Add test for Sassmeister adapter

Author: mburtscher

tests/SassmeisterTest.php

@@ -0,0 +1,18 @@
+<?php
+
+class SassmeisterTest extends TestCaseBase
+{
+    public function testGist()
+    {
+        $this->assertEmbed(
+            'http://sassmeister.com/gist/1122e441f0434ec6eb2a',
+            [
+                'title' => 'SassMeister | The Sass Playground!',
+                'imageWidth' => 240,
+                'imageHeight' => 240,
+                'type' => 'rich',
+                'providerName' => 'sassmeister',
+            ]
+        );
+    }
+}