REST API testing basics in Testing Fundamentals - Test Execution Trace

Test Overview

This test sends a GET request to a REST API endpoint and verifies that the response status code is 200, indicating success.

Test Code - PyTest

Testing Fundamentals

import requests

def test_get_api_status():
    url = "https://jsonplaceholder.typicode.com/posts/1"
    response = requests.get(url)
    assert response.status_code == 200
    data = response.json()
    assert data["id"] == 1

Execution Trace - 5 Steps

Step	Action	System State	Assertion	Result
1	Test starts	Test environment ready, no network calls made yet	-	PASS
2	Send GET request to https://jsonplaceholder.typicode.com/posts/1	Request sent to the API server	-	PASS
3	Receive response from API	Response received with status code 200 and JSON body	Check if response.status_code == 200	PASS
4	Parse JSON response body	Response body parsed into a dictionary	Check if data["id"] == 1	PASS
5	Test ends successfully	All assertions passed, test completed	-	PASS

Failure Scenario

Failing Condition: API returns a status code other than 200 or the JSON response does not contain the expected id

Execution Trace Quiz - 3 Questions

What does the test verify first after sending the GET request?

A That the response status code is 200

B That the response body is empty

C That the request method is POST

D That the server is offline

Key Result

Always verify both the HTTP status code and the response content to ensure the API behaves as expected.