Fixed another test for np.int8

4 jobs for master in 3 minutes and 17 seconds
Status Name Job ID Coverage
  Test
passed test_minimal #202636

00:00:34

passed test_mpi #202637

00:02:25

passed test_mpi_fftw #202638

00:02:08

passed test_mpi_fftw_hdf5 #202639

00:03:16