@Test
void testUsername() {

	assertFalse(username(null));
	assertFalse(username("test user"));
	assertFalse(username("_test*"));
	assertFalse(username(""));
	assertFalse(username(RandUtil.nextAlphabetic(USER_MAX + 1)));
	assertFalse(username(RandUtil.nextAlphabetic(USER_MIN - 1)));
	assertTrue(username("cilki"));
}