Cannot find PHPUnit in include path phpstorm

Question

Cannot find PHPUnit in include path is the error message I get when I try to run my code in phpstorm.

In the PHP Settings, my PHP level language is 5

Answer 1

I had this same problem for PHPStorm 2017 using Vagrant. First go to Settings -> Languages and Frameworks -> PHP and Add a remote interpreter, then go to Settings -> Languages and Frameworks -> PHP -> PHPUnit click the + on top and click by Remote Interpreter. If you're using Composer autoloader, then enter your full Vagrant path to your autoloader file.