Added common mock functions and fixed tests

tests/common_mocks.h

@@ -0,0 +1,10 @@
+#ifndef COMMON_MOCKS_H
+#define COMMON_MOCKS_H
+
+#include "xmpp/xmpp.h"
+
+void mock_connection_status(jabber_conn_status_t status);
+void mock_connection_account_name(char *name);
+void expect_room_list_request(char *conf_server);
+
+#endif