Testing laravel api with jwt - laravel

Question

I'm trying to write some test , the first test its for login route, I'm using jwt and mongodb, I set .env.testing identical to .env
DB_CONNECTION=mongodb
DB_HOST=127.0.0.1
DB_PORT=27017
DB_DATABASE=mydb
DB_USERNAME=myuser
DB_PASSWORD=mypass
this is phpunit.xml
<php>
<server name="APP_ENV" value="testing"/>
<server name="BCRYPT_ROUNDS" value="4"/>
<server name="CACHE_DRIVER" value="array"/>
<server name="DB_CONNECTION" value="sqlite"/>
<server name="DB_DATABASE" value=":memory:"/>
<server name="MAIL_DRIVER" value="array"/>
<server name="QUEUE_CONNECTION" value="sync"/>
<server name="SESSION_DRIVER" value="array"/>
</php>
I tried with <server name="DB_CONNECTION" value="mongodb/> but I get the same error
and this is the test
<?php
namespace Tests\Unit;
use Tests\TestCase;
class AuthTest extends TestCase
{
/**
* A basic unit test example.
*
* #return void
*/
public function test_if_login()
{
$response = $this->json('POST', 'http://127.0.0.1:8000/auth', [
'email' => 'usuario1',
'password' => '12345'
]);
$response
->assertStatus(200)
->assertJsonStructure([
'data'=>[
'token'
]
]);
}
}
but I get this error
There was 1 failure:
1) Tests\Unit\AuthTest::test_if_login
Expected status code 200 but received 500.
Failed asserting that false is true.
Not sure about what is the problem