Install Laravel.

tests/CreatesApplication.php

@@ -0,0 +1,21 @@
+<?php
+
+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;
+    }
+}