TST: Expand/rewrite the `test_allnans` tests
TST: Expand/rewrite the `test_allnans` tests

Parametrize w.r.t. the axis, array dimensionality and dtype

rgommers/numpy,endolith/numpy,simongibbons/numpy,seberg/numpy,mattip/numpy,seberg/numpy,pdebuyl/numpy,charris/numpy,pdebuyl/numpy,rgommers/numpy,endolith/numpy,mattip/numpy,rgommers/numpy,jakirkham/numpy,jakirkham/numpy,jakirkham/numpy,jakirkham/numpy,simongibbons/numpy,anntzer/numpy,endolith/numpy,mhvk/numpy,charris/numpy,mhvk/numpy,mhvk/numpy,simongibbons/numpy,seberg/numpy,anntzer/numpy,jakirkham/numpy,simongibbons/numpy,mattip/numpy,mhvk/numpy,anntzer/numpy,pdebuyl/numpy,simongibbons/numpy,charris/numpy,anntzer/numpy,numpy/numpy,charris/numpy,mattip/numpy,numpy/numpy,numpy/numpy,endolith/numpy,seberg/numpy,pdebuyl/numpy,rgommers/numpy,numpy/numpy,mhvk/numpy