What is the focus of unit testing?

Unit testing specifically focuses on validating individual components or modules of a software application. This approach allows developers to ensure that each part of the code functions correctly in isolation before integrating it with other components. By testing specific functions or methods, unit testing helps identify bugs and issues at an early stage, making it easier to maintain code quality.

Ensuring that small units of code behave as intended contributes to the overall reliability of the application. This methodology is crucial for supporting practices such as continuous integration and continuous deployment, where regular testing helps maintain a stable codebase. In contrast, testing the entire application, user experience, or deployment process involves broader scopes that are beyond the specific intent of unit testing.