When testing automated systems, you may face certain challenges depending on the complexity, variability, and uncertainty of your system and its environment. Test coverage, test data, and test feedback are three common challenges that can be affected by various factors. Test coverage refers to the extent of your testing methods and tools being able to cover all possible scenarios, conditions, and outcomes of your system's operation and performance. Factors such as time, cost, resources, or feasibility can influence test coverage. Test data refers to the quality, quantity, and availability of the data used to test your system's functionality, performance, and behavior. Accuracy, relevance, diversity, or security are factors that can affect test data. Test feedback is the effectiveness, efficiency, and timeliness of the feedback you receive from your testing methods and tools regarding results, issues, or improvements of your system's operation and performance. Clarity, completeness, consistency, or actionability are factors that can influence test feedback.