Newman installation in Postman - Test Execution Trace

Test Overview

This test checks if Newman, the command-line tool for running Postman collections, is installed correctly on the system and can run a simple collection.

Test Code - Python unittest style with subprocess

Postman

import subprocess
import json

# Run 'newman -v' to check Newman version
result_version = subprocess.run(['newman', '-v'], capture_output=True, text=True)
assert result_version.returncode == 0, 'Newman is not installed or not found in PATH'

# Run a simple Newman command to run a sample collection
sample_collection = '{"info":{"name":"Sample Collection","_postman_id":"12345","schema":"https://schema.getpostman.com/json/collection/v2.1.0/collection.json"},"item":[{"name":"Sample Request","request":{"method":"GET","url":"https://postman-echo.com/get"}}]}'

with open('sample_collection.json', 'w') as f:
    f.write(sample_collection)

result_run = subprocess.run(['newman', 'run', 'sample_collection.json'], capture_output=True, text=True)
assert result_run.returncode == 0, 'Newman failed to run the collection'

# Clean up
import os
os.remove('sample_collection.json')

Execution Trace - 4 Steps

Step	Action	System State	Assertion	Result
1	Run 'newman -v' command to check if Newman is installed	Terminal executes 'newman -v', Newman version string is returned	Check that return code is 0 indicating Newman is found	PASS
2	Create a simple Postman collection JSON file named 'sample_collection.json'	File 'sample_collection.json' is created with a GET request to https://postman-echo.com/get	-	PASS
3	Run 'newman run sample_collection.json' to execute the collection	Newman runs the collection and outputs run summary	Check that return code is 0 indicating successful run	PASS
4	Delete the 'sample_collection.json' file to clean up	File is removed from the system	-	PASS

Failure Scenario

Failing Condition: Newman is not installed or not found in system PATH

Execution Trace Quiz - 3 Questions

What does the test check first to confirm Newman is installed?

A Runs 'newman -v' to get Newman version

B Runs a Postman collection directly

C Checks if 'newman' folder exists

D Runs 'npm install newman'

Key Result

Always verify that command-line tools are installed and accessible in the system PATH before running tests that depend on them.