use client?s mimetype as fallback for uploads

www/analytics/plugins/MobileMessaging/SMSProvider/StubbedProvider.php

@@ -0,0 +1,34 @@
+<?php
+/**
+ * Piwik - Open source web analytics
+ *
+ * @link http://piwik.org
+ * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
+ *
+ */
+namespace Piwik\Plugins\MobileMessaging\SMSProvider;
+
+use Piwik\Plugins\MobileMessaging\SMSProvider;
+
+/**
+ * Used for testing
+ *
+ */
+class StubbedProvider extends SMSProvider
+{
+
+    public function verifyCredential($apiKey)
+    {
+        return true;
+    }
+
+    public function sendSMS($apiKey, $smsText, $phoneNumber, $from)
+    {
+        // nothing to do
+    }
+
+    public function getCreditLeft($apiKey)
+    {
+        return 1;
+    }
+}