Added some very basic model tests

tests/Models/ModelExistenceTest.php

@@ -0,0 +1,30 @@
+<?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\Models;
+
+use AltThree\TestBench\ExistenceTrait;
+use PHPUnit_Framework_TestCase as TestCase;
+
+/**
+ * This is the model existence test class.
+ *
+ * @author Graham Campbell <graham@alt-three.com>
+ */
+class ModelExistenceTest extends TestCase
+{
+    use ExistenceTrait;
+
+    protected function getSourcePath()
+    {
+        return realpath(__DIR__.'/../../app/Models');
+    }
+}