[curiousObject]

You are correct that they were testing the system, so they probably waited too long to react. But Tesla’s car didn’t do well in this incident

A competent human driver would instinctively slow down, look at the potential obstruction, and think about changing lanes or an emergency stop.

Most probably, the visible object is just some water spilled on the road or that kind of thing. But if it isn’t then it’s very dangerous

This car appeared to be blind to any risk. That’s not acceptable