def test_data(self, shiftN, N1):
sig = self.s[0]
syms = self.s.symbols[0]
sig2 = np.roll(sig, shift=shiftN)
offset = ber_functions.find_sequence_offset(syms[:N1], sig2)
sig2 = np.roll(sig2, offset)
npt.assert_allclose(syms[:N1], sig2[:N1], atol=self.d/4)
def test_shift(self, shiftN, snr, N1):
sig = impairments.change_snr(self.s, self.s.fb, self.s.fs, snr)
sig = sig[0]
syms = sig.symbols[0]
sig2 = np.roll(sig, shift=shiftN)
offset = ber_functions.find_sequence_offset(syms[:N1], sig2)
assert (offset == -shiftN) or ((3*10**4 - offset )== shiftN)
def test_ints_shift2(self, shiftN, N1):
b = np.random.randint(0,2, 2**16)
b2 = np.roll(b, shift=shiftN)
offset = ber_functions.find_sequence_offset(b, b2[:N1])
assert (shiftN == -offset) or (shiftN+offset == 2**16)
