The IEEE 802.3 published the 802.3cz Multi-Gigabit Glass Optical Fiber Automotive Ethernet standard with physical-layer specs and management parameters in 2023. It covers 2.5-, 5-, 10-, 25-, and 50-Gb/s operation over glass optical fiber in an automotive environment. This article will provide an overview of the physical-layer test systems and test requirements as outlined in the IEEE 802.3cz standard.