@Test
public void testLogWithoutLocationWithBadFormat() {

  final Logger log = mock(Logger.class);
  final Slf4jLogTarget target = new Slf4jLogTarget(log);
  target.log(LogLevel.TRACE, null, "format %d", 1, new Object[] {3.14}, null, Zlg.entrypoint);
  
  verify(log).trace(contains("WARNING -"));
}