Update stub for unit tests

[Ryan-at-RoofMaxx]

PROBLEM
As a newbie to testing, when I run php artisan make:test SomeTest --unit
Then I write a test, and then when I run it, I get this error:

Illuminate\Contracts\Container\BindingResolutionException: Target class [config] does not exist.

The problem is that all out-of-the-box generated --unit tests contain this on line 5:

use PHPUnit\Framework\TestCase;

So one of the first things I do when I create a new test is change this line to:

use Tests\TestCase;

SOLUTION:
I can run php artisan stub:publish
And update my own copy of stubs/test.unit.stub.php

But it would be nice if this worked as expected out of the box.
I plan on submitting a pull request for this momentarily...

[crynobone]

This is the expected behaviour for --unit.