Added API /ping endpoint. Closes #687

tests/Api/GeneralTest.php

@@ -0,0 +1,24 @@
+<?php
+
+/*
+ * This file is part of Cachet.
+ *
+ * (c) Cachet HQ <support@cachethq.io>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace CachetHQ\Tests\Cachet\Api;
+
+use CachetHQ\Tests\Cachet\AbstractTestCase;
+
+class GeneralTest extends AbstractTestCase
+{
+    public function testGetPing()
+    {
+        $this->get('/api/v1/ping');
+        $this->seeJson(['data' => 'Pong!']);
+        $this->assertResponseOk();
+    }
+}