What does module testing involve?

Module testing focuses specifically on evaluating individual components of a software application, such as subprograms, subroutines, classes, or procedures. This type of testing is crucial because it allows developers to identify and correct issues in the smallest units of code before they are integrated into larger, more complex systems.

By isolating each module and testing its functionality, performance, and interaction with other modules, testers can ensure that each part of the application works as intended. This process contributes significantly to the overall quality of the software because it reduces the likelihood of bugs arising during later stages of development, such as integration or system testing. The benefits of module testing include easier debugging, better code quality, and improved maintainability.

In contrast, the other options describe testing activities that do not align with the focus of module testing. Testing the entire system entails validating the complete application as a whole, while testing only the user interface disregards the underlying logic and functionality of the program. Lastly, testing the integration of various components involves assessing how well different modules work together rather than evaluating them in isolation, which is the key aspect of module testing.