I have two Laravel 5.2 applications (lets call them A and B) on my local machine, both configured on two different virtualhosts on my local Apache 2.4 development server.
I'm facing the same exact issue with (XAMPP) Apache vHosts on Windows.
Dirty hack; caching your configurations...
php artisan config:cache
Source: #219
Note: You will need to clear the configuration cache before running phpunit tests.
php artisan config:clear
./vendor/bin/phpunit
php artisan config:cache