def test_get_offset_0_bit():
"""get_offset should return None if no bits are allocated to an offset"""
nose.assert_is_none(
sim.get_offset('10110100', num_offset_bits=0))
def test_get_offset_2_bit():
"""get_offset should return correct 2 offset bits for an address"""
nose.assert_equal(
sim.get_offset('11111101', num_offset_bits=2),
'01')