What is the primary focus of integration testing?

The primary focus of integration testing is to verify how multiple components or systems interact with each other. This stage of testing is crucial because individual components may work perfectly in isolation, but when brought together, they could exhibit unexpected behaviors or failures due to issues in the interface or interaction between them.

Integration testing is conducted after unit testing (where individual components are tested) and before system testing (where the complete system is tested as a whole). Important aspects of integration testing include checking data flow between modules, ensuring proper interaction, and validating that combined functions perform as expected.

In contrast, other testing types mentioned—such as user interface testing, security policies testing, or dynamic functionalities testing—do not emphasize the interactions between various components or systems, which is the essential aim of integration testing. Each of these other types addresses specific characteristics of software but does not encompass the broader focus of integration testing on the collaboration and function of multiple components together.