And frankly, stating you don’t test bathtubs because they might leak is a weak excuse. I test them no matter which floor they are installed, unless there is a disclosed (or discovered) issue that prevents it.
I have found plenty of hydro-tubs that leak only when they are filled above the jets, or operating (turned “On”).
Some that only leak while operating, but don’t leak when “Off”.
And some that make “noise” but don’t pump water, etc.
It’s often visible at the access or maintenance hatch (if present, and yes there are many that don’t have the required access).