def test_empty_packet(self):
packet1 = xi.XIPacket()
packet2 = xi.XIPacket()
# two empty packets should have the same size
self.assertEqual(packet1.length, packet2.length)
# empty packet should have a payload length of zero in the packet header
self.assertEqual(len(packet1.payload), 0)
self.assertEqual(packet1.header.payloadLength, 0)
def test_crc(self):
payloadLength = 1000
packet1 = xi.XIPacket(
buffer="".join([chr(x % 0xFF) for x in range(payloadLength)]))
packet2 = xi.XIPacket(
buffer="".join([chr(x % 0xFF) for x in range(payloadLength)]))
self.assertEqual(packet1.header.payloadLength,
packet2.header.payloadLength)
self.assertEqual(packet1.header.crc, packet2.header.crc)
self.assertEqual(packet1.crc, packet2.crc)
def test_packet_creation(self):
payloadLength = xi.XIPacket.maxPayload()
packet1 = xi.XIPacket(
buffer="".join([chr(x % 0xFF) for x in range(payloadLength)]))
packet2 = xi.XIPacket.createXIPacket(packet1.rep)
self.assertEqual(packet1.rep, packet2.rep)
packet1 = xi.XIPacket(buffer="Hello World")
packet2 = xi.XIPacket.createXIPacket(packet1.rep)
self.assertEqual(packet1.rep, packet2.rep)
def test_create_header(self):
# tests the .rep property to ensure that
# a new XIPacket can be created by the string rep
# of an existing XIPacket.
packet1 = xi.XIPacket()
packet2 = xi.XIPacket.createXIPacket(packet1.rep)
self.assertEqual(packet1.rep, packet2.rep)
def test_bad_packet_creation(self):
payloadLength = xi.XIPacket.maxPayload()
packet1 = xi.XIPacket(
buffer="".join([chr(x % 0xFF) for x in range(payloadLength)]))
# act as though the message was interrupted
packet2 = xi.XIPacket.createXIPacket(packet1.rep[0:payloadLength / 2])
self.assertIsNone(packet2)
def test_packet_w_str_buffer(self):
packet1 = xi.XIPacket(buffer="hello world")
payloadLength = len(packet1.payload)
self.assertEqual(len(packet1.payload), payloadLength)
self.assertEqual(packet1.header.payloadLength, payloadLength)
self.assertGreaterEqual(packet1.crc, 0)
self.assertLessEqual(packet1.crc, 255)
self.assertGreaterEqual(packet1.header.crc, 0)
self.assertLessEqual(packet1.header.crc, 255)
def test_packet_w_valid_buffer(self):
payloadLength = 1000
packet1 = xi.XIPacket(
buffer="".join([chr(x % 0xFF) for x in range(payloadLength)]))
self.assertEqual(len(packet1.payload), payloadLength)
self.assertEqual(packet1.header.payloadLength, payloadLength)
self.assertGreaterEqual(packet1.crc, 0)
self.assertLessEqual(packet1.crc, 255)
self.assertGreaterEqual(packet1.header.crc, 0)
self.assertLessEqual(packet1.header.crc, 255)
def test_non_default_values(self):
seqNumBits = xi.XIPacketHeader()._seq_num_bit_length
# test all possible type, src, dst, seq num combinations
for _type in [
xi.PACKET_TYPE.ACK, xi.PACKET_TYPE.CONNECTION,
xi.PACKET_TYPE.DATA
]:
for seqNum in range(2**seqNumBits):
payloadLength = xi.XIPacket.maxPayload()
packet1 = xi.XIPacket(type=_type,
seqNum=seqNum,
buffer="".join([
chr(x % 0xFF)
for x in range(payloadLength)
]))
packet2 = xi.XIPacket.createXIPacket(packet1.rep)
self.assertEqual(packet1.rep, packet2.rep)
def test_init(self):
self.assertNotEqual(xi.XIPacket(), None)