'Send different forms of size expressions
to ``parse_num``, we expect G(Gigabyte) size results.
:param expr str: A string representing the size expression
:param size int: A string representing the volume size'

@given(expr=volume_expression, size=integers(min_value=75, max_value=100))
def test_parsenum_size(self, expr, size):

    expected_size = int(GiB(size).to_Byte())
    return self.assertEqual(expected_size, int(parse_num((str(size) + expr)).to_Byte()))
