added tests for 18951 fix
added tests for 18951 fix

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