Removing a config entry for a test

@yoeriboven it seems like there is no built-in way to do this, but you can easily extend Illuminate\Config\Repository class and add unset method which modifies protected $items property where all config values are stored:

use Illuminate\Config\Repository;
use Illuminate\Support\Arr;
use Illuminate\Support\Facades\Config;
use Tests\TestCase;

class ConfigTest extends TestCase
{
    /** @test */
    public function unset_key()
    {
        app()->instance('config', new class extends Repository {
            public function unset($key)
            {
                Arr::forget($this->items, $key);
            }
        });

        $this->assertFalse(Config::has('test'));

        Config::set('test', 'test');

        $this->assertTrue(Config::has('test'));
        
        Config::set('test', null);
        
        $this->assertTrue(Config::has('test'));
        
        Config::unset('test');

        $this->assertFalse(Config::has('test'));
    }
}

PHPUnit 8.5.2 by Sebastian Bergmann and contributors.

.                                                                   1 / 1 (100%)

Time: 181 ms, Memory: 16.00 MB

OK (1 test, 4 assertions)

This is great. Thanks!