Getting Started with API Testing: A Practical First Week

Day 1-2: Manual exploration in Postman

Before writing any automated test, understand the API by hand — chain requests, save environments, explore edge cases.

Day 3-4: Write your first automated checks

import requests
 
def test_get_user():
    response = requests.get("https://api.example.com/users/1")
    assert response.status_code == 200
    assert response.json()["id"] == 1

Day 5: Add negative test cases

Don't just test the happy path — missing fields, wrong types, and invalid IDs are where most real bugs live.