Added missing event tests

tests/Bus/Events/System/AbstractSystemEventTestCase.php

@@ -0,0 +1,31 @@
+<?php
+
+/*
+ * This file is part of Cachet.
+ *
+ * (c) Alt Three Services Limited
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace CachetHQ\Tests\Cachet\Bus\Events\System;
+
+use AltThree\TestBench\EventTrait;
+use CachetHQ\Cachet\Bus\Events\System\SystemEventInterface;
+use CachetHQ\Tests\Cachet\AbstractTestCase;
+
+/**
+ * This is the abstract system event test class.
+ *
+ * @author James Brooks <james@alt-three.com>
+ */
+abstract class AbstractSystemEventTestCase extends AbstractTestCase
+{
+    use EventTrait;
+
+    protected function getEventInterfaces()
+    {
+        return [SystemEventInterface::class];
+    }
+}