What is a typical focus of unit testing in a robotics project?

• A. It tests the entire system end-to-end.
• B. It validates system integration with other subsystems.
• C. It focuses on individual components in isolation to verify behavior.
• D. It assesses manufacturing quality.

Answer: (C)

Unit testing focuses on evaluating a single component in isolation, ensuring its behavior is correct without depending on other parts of the system. In a robotics project, this means testing a small piece of code—like a sensor data parser, a motor command translator, or a utility function—that can be tested independently, often with mocks or stubs for any dependencies. This approach gives fast feedback and makes it easier to pinpoint where a problem originates, since failures point to that specific unit rather than to interactions across the whole system.

Other testing goals look at broader scope: end-to-end tests exercise the entire robot from input to final action; integration tests verify that multiple subsystems work together; manufacturing quality checks focus on production reliability. Those are important for overall reliability, but unit testing is about validating the correctness of individual pieces in isolation.