GCC warns if a format string is statically known to be empty. Since we mark up printf-style QTest::addRow() using the resp. attribute, GCC warns here, too: tst_q23_expected.cpp:23:19: warning: zero-length gnu_printf format string [-Wformat-zero-length] 23 | QTest::addRow("") << false; | ^~ Instead of using the old newRow(), add some content to the data tag instead. It cannot be left unmentioned that this test doesn't test ... very much. I hope we don't use this component in production code, yet... Amends 4e9f4d5d02e29b4522540b8f9b9b01b7e57a6b54. Pick-to: 6.10 Change-Id: I50ebb074997e034506c6602ff7602ad392b745be Reviewed-by: Thiago Macieira <thiago.macieira@intel.com> Reviewed-by: Tim Blechmann <tim.blechmann@qt.io>