test_msg
void test_msg(const char *);
test_msg(__FILE__ ":" __STR(__LINE__) " - " msg); \
test_msg("testing periodic (polling)");
test_msg("testing periodic (interrupts)");
test_msg("waiting for first update");
test_msg("waiting for second update");
test_msg("waiting for noon tick-over");
test_msg("excessive test count for memory sz");