JSON value assertions in Postman - Test Execution Trace

Test Overview

This test sends a GET request to a sample API endpoint and verifies that the JSON response contains specific values. It checks that the user ID is 1 and the username is 'Bret'.

Test Code - Postman

Postman

pm.test("Verify JSON response values", () => {
    const jsonData = pm.response.json();
    pm.expect(jsonData.id).to.eql(1);
    pm.expect(jsonData.username).to.eql("Bret");
});

Execution Trace - 5 Steps

Step	Action	System State	Assertion	Result
1	Send GET request to https://jsonplaceholder.typicode.com/users/1	Request sent, waiting for response	-	PASS
2	Receive JSON response with user data	Response body contains JSON with fields including id and username	-	PASS
3	Parse JSON response to extract fields	jsonData object created with response values	-	PASS
4	Assert that jsonData.id equals 1	jsonData.id is 1	pm.expect(jsonData.id).to.eql(1)	PASS
5	Assert that jsonData.username equals 'Bret'	jsonData.username is 'Bret'	pm.expect(jsonData.username).to.eql("Bret")	PASS

Failure Scenario

Failing Condition: The JSON response contains a different user ID or username than expected

Execution Trace Quiz - 3 Questions

What does the test verify about the JSON response?

A That the JSON response is empty

B That the response status is 404

C That the user ID is 1 and username is 'Bret'

D That the user email is '[e-mail]'

Key Result

Always verify specific JSON values in API responses to ensure the API returns correct data, using clear and direct assertions.