Test N-D FFTs when s is defined and axes are not (#2215)
Test N-D FFTs when s is defined and axes are not (#2215)

Make sure that we are coming up with the right axes when only the output
shape is specified. This exercises both the 2-D and N-D FFT cases. Also
improves the line coverage a bit.
mrocklin/dask,mraspaud/dask,mraspaud/dask,blaze/dask,jcrist/dask,dask/dask,jakirkham/dask,blaze/dask,cpcloud/dask,ContinuumIO/dask,jcrist/dask,ContinuumIO/dask,jakirkham/dask,dask/dask,mrocklin/dask