What is the strategy called when teams test their classes independently?

The strategy where teams test their classes independently is referred to as unit testing. This approach focuses on validating individual components or pieces of source code to ensure they work as intended. Unit tests are typically written by developers during the development process and are used to catch bugs early, verify that the logic of the code is functioning correctly, and facilitate changes to the code over time without the risk of breaking existing functionality.

Unit testing is essential in maintaining the integrity of the software as it allows developers to isolate specific parts of the code and test them individually, ensuring that each unit operates as expected. This makes the debugging process more efficient, since issues can be identified at a granular level right after the component has been developed. Such a focused testing approach supports Agile methodologies where iterations of code development are frequent, emphasizing the importance of regularly tested code for overall project quality.