying that rule consistently keeps the implementation aligned with Salesforce-supported lifecycle practices and makes the resulting change easier to review, validate, and operate across environments.

Study Guide reference: Testing — Apex testing; test-data isolation; mocks; regression testing; performance/load testing; sandbox test strategy.