API Testing
REST API testing with Postman, REST Assured and more
JMeter Tutorial: Performance Testing, Assertions, Correlation and Non-GUI Runs
JMeter tutorial for testers: test plan structure, thread groups, samplers, assertions, correlation with extractors, non-GUI runs.
WireMock Tutorial: API Mocking, Stubs, Docker and Webhook Testing
WireMock tutorial with Java: stubbing APIs, verifying requests, request templating, running WireMock in Docker for CI.
Database Validation in API Testing: Verifying API Calls with JDBC and SQL
How to verify that API calls really change the database: JDBC helpers, SQL assertions after create, update and delete calls.
API Testing Checklist: What to Test for Every Endpoint (+ Negative Test Catalog)
A complete API testing checklist: functional, negative, security, performance and contract checks for every endpoint, plus a catalog of negative test cases.
API Testing with Selenium? Why Not, and How to Combine Selenium with REST Assured
Can Selenium do API testing? Why not, and four ways to combine it with REST Assured: API test data, API login, backend checks after UI actions, link checks.
GraphQL API Testing: A Practical Guide for Testers (Postman & REST Assured)
How to test GraphQL APIs: queries, mutations, the HTTP 200 error trap, field-level authorization and depth limits, with Postman and REST Assured examples.