Laravel Testing/phpunit, Too few arguments passed when using dependency injection

I'm trying to create a simple test with Laravel. My test code is as below;

<?php

namespace Tests\Feature;

use Tests\TestCase;
use Illuminate\Foundation\Testing\WithFaker;
use Illuminate\Foundation\Testing\RefreshDatabase;
use App\Http\Controllers\Abc\AbcController;

class AbcTest extends TestCase
{

 /**
 * A basic test example.
 *
 * @return void
 */

private $abcController;

public function __construct (AbcController $abcController) {
    $this->abcController = $abcController;
}

public function testExample()
{
    $this->assertTrue(true);
}

However, when i run the test, i'm hitting this error,

PHP Fatal error: Uncaught ArgumentCountError: Too few arguments to function Tests\Feature\abc::__construct(), 0 passed in /var/www/nex/backend/vendor/phpunit/phpunit/src/Framework/TestSuite.php on line 151 and exactly 1 expected in /var/www/nex/backend/tests/Feature/abc.php:28

I've been using this method of performing dependency injections for the rest of my project. I'm not sure why its not working on this particular code.

All help is appreciated.

Thanks!