test.html

<link rel="import" href="../Polymer/polymer.html">
<link rel="import" href="contact.html">

<polymer-element name="ff-userlist" attributes="online contactsonline">
    <template>
        <template repeat="{{ contact in contactsonline }}">
            <ff-contact servicenick="{{ contact.serviceNick }}"></ff-contact>
            <br/>
        </template>
    </template>
    <script>
        Polymer('ff-userlist', {
            ready: function () {
            }
        });
    </script>
</polymer-element>