@Override
    public User findUserByUsername(String username) {
        String sql = "SELECT username,password FROM users WHERE username=? ";
        return databaseOperate.queryOne(sql, new Object[] {username}, USER_ROW_MAPPER);
    }
@Test
    void testFindUserByUsername() {
        User user = embeddedUserPersistService.findUserByUsername("username");
        
        assertNull(user);
    }