What testing is used for API testing?

Functional testing (checking requests and responses). Non-functional testing:

• Performance testing (load, stress).
• Security testing (authentication, authorization).
• Reliability testing (error handling).
• Compatibility testing (various clients, API versions).
• Usability testing (documentation).

Main types of tests for API:

• Unit tests: Checking individual components (functions, methods).
• Integration tests: Checking interaction between API components or between API and other systems.
• Acceptance tests: End-to-end testing of user flow through API.

Tools for API testing: Postman, SoapUI, ReadyAPI, curl, automation libraries (RestAssured, Requests).

Example of checking response status using the Requests library in Python:

import requests

url = "https://api.example.com/resource"
response = requests.get(url)

assert response.status_code == 200 # Check that the request was successful