Why doesn't PHPUnit see Laravel Facades? - laravel

I have problem with PHPUnit testing and Laravel
Exception: Class 'DB' not found
My TestCase file:
namespace Tests;
use Illuminate\Foundation\Testing\TestCase as BaseTestCase;
abstract class TestCase extends BaseTestCase
{
use CreatesApplication;
}
My CreatesApplication file:
namespace Tests;
use Illuminate\Contracts\Console\Kernel;
trait CreatesApplication
{
public function createApplication()
{
$app = require __DIR__.'/../bootstrap/app.php';
$app->make(Kernel::class)->bootstrap();
return $app;
}
}
This is my Test:
namespace Tests\Unit;
use App\Services\RepetitionService;
use PHPUnit\Framework\TestCase;
class RepetitionServiceTest extends TestCase
{
public function testGetNextIteration()
{
$repetitionService = new RepetitionService;
$nextIteration = $repetitionService->getNextIteration(1);
$this->assertEquals(2, $nextIteration);
}
}
Method that is being tested:
public function getNextIteration(int $lastIteration) : int
{
// some example code (method is not real but code below copied from original method)
\DB::table('cards')->get();
Config::get('params.repeat_iterations');
config('params.repeat_iterations');
}
Commend:
php vendor/phpunit/phpunit/phpunit --configuration phpunit.xml tests/Unit
Versions:
laravel 7
PHP 7.4
PHPUnit 9


Try to use DB from this path
use Illuminate\Support\Facades\DB;

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Check https://laravel.com/docs/5.8/testing you should not use Dependency Injection on controller. Instead you should call the endpoint.
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namespace Tests\Feature;
use Tests\TestCase;
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