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#!/usr/bin/env python
"""
This module is testing the serial interface.
Copyright: 2017 Boris Wenzlaff
"""
import
unittest
from
unittest
.
mock
import
patch
import
can
from
can
.
interfaces
.
serial
.
serial_can
import
SerialBus
from
.
message_helper
import
ComparingMessagesTestCase
from
.
config
import
IS_PYPY
# Mentioned in #1010
TIMEOUT
=
0.5
if
IS_PYPY
else
0.1
# 0.1 is the default set in SerialBus
class
SerialDummy
:
"""
Dummy to mock the serial communication
"""
msg
=
None
def
__init__
(
self
):
self
.
msg
=
bytearray
()
def
read
(
self
,
size
=
1
):
return_value
=
bytearray
()
for
i
in
range
(
size
):
return_value
.
append
(
self
.
msg
.
pop
(
0
))
return
bytes
(
return_value
)
def
write
(
self
,
msg
):
self
.
msg
=
bytearray
(
msg
)
def
reset
(
self
):
self
.
msg
=
None
class
SimpleSerialTestBase
(
ComparingMessagesTestCase
):
MAX_TIMESTAMP
=
0xFFFFFFFF
/
1000
def
__init__
(
self
):
ComparingMessagesTestCase
.
__init__
(
self
,
allowed_timestamp_delta
=
None
,
preserves_channel
=
True
)
def
test_rx_tx_min_max_data
(
self
):
"""
Tests the transfer from 0x00 to 0xFF for a 1 byte payload
"""
for
b
in
range
(
0
,
255
):
msg
=
can
.
Message
(
data
=
[
b
])
self
.
bus
.
send
(
msg
)
msg_receive
=
self
.
bus
.
recv
()
self
.
assertMessageEqual
(
msg
,
msg_receive
)
def
test_rx_tx_min_max_dlc
(
self
):
"""
Tests the transfer from a 1 - 8 byte payload
"""
payload
=
bytearray
()
for
b
in
range
(
1
,
9
):
payload
.
append
(
0
)
msg
=
can
.
Message
(
data
=
payload
)
self
.
bus
.
send
(
msg
)
msg_receive
=
self
.
bus
.
recv
()
self
.
assertMessageEqual
(
msg
,
msg_receive
)
def
test_rx_tx_data_none
(
self
):
"""
Tests the transfer without payload
"""
msg
=
can
.
Message
(
data
=
None
)
self
.
bus
.
send
(
msg
)
msg_receive
=
self
.
bus
.
recv
()
self
.
assertMessageEqual
(
msg
,
msg_receive
)
def
test_rx_tx_min_id
(
self
):
"""
Tests the transfer with the lowest arbitration id
"""
msg
=
can
.
Message
(
arbitration_id
=
0
)
self
.
bus
.
send
(
msg
)
msg_receive
=
self
.
bus
.
recv
()
self
.
assertMessageEqual
(
msg
,
msg_receive
)
def
test_rx_tx_max_id
(
self
):
"""
Tests the transfer with the highest arbitration id
"""
msg
=
can
.
Message
(
arbitration_id
=
536870911
)
self
.
bus
.
send
(
msg
)
msg_receive
=
self
.
bus
.
recv
()
self
.
assertMessageEqual
(
msg
,
msg_receive
)
def
test_rx_tx_max_timestamp
(
self
):
"""
Tests the transfer with the highest possible timestamp
"""
msg
=
can
.
Message
(
timestamp
=
self
.
MAX_TIMESTAMP
)
self
.
bus
.
send
(
msg
)
msg_receive
=
self
.
bus
.
recv
()
self
.
assertMessageEqual
(
msg
,
msg_receive
)
self
.
assertEqual
(
msg
.
timestamp
,
msg_receive
.
timestamp
)
def
test_rx_tx_max_timestamp_error
(
self
):
"""
Tests for an exception with an out of range timestamp (max + 1)
"""
msg
=
can
.
Message
(
timestamp
=
self
.
MAX_TIMESTAMP
+
1
)
self
.
assertRaises
(
ValueError
,
self
.
bus
.
send
,
msg
)
def
test_rx_tx_min_timestamp
(
self
):
"""
Tests the transfer with the lowest possible timestamp
"""
msg
=
can
.
Message
(
timestamp
=
0
)
self
.
bus
.
send
(
msg
)
msg_receive
=
self
.
bus
.
recv
()
self
.
assertMessageEqual
(
msg
,
msg_receive
)
self
.
assertEqual
(
msg
.
timestamp
,
msg_receive
.
timestamp
)
def
test_rx_tx_min_timestamp_error
(
self
):
"""
Tests for an exception with an out of range timestamp (min - 1)
"""
msg
=
can
.
Message
(
timestamp
=
-
1
)
self
.
assertRaises
(
ValueError
,
self
.
bus
.
send
,
msg
)
def
test_when_no_fileno
(
self
):
"""
Tests for the fileno method catching the missing pyserial implementeation on the Windows platform
"""
try
:
fileno
=
self
.
bus
.
fileno
()
except
NotImplementedError
:
pass
# allow it to be left non-implemented for Windows platform
else
:
fileno
.
__gt__
=
(
lambda
self
,
compare
:
True
)
# Current platform implements fileno, so get the mock to respond to a greater than comparison
self
.
assertIsNotNone
(
fileno
)
self
.
assertFalse
(
fileno
==
-
1
)
# forcing the value to -1 is the old way of managing fileno on Windows but it is not compatible with notifiers
self
.
assertTrue
(
fileno
>
0
)
class
SimpleSerialTest
(
unittest
.
TestCase
,
SimpleSerialTestBase
):
def
__init__
(
self
,
*
args
,
**
kwargs
):
unittest
.
TestCase
.
__init__
(
self
,
*
args
,
**
kwargs
)
SimpleSerialTestBase
.
__init__
(
self
)
def
setUp
(
self
):
self
.
patcher
=
patch
(
"serial.Serial"
)
self
.
mock_serial
=
self
.
patcher
.
start
()
self
.
serial_dummy
=
SerialDummy
()
self
.
mock_serial
.
return_value
.
write
=
self
.
serial_dummy
.
write
self
.
mock_serial
.
return_value
.
read
=
self
.
serial_dummy
.
read
self
.
addCleanup
(
self
.
patcher
.
stop
)
self
.
bus
=
SerialBus
(
"bus"
,
timeout
=
TIMEOUT
)
def
tearDown
(
self
):
self
.
serial_dummy
.
reset
()
class
SimpleSerialLoopTest
(
unittest
.
TestCase
,
SimpleSerialTestBase
):
def
__init__
(
self
,
*
args
,
**
kwargs
):
unittest
.
TestCase
.
__init__
(
self
,
*
args
,
**
kwargs
)
SimpleSerialTestBase
.
__init__
(
self
)
def
setUp
(
self
):
self
.
bus
=
SerialBus
(
"loop://"
,
timeout
=
TIMEOUT
)
def
tearDown
(
self
):
self
.
bus
.
shutdown
()
if
__name__
==
"__main__"
:
unittest
.
main
()
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