Data file with Newman in Postman - Test Execution Trace

Test Overview

This test runs a Postman collection using Newman with a data file to provide multiple sets of input. It verifies that the API responds correctly for each data row.

Test Code - Newman

Postman

const newman = require('newman');

newman.run({
    collection: require('./example_collection.json'),
    iterationData: './data.json',
    reporters: ['cli']
}, function (err, summary) {
    if (err) { throw err; }
    const failures = summary.run.failures.length;
    if (failures > 0) {
        console.error(`${failures} tests failed.`);
        process.exit(1);
    } else {
        console.log('All tests passed.');
    }
});

Execution Trace - 5 Steps

Step	Action	System State	Assertion	Result
1	Newman starts running the Postman collection with the data file './data.json'.	Newman CLI initializes and loads the collection and data file.	-	PASS
2	Newman runs the first iteration using the first row of data from the data file.	API request is sent with first data set; response received.	Check if response status is 200 and response body matches expected values for first data row.	PASS
3	Newman runs the second iteration using the second row of data from the data file.	API request is sent with second data set; response received.	Check if response status is 200 and response body matches expected values for second data row.	PASS
4	Newman completes all iterations from the data file and summarizes results.	Summary shows zero failures.	Verify that no test failures occurred during any iteration.	PASS
5	Test script logs 'All tests passed.' and exits with success code.	Console output confirms success.	-	PASS

Failure Scenario

Failing Condition: One or more iterations fail due to incorrect API response or assertion failure.

Execution Trace Quiz - 3 Questions

What does the data file provide to Newman during the test run?

A The test report format

B The Postman collection structure

C Multiple sets of input data for iterations

D The API server URL

Key Result

Using a data file with Newman allows running the same test multiple times with different inputs, improving test coverage and catching edge cases efficiently.