php artisan make test
Use this command
php artisan make:test BasicTest --unit
Also you can use
php artisan make:test --help
to see available options
You must be create your custom artiasn command
<?php
namespace App\Console;
class TestMakeCommand extends \Illuminate\Foundation\Console\TestMakeCommand
{
    /**
     * The console command name.
     *
     * @var string
     */
    protected $signature = 'make:test-custom {name : The name of the class} {--unit : Create a unit test} {--path= : Create a test in path}';
    /**
     * Get the default namespace for the class.
     *
     * @param  string  $rootNamespace
     * @return string
     */
    protected function getDefaultNamespace($rootNamespace)
    {
        $path = $this->option('path');
        if (!is_null($path)) {
            if ($path) {
                return $rootNamespace. '\\' . $path;
            }         
            return $rootNamespace;
        }
        if ($this->option('unit')) {
            return $rootNamespace.'\Unit';
        }
        return $rootNamespace.'\Feature';
    }
}
Register it in kernel
<?php
namespace App\Console;
use Illuminate\Console\Scheduling\Schedule;
use Illuminate\Foundation\Console\Kernel as ConsoleKernel;
class Kernel extends ConsoleKernel
{
    /**
     * The Artisan commands provided by your application.
     *
     * @var array
     */
    protected $commands = [
        TestMakeCommand::class
    ];
    ......  
}
Then you can use
php artisan make:test-custom BasicTest --path=
or
php artisan make:test-custom BasicTest --path=Example
