What APIs are and why testing them matters in Postman - Test Execution Trace

Test Overview

This test sends a GET request to a sample API endpoint and verifies the response status code is 200. It checks that the API is working and returning data correctly.

Test Code - Postman

Postman

pm.test("Status code is 200", function () {
    pm.response.to.have.status(200);
});

Execution Trace - 5 Steps

Step	Action	System State	Assertion	Result
1	Test starts	Postman app is open with the GET request prepared	-	PASS
2	Send GET request to https://jsonplaceholder.typicode.com/posts/1	Request sent, waiting for response	-	PASS
3	Receive response with status code 200 and JSON body	Response received with data for post id 1	Check response status code is 200	PASS
4	Run test script to verify status code	Test script executed in Postman test tab	pm.response.to.have.status(200)	PASS
5	Test completes successfully	Test result shows PASS in Postman	-	PASS

Failure Scenario

Failing Condition: API returns a status code other than 200, e.g., 404 Not Found

Execution Trace Quiz - 3 Questions

What does the test verify in this API test?

A The API returns status code 200

B The API returns a JSON body with user data

C The API response time is less than 1 second

D The API requires authentication

Key Result

Always verify the API response status code to confirm the API endpoint is reachable and functioning as expected before testing response data.