Move integration tests to separate directory

Again, we do all of this to prepare for creating "real" test suites for
each type of tests.

tests/integration/RetrievesAuthorizedUsers.php

@@ -0,0 +1,37 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * (c) Toby Zerner <toby.zerner@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Flarum\Tests\integration;
+
+use Flarum\User\User;
+
+trait RetrievesAuthorizedUsers
+{
+    protected $userAttributes = [
+        'username' => 'normal',
+        'password' => 'too-obscure',
+        'email' => 'normal@machine.local'
+    ];
+
+    public function getAdminUser(): User
+    {
+        return User::find(1);
+    }
+
+    public function getNormalUser(): User
+    {
+        return User::unguarded(function () {
+            return User::firstOrCreate([
+                'username' => $this->userAttributes['username']
+            ], $this->userAttributes);
+        });
+    }
+}