Rename API tests for more consistency

I could not come up with a noun for the new "UpdateTest" for users, so
this is easier in terms of consistency.

tests/integration/api/groups/CreateTest.php

@@ -0,0 +1,115 @@
+<?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\Tests\integration\api\groups;
+
+use Flarum\Group\Group;
+use Flarum\Tests\integration\RetrievesAuthorizedUsers;
+use Flarum\Tests\integration\TestCase;
+use Illuminate\Support\Arr;
+
+class CreateTest extends TestCase
+{
+    use RetrievesAuthorizedUsers;
+
+    public function setUp()
+    {
+        parent::setUp();
+
+        $this->prepareDatabase([
+            'users' => [
+                $this->adminUser(),
+                $this->normalUser(),
+            ],
+            'groups' => [
+                $this->adminGroup(),
+            ],
+            'group_user' => [
+                ['user_id' => 1, 'group_id' => 1],
+            ],
+        ]);
+    }
+
+    /**
+     * @test
+     */
+    public function admin_cannot_create_group_without_data()
+    {
+        $response = $this->send(
+            $this->request('POST', '/api/groups', [
+                'authenticatedAs' => 1,
+                'json' => [],
+            ])
+        );
+
+        $this->assertEquals(422, $response->getStatusCode());
+    }
+
+    /**
+     * @test
+     */
+    public function admin_can_create_group()
+    {
+        $response = $this->send(
+            $this->request('POST', '/api/groups', [
+                'authenticatedAs' => 1,
+                'json' => [
+                    'data' => [
+                        'attributes' => [
+                            'nameSingular' => 'flarumite',
+                            'namePlural' => 'flarumites',
+                            'icon' => 'test',
+                            'color' => null,
+                        ],
+                    ],
+                ],
+            ])
+        );
+
+        $this->assertEquals(201, $response->getStatusCode());
+
+        // Verify API response body
+        $data = json_decode($response->getBody()->getContents(), true);
+        $this->assertEquals('flarumite', Arr::get($data, 'data.attributes.nameSingular'));
+        $this->assertEquals('flarumites', Arr::get($data, 'data.attributes.namePlural'));
+        $this->assertEquals('test', Arr::get($data, 'data.attributes.icon'));
+        $this->assertNull(Arr::get($data, 'data.attributes.color'));
+
+        // Verify database entry
+        $group = Group::where('icon', 'test')->firstOrFail();
+        $this->assertEquals('flarumite', $group->name_singular);
+        $this->assertEquals('flarumites', $group->name_plural);
+        $this->assertEquals('test', $group->icon);
+        $this->assertNull($group->color);
+    }
+
+    /**
+     * @test
+     */
+    public function normal_user_cannot_create_group()
+    {
+        $response = $this->send(
+            $this->request('POST', '/api/groups', [
+                'authenticatedAs' => 2,
+                'json' => [
+                    'data' => [
+                        'attributes' => [
+                            'nameSingular' => 'flarumite',
+                            'namePlural' => 'flarumites',
+                            'icon' => 'test',
+                            'color' => null,
+                        ],
+                    ],
+                ],
+            ])
+        );
+
+        $this->assertEquals(403, $response->getStatusCode());
+    }
+}