What is the main focus of integration testing?

The main focus of integration testing is to assess the interaction between multiple components of a software system. This stage of testing occurs after unit testing, where individual functions or components are verified for correctness in isolation. During integration testing, the goal is to ensure that these components work together as intended, identifying any issues related to their interactions. This can include interfaces between modules, data flow between systems, and overall system behavior when integrating various parts. Successfully executing integration tests helps to ensure that the system operates as a cohesive whole, rather than just as a collection of individual parts.

In this context, evaluating individual functions is the objective of unit testing rather than integration testing, while checking the user interface is typically addressed in user interface testing, and reviewing documentation is not a direct part of the testing process.