As I have said before, there are very good reasons why Airbus specify that this test MUST be carried out at FL140 and not less than 10000 ft AGL. They tried to do it at low level and suffered the consequences.
They simply were not qualified to conduct a test flight and did not understand what they were doing and it bit them on the
.
Any sane test pilot expects any test to fail, they expected to tick a box.