Integration testing checks that separate parts of a system work correctly together. Typical targets are a service and its database, a message queue or another team's API, rather than each piece alone.
Microservices is an architectural style in which an application is built as a set of small, independently deployable services. Each owns a specific business capability and its own data, and talks to the others over the network.
A QA engineer makes sure software works as intended before and after release, designing test strategies, writing automated tests and finding defects. QA means quality assurance, and teams often hire one when escaped bugs start reaching customers.
Test automation is the use of software to run tests, compare results with expectations and report failures without manual effort. It lets teams check every change quickly and consistently.
Unit testing is the practice of writing small automated tests that check individual functions, classes or modules in isolation. They run in milliseconds and catch regressions as soon as code changes.
Refactoring is the practice of improving the internal structure of existing code without changing what it does for users. The goal is code that is easier to read, test and extend.
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