@Override
    public List<String> findUserLikeUsername(String username) {
        String sql = "SELECT username FROM users WHERE username LIKE ?";
        List<String> users = this.jt.queryForList(sql, new String[] {String.format("%%%s%%", username)}, String.class);
        return users;
    }
@Test
    void testFindUserLikeUsername() {
        List<String> username = externalUserPersistService.findUserLikeUsername("username");
        
        assertEquals(0, username.size());
    }