Make sure to enter chatroom in test

spec/chatroom.js

@@ -1440,11 +1440,19 @@
                     null, ['rosterGroupsFetched'], {},
                     function (done, _converse) {
 
-                test_utils.openChatRoom(_converse, 'lounge', 'localhost', 'dummy');
+                test_utils.openAndEnterChatRoom(_converse, 'lounge', 'localhost', 'dummy').then(function () {
                     spyOn(_converse, 'emit');
                     var view = _converse.chatboxviews.get('lounge@localhost');
+
+
                     if (!$(view.el).find('.chat-area').length) { view.renderChatArea(); }
                     var nick = mock.chatroom_names[0];
+
+                    view.model.occupants.create({
+                        'nick': nick,
+                        'muc_jid': `${view.model.get('jid')}/${nick}`
+                    });
+
                     var text = 'This is a received message';
                     var message = $msg({
                         from: 'lounge@localhost/'+nick,
@@ -1458,6 +1466,7 @@
                     expect($chat_content.find('.chat-msg-text').text()).toBe(text);
                     expect(_converse.emit).toHaveBeenCalledWith('message', jasmine.any(Object));
                     done();
+                });
             }));
 
             it("shows sent groupchat messages",