def test_invalid_crc_raises_exception(self):
"""
Checks that having a wrong crc raises an exception.
"""
datagram = b'\x00\x00\x00\xDE\xAD\xDE\xAD\xC0'
with self.assertRaises(serial_datagram.CRCMismatchError):
serial_datagram.decode(datagram)
def test_that_too_short_sequence_raises_exception(self):
"""
Checks that decoding a datagram smaller than 5 bytes (CRC + END) raises
an exception.
"""
with self.assertRaises(serial_datagram.FrameError):
serial_datagram.decode(b'\x01\x02\x03\x03')
def test_escape_is_unescaped(self):
"""
Checks that ESC + ESC_ESC is transformed to ESC.
"""
datagram = b'\xDB\xDD\xC3\x03\xE4\xD1\xC0'
datagram = serial_datagram.decode(datagram)
self.assertEqual(b'\xDB', datagram)
def test_can_decode_simple_datagram(self):
"""
Simply tries to decode a complete datagram.
"""
datagram = b'\x00\x00\x00\xFF\x41\xD9\x12\xC0'
datagram = bytes(datagram)
datagram = serial_datagram.decode(datagram)
self.assertEqual(b'\x00\x00\x00', datagram)
def test_that_weird_sequences_work(self):
"""
Decode order matters. This can be revealed by making a packet
containing ESC + ESC_END, which would cause a problem if the replace
happens in the wrong order.
"""
data = serial_datagram.ESC + serial_datagram.ESC_END
datagram = serial_datagram.encode(data)
self.assertEqual(data, serial_datagram.decode(datagram))
def test_float_single_precision(self):
"""
Checks that floats are single precision.
"""
data = service_call.encode_call("foo", [1.])
data = serial_datagram.decode(data)
# Check that we have the marker for single precision float
self.assertEqual(data[1 + 3 + 1], 0xca)
def test_encoding_method_name(self):
"""
Checks that encoding method works as expected.
"""
data = service_call.encode_call("foo", [1, 2, 3])
data = serial_datagram.decode(data)
u = msgpack.Unpacker(encoding='ascii')
u.feed(data)
command = next(u)
self.assertEqual(command, ['foo', [1, 2, 3]])
def test_encoding_method_name(self):
"""
Checks that encoding method works as expected.
"""
data = service_call.encode_call("foo", [1, 2, 3])
data = serial_datagram.decode(data)
u = msgpack.Unpacker(encoding='ascii')
u.feed(data)
command = next(u)
self.assertEqual(command, ['foo', [1, 2, 3]])
def decode_call(data):
"""
Decodes the given method call.
Returns a tuple containing the method name and the parameters.
"""
data = serial_datagram.decode(data)
u = msgpack.Unpacker(encoding='ascii')
u.feed(data)
command = next(u)
return command[0], command[1]
def decode_call(data):
"""
Decodes the given method call.
Returns a tuple containing the method name and the parameters.
"""
data = serial_datagram.decode(data)
u = msgpack.Unpacker(encoding='ascii')
u.feed(data)
command = next(u)
return command[0], command[1]
def test_end_is_unsescaped(self):
"""
Checks that ESC + ESC_END is transformed to END.
"""
datagram = serial_datagram.decode(b'\xdb\xdcIf-=\xc0')
self.assertEqual(b'\xC0', datagram)
