assertEquals(3, admin.getRoleListOfUser("saman").length);
// negative
admin.updateUserListOfRole("role2", new String[] { "saman" }, null);
admin.updateUserListOfRole("role3", null, new String[] { "amara", "sunil" });
try {
admin.updateUserListOfRole(null, null, new String[] { "d" });
fail("Exception thrown at null Roll name failed");
}catch (Exception e) {
// exptected error in negative testing