You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: conformance_tests.rs
    path of file: ./repos/rust-unic/unic/normal/tests
    
    the code of the file until where you have to start completion: // Copyright 2015 The Servo Project Developers.
// Copyright 2017 The UNIC Project Developers.
//
// See the COPYRIGHT file at the top-level directory of this distribution.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

#![cfg(test)]

use unic_normal::StrNormalForm;

type TestDatum = (
    &'static str,
    &'static str,
    &'static str,
    &'static str,
    &'static str,
);
const TEST_DATA: &[TestDatum] = include!("tables/conformance_tests_data.rsv");

#[test]
fn test_nfc_nfd_nfkc_nfkd() {
    macro_rules! norm_string {
    
fn test_nfc_nfd_nfkc_nfkd() {
    macro_rules! norm_string {
        ($method: ident, $input: expr) => {
            $input.$method().collect::<String>()
        };
    }

    for &(s1, s2, s3, s4, s5) in TEST_DATA {
        // these invariants come from the CONFORMANCE section of
        // https://www.unicode.org/Public/UNIDATA/NormalizationTest.txt

        // NFC
        {
            let r1 = norm_string!(nfc, s1);
            let r2 = norm_string!(nfc, s2);
            let r3 = norm_string!(nfc, s3);
            let r4 = norm_string!(nfc, s4);
            let r5 = norm_string!(nfc, s5);
            assert_eq!(s2, &r1[..]);
            assert_eq!(s2, &r2[..]);
            assert_eq!(s2, &r3[..]);
            assert_eq!(s4, &r4[..]);
            assert_eq!(s4, &r5[..]);
        }

        // NFD
        {
            let r1 = norm_string!(nfd, s1);
            let r2 = norm_string!(nfd, s2);
            let r3 = norm_string!(nfd, s3);
            let r4 = norm_string!(nfd, s4);
            let r5 = norm_string!(nfd, s5);
            assert_eq!(s3, &r1[..]);
            assert_eq!(s3, &r2[..]);
            assert_eq!(s3, &r3[..]);
            assert_eq!(s5, &r4[..]);
            assert_eq!(s5, &r5[..]);
        }

        // NFKC
        {
            let r1 = norm_string!(nfkc, s1);
            let r2 = norm_string!(nfkc, s2);
            let r3 = norm_string!(nfkc, s3);
            let r4 = norm_string!(nfkc, s4);
            let r5 = norm_string!(nfkc, s5);
            assert_eq!(s4, &r1[..]);
            assert_eq!(s4, &r2[..]);
            assert_eq!(s4, &r3[..]);
            assert_eq!(s4, &r4[..]);
            assert_eq!(s4, &r5[..]);
        }

        // NFKD
        {
            let r1 = norm_string!(nfkd, s1);
            let r2 = norm_string!(nfkd, s2);
            let r3 = norm_string!(nfkd, s3);
            let r4 = norm_string!(nfkd, s4);
            let r5 = norm_string!(nfkd, s5);
            assert_eq!(s5, &r1[..]);
            assert_eq!(s5, &r2[..]);
            assert_eq!(s5, &r3[..]);
            assert_eq!(s5, &r4[..]);
            assert_eq!(s5, &r5[..]);
        }
    }
}