JSON body in Postman - Test Execution Trace

Test Overview

This test sends a POST request with a JSON body to an API endpoint and verifies the response status and content.

Test Code - PyTest

Postman

import requests
import json

def test_post_json_body():
    url = "https://api.example.com/users"
    headers = {"Content-Type": "application/json"}
    payload = {
        "name": "Alice",
        "email": "[e-mail]",
        "age": 30
    }
    response = requests.post(url, headers=headers, json=payload)
    assert response.status_code == 201
    response_json = response.json()
    assert response_json.get("id") is not None
    assert response_json.get("name") == "Alice"

Execution Trace - 6 Steps

Step	Action	System State	Assertion	Result
1	Test starts	Test environment ready, no requests sent yet	-	PASS
2	Sends POST request to https://api.example.com/users with JSON body {"name": "Alice", "email": "[e-mail]", "age": 30}	Request sent, waiting for response	-	PASS
3	Receives response with status code 201 and JSON body containing user data	Response received: {"id": "12345", "name": "Alice", "email": "[e-mail]", "age": 30}	Check response status code is 201	PASS
4	Parses response JSON and verifies 'id' field is present	Response JSON parsed	Assert 'id' field is not None	PASS
5	Verifies 'name' field in response JSON equals 'Alice'	Response JSON parsed	Assert 'name' == 'Alice'	PASS
6	Test ends successfully	All assertions passed	-	PASS

Failure Scenario

Failing Condition: Response status code is not 201 or 'id' field missing in response JSON

Execution Trace Quiz - 3 Questions

What does the test verify after sending the POST request?

A Response status code is 200 and response JSON contains 'email'

B Response status code is 201 and response JSON contains 'id' and correct 'name'

C Response status code is 404 and response JSON is empty

D Response status code is 500 and response JSON contains error message

Key Result

Always verify both the HTTP status code and the response body content to ensure the API behaves as expected when sending JSON data.