Defining mock responses in Postman - Test Execution Trace

Test Overview

This test checks that a Postman mock server returns the correct predefined response when a specific API request is made. It verifies the mock response status and body content.

Test Code - Postman Test Scripts

Postman

pm.test('Mock response returns status 200', () => {
    pm.response.to.have.status(200);
});

pm.test('Mock response body contains expected message', () => {
    const jsonData = pm.response.json();
    pm.expect(jsonData.message).to.eql('Hello from mock server');
});

Execution Trace - 3 Steps

Step	Action	System State	Assertion	Result
1	Send GET request to Postman mock server endpoint	Postman sends request to mock server URL configured with predefined response	-	PASS
2	Receive HTTP response from mock server	Response status 200 and body {"message": "Hello from mock server"} received	Check response status is 200	PASS
3	Parse response JSON and verify 'message' field	Response JSON parsed successfully	Verify response body message equals 'Hello from mock server'	PASS

Failure Scenario

Failing Condition: Mock server returns a different status code or response body than expected

Execution Trace Quiz - 3 Questions

What does the test verify first after sending the request?

A Response headers contain Content-Type

B Response time is less than 1 second

C Response status code is 200

D Response body contains a list

Key Result

Always verify that your mock server is configured with the correct response for the exact request URL to ensure reliable and predictable test results.