k6 CSV generator

/*To generate a log file e.g.  k6 run the-best-tests.js --log-format raw --log-output=file="./log_$(((get-date).ToUniversalTime()).ToString("yyyyMMddTHHmmssZ")).txt"
'./outfile_en_GB.txt' is a plaiin text file with one 'address' per line (auto generated with Bogus), cut down to (poorly) emulate autocomplete strings.
585 Favian Flats, South Joe
015 Hermis
64348 Candace Corner, North Kirstin, Nor
8528
49202 Guiseppe Ranch, Beierha
8270 Krista Well,
1028 Braden Estate, Julietfor
2146 Hellen Key, S
78838 Rau Plaza, Port Gwenburgh
6532 Cleo Underpass, New Frankietown, Falkland Islands (Ma
76290 Rutherford Ranch, Lockmanhaven
28463 Erdman Meadow
8502 Levi Islands, Keny
51686 Ebony Stravenue, Ru
493 R
84928 Collier
6971 Hettinger Light, Taylorchester,
69877 Furman Ke
65374 Ansel Union, Ulicesbo
305 Zaria Glen, North Tessiel
50725 Tara Walks, Port Kor
054 Jacobs Light, Georgestad,
891
17310 Macejkovic View, South M
21439 Dayna Port, New Avishaven, Saint Kitt
9258 Dillan Viaduc
9998 Blanda Ov
9021 Clotilde Estate, Providenciburgh, Solomon Isla
3844 Domenick Plains, Port Berylchester, Th
35914 Li
07025 Ks

*/
import { SharedArray } from 'k6/data';
import { scenario } from 'k6/execution';
import { check, fail }from 'k6'
import http from 'k6/http';
import { URL } from 'https://jslib.k6.io/url/1.0.0/index.js';
import { randomIntBetween } from 'https://jslib.k6.io/k6-utils/1.2.0/index.js';
const textData = new SharedArray('AddressData', function () {
   return open('./outfile_en_GB.txt').split(/\r?\n/);
});
export const options = {
    scenarios: {
        'use-all-the-data': {
            executor: 'shared-iterations',
            vus: 5,
            iterations: 100,//csvData.length,
            maxDuration: '30s',
        },
    }
};

export default function () {
    // this is unique even in the cloud

    const address = textData[scenario.iterationInTest];
    var flipBit = randomIntBetween(0,100);
   var urlStr = "https://httpstat.us/200";
    switch (true) {
        case (flipBit < 50 ):
            urlStr ="https://httpstat.us/200";
            break;
        case (flipBit <75):
            urlStr ="https://httpstat.us/418";
            break;
        case (flipBit < 90):
            urlStr ="https://httpstat.us/503";
            break;
        case (flipBit < 100):
            urlStr ="https://httpstat.us/404";
            break;

    }
    const url = new URL(urlStr  );
    url.searchParams.append('address', address);
    const res = http.get(url.toString());
    if ( !check(res, {
            'status code MUST be 200': (res) => res.status === 200,
         })
     ) {
        console.log(`${scenario.iterationInTest}, \"${address}\", ${res.url} , ${res.status}`);
     }
}