Response body inspection in Postman - Test Execution Trace

Test Overview

This test sends a GET request to a sample API endpoint and verifies that the response body contains the expected user data in JSON format.

Test Code - Postman

Postman

pm.test("Response body contains user data", function () {
    pm.response.to.have.status(200);
    const jsonData = pm.response.json();
    pm.expect(jsonData).to.have.property('user');
    pm.expect(jsonData.user).to.have.property('id').that.is.a('number');
    pm.expect(jsonData.user).to.have.property('name').that.is.a('string');
});

Execution Trace - 6 Steps

Step	Action	System State	Assertion	Result
1	Send GET request to https://api.example.com/user/123	Request sent, waiting for response	-	PASS
2	Receive response with status 200 and JSON body	Response body: {"user":{"id":123,"name":"Alice"}}	Check response status is 200	PASS
3	Parse response body as JSON	Parsed JSON object available	-	PASS
4	Verify response JSON has property 'user'	JSON contains 'user' object	Assert jsonData has property 'user'	PASS
5	Verify 'user' object has numeric 'id'	'user.id' is 123	Assert user.id is a number	PASS
6	Verify 'user' object has string 'name'	'user.name' is 'Alice'	Assert user.name is a string	PASS

Failure Scenario

Failing Condition: Response body does not contain 'user' property or 'user.id' is not a number

Execution Trace Quiz - 3 Questions

What does the test check first after receiving the response?

A That the response body is empty

B That the response body contains 'name'

C That the response status is 200

D That the response time is less than 1 second

Key Result

Always verify the response status code before inspecting the response body to ensure the API call was successful.