diff --git a/addons/mail/static/tests/helpers/mock_server.js b/addons/mail/static/tests/helpers/mock_server.js
index f0c09386a5a..a2aef300736 100644
--- a/addons/mail/static/tests/helpers/mock_server.js
+++ b/addons/mail/static/tests/helpers/mock_server.js
@@ -4,6 +4,24 @@ odoo.define('mail.MockServer', function (require) {
 var MockServer = require('web.MockServer');
 
 MockServer.include({
+    /**
+     * Param 'data' may have a key 'initMessaging' which contains
+     * a partial overwrite of the result from mockInitMessaging.
+     *
+     * Note: we must delete this key, so that this is not
+     * handled as a model definition.
+     *
+     * @override
+     * @param {Object} [data.initMessaging] 
+     */
+    init: function (data, options) {
+        if (data && data.initMessaging) {
+            this.initMessagingData = data.initMessaging;
+            delete data.initMessaging;
+        }
+        this._super.apply(this, arguments);
+    },
+
     /**
      * Simulate the '/mail/init_messaging' route
      *
@@ -11,7 +29,7 @@ MockServer.include({
      * @return {Object}
      */
     _mockInitMessaging: function () {
-        return {
+        return _.defaults(this.initMessagingData || {}, {
             'needaction_inbox_counter': 0,
             'starred_counter': 0,
             'channel_slots': [],
@@ -19,7 +37,7 @@ MockServer.include({
             'mention_partner_suggestions': [],
             'shortcodes': [],
             'menu_id': false,
-        };
+        });
     },
     /**
      * @override
diff --git a/addons/mail/views/mail_templates.xml b/addons/mail/views/mail_templates.xml
index 28d92c9e157..6769462d404 100644
--- a/addons/mail/views/mail_templates.xml
+++ b/addons/mail/views/mail_templates.xml
@@ -54,6 +54,8 @@
         <template id="qunit_mobile_suite" name="mail_mobile_tests" inherit_id="web.qunit_mobile_suite">
             <xpath expr="//t[@t-set='head']" position="inside">
                 <script type="text/javascript" src="/mail/static/tests/discuss_mobile_tests.js"></script>
+                <script type="text/javascript" src="/mail/static/tests/helpers/mock_server.js"></script>
+                <script type="text/javascript" src="/mail/static/tests/helpers/test_utils.js"></script>
             </xpath>
         </template>