A type of testing that verifies how different components or modules of a system work together when combined. Integration tests focus on the interfaces and interactions between units rather than individual functionality.
From Latin 'integratus' meaning 'made whole' and 'test.' Emerged in software engineering in the 1970s as systems became more complex and the need to test component interactions became critical.
Integration testing is like making sure all the musicians in an orchestra can play together harmoniously - each might be perfect individually, but the magic happens when they're synchronized! It catches the problems that only appear when different parts of your system try to communicate.
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