Add testing for mail features

Signed-off-by: Fred Boniface <fred@fjla.uk>

src/services/mail.services.js

@@ -0,0 +1,7 @@
+const log = require('../utils/log.utils')
+const mail = require('some-mail-module')
+
+async function sendTest() {
+    // Send test mail message
+    return;
+}