Prompt for nickname on registration (#4)

Allow users to set a nickname while registering, controlled by settings. Also, add a setting to hide the username input entirely and randomly generate the username.

Co-authored-by: Sami Mazouz <sychocouldy@gmail.com>

extensions/nicknames/tests/integration/api/EditUserTest.php

@@ -0,0 +1,87 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * For detailed copyright and license information, please view the
+ * LICENSE file that was distributed with this source code.
+ */
+
+namespace Flarum\Nicknames\Tests\integration;
+
+use Flarum\Group\Group;
+use Flarum\Testing\integration\RetrievesAuthorizedUsers;
+use Flarum\Testing\integration\TestCase;
+use Flarum\User\User;
+
+class UpdateTest extends TestCase
+{
+    use RetrievesAuthorizedUsers;
+
+    /**
+     * @inheritDoc
+     */
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->extension('flarum-nicknames');
+        $this->prepareDatabase([
+            'users' => [
+                $this->normalUser(),
+            ],
+        ]);
+    }
+
+    /**
+     * @test
+     */
+    public function user_cant_edit_own_nickname_if_not_allowed()
+    {
+        $this->database()->table('group_permission')->where('permission', 'user.editOwnNickname')->where('group_id', Group::MEMBER_ID)->delete();
+
+        $response = $this->send(
+            $this->request('PATCH', '/api/users/2', [
+                'authenticatedAs' => 2,
+                'json' => [
+                    'data' => [
+                        'attributes' => [
+                            'nickname' => 'new nickname',
+                        ],
+                    ],
+                ],
+            ])
+        );
+
+        $this->assertEquals(403, $response->getStatusCode());
+    }
+
+    /**
+     * @test
+     */
+    public function user_can_edit_own_nickname_if_allowed()
+    {
+        $this->prepareDatabase([
+            'group_permission' => [
+                ['permission' => 'user.editOwnNickname', 'group_id' => 2],
+            ]
+        ]);
+
+        $response = $this->send(
+            $this->request('PATCH', '/api/users/2', [
+                'authenticatedAs' => 2,
+                'json' => [
+                    'data' => [
+                        'attributes' => [
+                            'nickname' => 'new nickname',
+                        ],
+                    ],
+                ],
+            ])
+        );
+
+        $this->assertEquals(200, $response->getStatusCode());
+
+        $this->assertEquals('new nickname', User::find(2)->nickname);
+    }
+}