Yes, there is no exemption rule in place for test drive plates. They are subject to the e-vignette according to their category.
Vehicles (and vehicle + trailer combinations) that have a total permissible weight of over 3.5 tonnes use the distance based toll system (HU-GO).
You can order your Hungarian e-vignette now comfortably here.
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What vehicles need a Hungarian motorway vignette?
Which roads require a Hungarian e-vignette?
What happens if I drive without a Hungarian vignette?
What different types of the Hungarian motorway e-vignette are available?
Can I drive into Hungary without a vignette if I avoid motorways?