def METHOD_NAME(self):
    N = 1975
    a = np.zeros(N)
    # Test all zff offered in OWFFT()
    for zff in (2**n for n in range(10)):
        a_zf = zero_fill(a, zff)
        N_zf = a_zf.size
        # Final array must be power of 2
        assert np.log2(N_zf) == int(np.log2(N_zf))
        # Final array should be >= N * zff
        assert N_zf >= N * zff