Exception when trying to test RefreshToken

• PHP Version: 7.2
• Laravel Version: 6.0
• Laravel Passport Version: 7.2

Hi Everyone! In last days i'm been dealing with some difficults to make tests for an API that uses Laravel Passport. The trouble is when i do one of my feature tests, i have to test if i can login an user that i created before, after log this test user, i need to refresh his token, i tried to do this directly on the endpoint of my API (Using JSON tests API), but it doesn't works, when i give a "dd" on response i got "422" status code, without log, but if i try to send a request directly to OAuth route in passport (oauth/token), it returns me a exception at log, just like that:

(All the stack trace will be attached in this issue because have many lines) [2019-09-27 16:11:11] local.ERROR: Client authentication failed {"exception":"[object] (League\OAuth2\Server\Exception\OAuthServerException(code: 4): Client authentication failed at /home/vagrant/code/keeva/passport/vendor/league/oauth2-server/src/Exception/OAuthServerException.php:138) [StackTrace]

Some Class that i using

use App\Entities\User;
use App\Services\PassportClientManager;
use App\Services\PassportSessionManager;
use GuzzleHttp\Client;
use Illuminate\Foundation\Testing\WithFaker;
use Illuminate\Foundation\Testing\RefreshDatabase;
use Illuminate\Foundation\Testing\WithoutMiddleware;
use Laravel\Passport\Client as PassportClient;
use Laravel\Passport\ClientRepository as PassportClientRepository;
use Laravel\Passport\Passport;
use Tests\TestCase;
use Mockery;

This is my method:

/**
     * @test Should create user and login without errors
     *
     * @return void
    */
    public function should_login_user_and_refresh_token_without_errors()
    {
        /**
         * @internal Setuping user
         */
        Passport::actingAs($user = User::create([
            'name' => 'TestUser',
            'email' => '[email protected]',
            'password' => bcrypt('12345678')
        ]));
        $redirect = env('PASSPORT_REDIRECT_URL');
        $client = (new PassportClientRepository)->create($user->id, $user->name, $redirect, false, true);
        $credentials = json_encode(['email' => '[email protected]', 'password' => '12345678']);

        /**
         * @internal Authenticating user previously created
         */

        $responseForAuthentication = (new Client)->post(env('APP_URL').'api/auth/login', [
            'http_errors' => false,
            'headers' => [
                'Accept' => 'application/json',
                'Content-Type' => 'application/json',
            ],
            'body' => $credentials
        ]);
    
        $statusCode = $responseForAuthentication->getStatusCode();
        $this->assertTrue($statusCode === 200);

        $responseForAuthenticationAsArray = (array)json_decode($responseForAuthentication->getBody()->getContents());
        $refreshToken = $responseForAuthenticationAsArray['refresh_token'];
        
        /**
         * @internal Request body to AuthController endpoint
         */
        // $refreshRequestBody = json_encode([
        //     'refresh_token' => $refreshToken,
        //     'client_id' => $client->id
        // ]);

        /**
         * @internal Using HTTP TESTS to AuthController endpoint
         */
        // $responseFromRefreshing = $this->json('POST', 'api/auth/refresh', [
        //     "headers" => [
        //         "Secret" => $client->secret
        //     ], 
        //     "body" => $refreshRequestBody
        // ]);

        /**
         * @internal Using Guzzle to Passport Implementation (OAUTH directly)
         */
        $responseFromRefreshing = (new Client)->post(env('APP_URL').'oauth/token', [
            'form_params' => [
                'grant_type' => 'refresh_token',
                'refresh_token' => (string) $refreshToken,
                'client_id' => (int) $client['id'],
                'client_secret' => (string) $client['secret'],
                'scope' => '',
            ],
        ])->getBody()->getContents();
        
        $this->assertArrayHasKey('access_token', $responseForAuthenticationAsArray);
        dd($responseFromRefreshing);
    }

I don't know if it's something that I didn't do or forget, or if it's really a problem. I've researched a lot in the last few days but couldn't find a solution, the closest one I found similar to this was https://stackoverflow.com/questions/55867542/error-trying-to-test-laravel-passport-auth-cicle

I'm not using env.testing

This post come from a Issue that i openned on GitHub (https://github.com/laravel/passport/issues/1088 ), the same was closed, i dont know if i did correctly, then, i find to check it out here on Laracasts

However I appreciate it!

Best regards!