Adapt tests to run on laravel 6

config/laravel_api.php

@@ -15,7 +15,7 @@
 
         'policy' => app_path('Policies/'),
 
-        'auth_test' => base_path('tests/Authentication/'),
+        'auth_test' => base_path('tests/Feature/Authentication/'),
 
         'templates' => 'vendor/swisnl/json-api-server/resources/templates/',
 

sample/Tests/SampleAuthenticationTest.php

@@ -4,17 +4,17 @@
 
 use App\Sample;
 use App\SamplePermissions;
-use Illuminate\Foundation\Testing\DatabaseTransactions;
+use Illuminate\Foundation\Testing\RefreshDatabase;
 use Tests\TestCase;
 
 class SampleAuthenticationTest extends TestCase
 {
-    use DatabaseTransactions;
+    use RefreshDatabase;
 
     protected $user;
     protected $baseUrl;
 
-    public function setUp()
+    public function setUp(): void
     {
         parent::setUp();
         $this->user = factory(User::class)->create();