Fix test_fftw

Author: mikaem

tests/test_fftw.py

@@ -3,6 +3,7 @@
 import numpy as np
 from scipy.fftpack import dctn as scipy_dctn
 from scipy.fftpack import dstn as scipy_dstn
+import scipy.fftpack
 from mpi4py_fft import fftw
 
 has_pyfftw = True