def test_byte_at_raises_error_beyond_data_bounds(self):
'''
The byte_at method should raise an IndexError when attempting
to read a byte beyond the bounds of the BitPack.
'''
bp = BitPack(base64.encodestring(b'\x00'))
with self.assertRaises(IndexError):
bp.byte_at(1)
def test_byte_at_happy_path(self):
'''
The byte_at method should return a numeric representation of
the byte at a given index.
'''
bp = BitPack(base64.encodestring(b'\x00\x01\x02\x03\xff\xab'))
self.assertEqual(bp.byte_at(0), 0)
self.assertEqual(bp.byte_at(1), 1)
self.assertEqual(bp.byte_at(2), 2)
self.assertEqual(bp.byte_at(3), 3)
self.assertEqual(bp.byte_at(4), 0xff)
self.assertEqual(bp.byte_at(5), 0xab)