"Airbus tests extended-length wings to see if it's worth developing the technology to produce folding versions of the same"
No, they are not testing these wings in the present, they are planning to test them in the future:
"Over the next three years, Airbus will design, build and flight test full scale wing extensions."
alt Hacker News
No, they are not testing these wings in the present, they are planning to test them in the future:
"Over the next three years, Airbus will design, build and flight test full scale wing extensions."