def test_decompose_n_bits():
n4 = Bn(4)
assert decompose_into_n_bits(n4, 4) == [0, 0, 1, 0]
n3 = Bn(3)
assert decompose_into_n_bits(n3, 6) == [1, 1, 0, 0, 0, 0]
n5 = Bn(5)
assert decompose_into_n_bits(n5, 4) == [1, 0, 1, 0]
def test_decompose_n_bits_negative():
n4 = Bn(-2)
with pytest.raises(Exception):
decompose_into_n_bits(n4, 3)
def test_decompose_n_bits_too_big():
n4 = Bn(9)
with pytest.raises(Exception):
decompose_into_n_bits(n4, 3)