ผมเขียน code ห่วย พอเขียน test ก็เจอ bug ตลอด

fn cnt_links(s: usize, e: usize, tu: &Textunit, en_sent: &RTok) -> usize {
    tu.links.iter()
        .filter(|link| link.target > s && link.target < e)
        .filter(|link| link.source >= en_sent.s && link.source < en_sent.e)
        .count()
}

#[test]                                                                                                                                                
    fn cnt_links_simple() {
        let tu = Textunit {
            bi_text: BiText { source: String::from(""),
                              target: String::from(""),
            },
            bi_rtoks: BiRToks {
                source: vec![RTok {s:100, e:101, text: String::from(" ")},
                             RTok {s:102, e:103, text: String::from(" ")},],
                target: vec![RTok {s:300, e:301, text: String::from(" ")},
                             RTok {s:302, e:303, text: String::from(" ")},],
            },
            links: vec![Link {source: 0, target: 1},
                        Link {source: 1, target: 0}],

        };
        let en_sent = RTok {s: 302, e:303, text: String::from(" ")};
        assert_eq!(cnt_links(0, 1, &tu, &en_sent), 1);
    }