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An essential part of an effective cybersecurity engineering process is testing the implementation of a system for vulnerabilities and validating the effectiveness of countermeasures. The SAE J3061 Cybersecurity Guidebook for Cyber-Physical Vehicle Systems provides a recommended framework which organizations can use to implement a cybersecurity engineering process, which includes activities such as integration and testing, penetration testing and verification/validation of cybersecurity requirements at the hardware, software and system levels. This presentation explores the different kinds of testing that are appropriate at each of these process steps and discusses some important differences between cybersecurity testing and more familiar forms of testing.