"Error injection testing" in automated testing means:

1. _Fault injection_: Automated tests deliberately introduce faults or errors into the device or system.

2. _Error simulation_: Automated tests simulate errors or faults to test device behavior.

3. _Failure mode testing_: Automated tests intentionally cause device failures to test recovery and error handling.

4. _Robustness testing_: Automated tests evaluate device robustness by introducing errors or faults.

5. _Resilience testing_: Automated tests assess device resilience by simulating errors or faults.

6. _Recovery testing_: Automated tests verify device recovery from errors or faults.

7. _Edge case testing_: Automated tests explore extreme scenarios by introducing errors or faults.

8. _Chaos engineering_: Automated tests intentionally introduce failures or errors to test system resilience.

Error injection testing in automated testing ensures devices can handle errors and faults gracefully, maintaining functionality and recovering correctly.