Mock server limitations in Postman - Test Execution Trace

Test Overview

This test checks how a Postman mock server responds when a request is made for an endpoint that is not defined in the mock server collection. It verifies that the mock server returns the correct error status and message for undefined routes.

Test Code - Python requests with assert statements

Postman

import requests

mock_server_url = "https://mockserver.postman.com/undefined-endpoint"

response = requests.get(mock_server_url)

assert response.status_code == 404, f"Expected status 404 but got {response.status_code}"
assert "Could not find mock response" in response.text, "Expected error message not found in response"

Execution Trace - 5 Steps

Step	Action	System State	Assertion	Result
1	Test starts	Test environment ready with mock server URL set	-	PASS
2	Send GET request to mock server at undefined endpoint	Mock server receives request for /undefined-endpoint which is not defined	-	PASS
3	Receive response from mock server	Response received with status code 404 and error message	Check if status code is 404	PASS
4	Verify response body contains error message 'Could not find mock response'	Response body contains error message text	Assert error message text present in response	PASS
5	Test ends with all assertions passed	Test completed successfully	-	PASS

Failure Scenario

Failing Condition: Mock server returns a status code other than 404 or missing error message for undefined endpoint

Execution Trace Quiz - 3 Questions

What status code does the Postman mock server return for an undefined endpoint?

A 200 OK

B 500 Internal Server Error

C 404 Not Found

D 302 Redirect

Key Result

Always verify that your mock server returns appropriate error responses for undefined endpoints to catch missing or misconfigured mock routes early.