Let's create a test for the YoutubeSearchApp using the SFDX command line, as shown in the following code:

sfdx force:Lightning:test:create -n YoutubeSearchAppTest -d./force-app/main/default/staticresources

Upon running this command, you will notice that a JavaScript file with a describe function template is added in the staticresources folder.

We will write the test suite here and then reference them back in the jasmineTests.app test application.