Laravel Unit Tests not working

I am trying to make tests, but they aren't working at all :(

Steps I followed:

1. php artisan make:test ExampleTest
2. php artisan config:clear
3. php artisan test

Example test was created successfully:

namespace Tests\Feature;

use Illuminate\Foundation\Testing\RefreshDatabase;
use Illuminate\Foundation\Testing\WithFaker;
use Tests\TestCase;


class ExampleTest extends TestCase
{
    /**
     * A basic feature test example.
     *
     * @return void
     */
    public function test_example()
    {
        $response = $this->get('/');

        $response->assertStatus(200);
    }
}

Running the test doesn't result in a proper result

# php artisan test
Warning: TTY mode is not supported on Windows platform.

   FAIL  Tests\Feature\ExampleTest
  ⨯ example

  ---

  • Tests\Feature\ExampleTest > example
   Error

  Call to a member function getStatusCode() on bool

  at C:\wamp64\www\jvz-api\tests\Feature\ExampleTest.php:20
     16▕     public function test_example()
     17▕     {
     18▕         $response = $this->get('/');
     19▕
  ➜  20▕         $response->assertStatus(200);
     21▕     }
     22▕ }
     23▕

  1   C:\wamp64\www\jvz-api\vendor\phpunit\phpunit\phpunit:92
      PHPUnit\TextUI\Command::main()


  Tests:  1 failed
  Time:   0.28s

I have read a lot of tutorials and it should work out of the box but I can't figure out why it is not working. I am trying to connect an API server.