Remove createApplication method

tests/CreatesApplication.php

@@ -1,30 +0,0 @@
-<?php
-
-/*
- * This file is part of Cachet.
- *
- * (c) Alt Three Services Limited
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Tests;
-
-use Illuminate\Contracts\Console\Kernel;
-use Illuminate\Foundation\Application;
-
-trait CreatesApplication
-{
-    /**
-     * Creates the application.
-     */
-    public function createApplication(): Application
-    {
-        $app = require __DIR__.'/../bootstrap/app.php';
-
-        $app->make(Kernel::class)->bootstrap();
-
-        return $app;
-    }
-}

tests/TestCase.php

@@ -15,5 +15,4 @@ use Illuminate\Foundation\Testing\TestCase as BaseTestCase;
 
 abstract class TestCase extends BaseTestCase
 {
-    use CreatesApplication;
 }