Add accessory checkin test

tests/Feature/Checkins/Api/AccessoryCheckinTest.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace Tests\Feature\Checkins\Api;
+
+use App\Models\Accessory;
+use App\Models\User;
+use Tests\Concerns\TestsPermissionsRequirement;
+use Tests\TestCase;
+
+class AccessoryCheckinTest extends TestCase implements TestsPermissionsRequirement
+{
+    public function testRequiresPermission()
+    {
+        $accessory = Accessory::factory()->checkedOutToUser()->create();
+
+        $this->actingAsForApi(User::factory()->create())
+            ->postJson(route('api.accessories.checkin', $accessory))
+            ->assertForbidden();
+    }
+}