Running iterations selectively with Newman - postman

Question

I want to run selective iterations from my test file. Say, iterations 10-14. Is there a switch in Newman that I can use to give these inputs. The closest I came is to select the number of iterations to run for which the command is -n (Reference here). But this runs all iterations from 1 to n. I want to be able to change the starting and end values.

Answer 1

As #Danny mentioned There is no inbuilt way to specify a specific iteration row to be executed using Newman but can be done using Powershell or by using Newman as a library.
The approaches are as below
Powershell:
here we read the actual csv file in the current directory using import csv
Then considers only row 1..2 , if you just want 1 row you can change $a[1..2] to
$[1]
$a= Import-Csv .\a.csv
$a[1..2] | Select-Object * | export-csv -Path .\temp.csv -NoTypeInformation
newman run .\test.postman_collection.json -d .\temp.csv
As library:
here we read and split the csv as we want using csv parser and then write it back to a temp file as csv using csv-stringify library.
First, install:
npm install csv
npm install fs
npm i fs-extra
npm install newman
Then use the below code
const newman = require('newman'); // require newman in your project
const stringify = require('csv-stringify')
const parse = require('csv-parse/lib/sync')
const fs = require("fs")
// call newman.run to pass `options` object and wait for callback
let data = fs.readFileSync('./a.csv',
{ encoding: 'utf8', flag: 'r' });
data = parse(data, {
columns: true,
skip_empty_lines: true
})
console.log(data)
//index doesn't consider header so 0 is first data row
stringify(data.slice(0, 2), {
header: true
}, function (err, output) {
fs.writeFileSync("temp.csv", output);
newman.run({
collection: require('./test.postman_collection.json'),
reporters: 'cli',
iterationData: "./temp.csv"
}, function (err) {
if (err) { throw err; }
console.log('collection run complete!');
});
})