PHPUnit test a static function located in a trait

In a piece of legacy code I was tasked to test a static function in a trait like that:

namespace App\Model\SomeLogic;

trait WhyDecidedToUseTrait
{
   public static function aMethodThatDoesSomeFancyStuff()
   {
     //Method Logic
   }
}

And from this piece of documentation using the getMockForTrait method. But in my case making a dummy object in order to test a static function where object instants are useless to begin with has no value.

Also testing the method in objects that use this trait seems pretty much time consuming, also tdoing a larger scale refactoring is time consuming as well.

So how I can test the trait in order to gradually refactor any class that uses it?