def test_get_tag_0_bit():
"""get_tag should return None if no bits are allocated to a tag"""
nose.assert_is_none(
sim.get_tag('10110100', num_tag_bits=0))
def test_get_tag_5_bit():
"""get_tag should return correct 5 tag bits for an address"""
nose.assert_equal(
sim.get_tag('10110100', num_tag_bits=5),
'10110')
