What is the primary focus of integration testing?

Integration testing primarily focuses on identifying issues that arise in the interactions between different components or modules of a system. During this phase, individual components, which may have been tested in isolation during unit testing, are combined and tested collectively. The objective is to ensure that these components work together as intended and that their interactions do not introduce any faults.

This type of testing checks for problems such as miscommunication between modules, incorrect data passing, or failure to process information as expected when multiple components operate together. By emphasizing the relationships and interfaces of components, integration testing aims to catch issues that could be overlooked when components are considered separately.

In contrast, ensuring all functionalities of a system falls more in line with system testing, while verifying the security of input data pertains to security testing processes. Assessing overall system performance involves performance testing, which looks at how well the system operates under various conditions. These distinctions clarify the specific role of integration testing in the software development lifecycle.