Right way to create unit tests with PhpStorm as SDK

Hi guys.

I  am developing my first PhpStorm plugin, and I have some actions ready,  but I don't want to publish it without adding some unit tests. I was  using PhpStorm as SDK because I already have some web projects creates  which are useful for testing my plugin.

I've  followed "Live Coding an IntelliJ IDEA Plugin from Scratch" parts 1 and  2, and it was my source of learning. But I can't get the tests to work  the way they did on those videos under the PhpStorm SDK, since some  classes are not present, so I can compile them only when choosing IDEA  Ultimate as SDK.

Is there any way to do it?