http://four.laravel.com/docs/testing Says \"After installing a new Laravel application, simply run phpunit on the command line to run your tests.\"
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If you are a window user and you are having this issue, do this:
You need to tell Window where to find PHPUnit command, you can first of all verify that this file exists in your Laravel project under /vendor/bin

Finally you need to append the full path to /vendor/bin in your window PATH variable,
To do this: 1. Right-click on 'Computer' then click properties

Advanced system settings
Advanced click Environmental Variables
PATH then set PATH variable by appendingthe full path to your laravel-project/vendor/bin; Notice the ; at the end.
NB: Other variables might already exists in the PATH, so ensure you don't overwrite them by appending your own at the very end
Ok on all the dialog boxes 