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test_cansignal.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
test_cansignal
----------------------------------
Tests for `cansignal` module.
"""
import sys
import unittest
assert sys.version_info >= (3, 3, 0), "Python version 3.3 or later required!"
from can4python import constants
from can4python import exceptions
from can4python import cansignal
class TestCanSignal(unittest.TestCase):
def setUp(self):
self.signal = cansignal.CanSignalDefinition('testsignal', 56, 1) # Least significant bit in last byte
def testConstructor(self):
sig = cansignal.CanSignalDefinition('testsignal', 56, 1) # Least significant bit in last byte
self.assertEqual(sig.signalname, 'testsignal')
self.assertEqual(sig.startbit, 56)
self.assertEqual(sig.numberofbits, 1)
self.assertEqual(sig.scalingfactor, 1)
self.assertEqual(sig.valueoffset, 0)
self.assertEqual(sig.endianness, 'little')
self.assertEqual(sig.signaltype, 'unsigned')
self.assertEqual(sig.minvalue, None)
self.assertEqual(sig.maxvalue, None)
self.assertEqual(sig.defaultvalue, 0)
sig = cansignal.CanSignalDefinition('testsignal2', 7, 1, endianness='big') # Most significant bit in first byte
self.assertEqual(sig.signalname, 'testsignal2')
self.assertEqual(sig.startbit, 7)
self.assertEqual(sig.numberofbits, 1)
self.assertEqual(sig.scalingfactor, 1)
self.assertEqual(sig.valueoffset, 0)
self.assertEqual(sig.endianness, 'big')
self.assertEqual(sig.signaltype, 'unsigned')
self.assertEqual(sig.minvalue, None)
self.assertEqual(sig.maxvalue, None)
self.assertEqual(sig.defaultvalue, 0)
sig = cansignal.CanSignalDefinition('testsignal3', 56, 1, defaultvalue=1) # Least significant bit in last byte
self.assertEqual(sig.signalname, 'testsignal3')
self.assertEqual(sig.startbit, 56)
self.assertEqual(sig.numberofbits, 1)
self.assertEqual(sig.scalingfactor, 1)
self.assertEqual(sig.valueoffset, 0)
self.assertEqual(sig.endianness, 'little')
self.assertEqual(sig.signaltype, 'unsigned')
self.assertEqual(sig.minvalue, None)
self.assertEqual(sig.maxvalue, None)
self.assertEqual(sig.defaultvalue, 1)
def testConstructorWrongValues(self):
self.assertRaises(exceptions.CanException, cansignal.CanSignalDefinition, 'testsignal', 63, 1, scalingfactor=-1)
self.assertRaises(exceptions.CanException, cansignal.CanSignalDefinition, 'testsignal', 64, 1)
self.assertRaises(exceptions.CanException, cansignal.CanSignalDefinition, 'testsignal', -1, 1)
self.assertRaises(exceptions.CanException, cansignal.CanSignalDefinition, 'testsignal', 56, 0)
self.assertRaises(exceptions.CanException, cansignal.CanSignalDefinition, 'testsignal', 56, 65)
self.assertRaises(exceptions.CanException, cansignal.CanSignalDefinition,
'testsignal', 63, 2, endianness='little') # Owerflows to bitnumber 64
self.assertRaises(exceptions.CanException, cansignal.CanSignalDefinition,
'testsignal', 7, 2, endianness='big') # Owerflows to the left
self.assertRaises(exceptions.CanException, cansignal.CanSignalDefinition, 'testsignal', 20, 5, "ABC")
self.assertRaises(exceptions.CanException, cansignal.CanSignalDefinition, 'testsignal', 20, 5, None)
self.assertRaises(exceptions.CanException, cansignal.CanSignalDefinition, 'testsignal', 20, 5, "1,0")
self.assertRaises(exceptions.CanException, cansignal.CanSignalDefinition, 'testsignal', 20, 5, 1, None)
self.assertRaises(exceptions.CanException, cansignal.CanSignalDefinition, 'testsignal', 20, 5, 1, "ABC")
self.assertRaises(exceptions.CanException, cansignal.CanSignalDefinition, 'testsignal', 20, 5, 1, "1,0")
self.assertRaises(exceptions.CanException, cansignal.CanSignalDefinition,
'testsignal', 56, 1, endianness='A')
self.assertRaises(exceptions.CanException, cansignal.CanSignalDefinition,
'testsignal', 56, 1, endianness=2)
self.assertRaises(exceptions.CanException, cansignal.CanSignalDefinition,
'testsignal', 56, 1, endianness=None)
def testProperties(self):
self.assertEqual(self.signal.signalname, 'testsignal')
self.assertEqual(self.signal.startbit, 56)
self.assertEqual(self.signal.numberofbits, 1)
self.assertEqual(self.signal.scalingfactor, 1)
self.assertEqual(self.signal.valueoffset, 0)
self.assertEqual(self.signal.endianness, constants.LITTLE_ENDIAN)
self.assertEqual(self.signal.signaltype, constants.CAN_SIGNALTYPE_UNSIGNED)
self.assertEqual(self.signal.maxvalue, None)
self.assertEqual(self.signal.minvalue, None)
self.signal.signalname = 'testsignal2'
self.signal.startbit = 55
self.signal.numberofbits = 2
self.signal.scalingfactor = 2
self.signal.valueoffset = 1
self.signal.maxvalue = 4.1
self.signal.minvalue = 3.2
self.signal.defaultvalue = 3.7
self.signal.endianness = constants.BIG_ENDIAN
self.signal.signaltype = constants.CAN_SIGNALTYPE_SIGNED
self.signal.unit = 'm/s'
self.signal.comment = "ABC"
self.assertEqual(self.signal.signalname, 'testsignal2')
self.assertEqual(self.signal.startbit, 55)
self.assertEqual(self.signal.numberofbits, 2)
self.assertEqual(self.signal.scalingfactor, 2)
self.assertEqual(self.signal.valueoffset, 1)
self.assertEqual(self.signal.maxvalue, 4.1)
self.assertEqual(self.signal.minvalue, 3.2)
self.assertEqual(self.signal.defaultvalue, 3.7)
self.assertEqual(self.signal.endianness, constants.BIG_ENDIAN)
self.assertEqual(self.signal.signaltype, constants.CAN_SIGNALTYPE_SIGNED)
self.assertEqual(self.signal.unit, 'm/s')
self.assertEqual(self.signal.comment, "ABC")
def testPropertiesWrongValues(self):
self.assertRaises(exceptions.CanException, setattr, self.signal, 'startbit', -1)
self.assertRaises(exceptions.CanException, setattr, self.signal, 'startbit', 64)
self.assertRaises(exceptions.CanException, setattr, self.signal, 'startbit', None)
self.assertRaises(exceptions.CanException, setattr, self.signal, 'numberofbits', -1)
self.assertRaises(exceptions.CanException, setattr, self.signal, 'numberofbits', 0)
self.assertRaises(exceptions.CanException, setattr, self.signal, 'numberofbits', None)
self.assertRaises(exceptions.CanException, setattr, self.signal, 'endianness', 1)
self.assertRaises(exceptions.CanException, setattr, self.signal, 'endianness', 'ABC')
self.assertRaises(exceptions.CanException, setattr, self.signal, 'endianness', None)
self.assertRaises(exceptions.CanException, setattr, self.signal, 'signaltype', 1)
self.assertRaises(exceptions.CanException, setattr, self.signal, 'signaltype', 'ABC')
self.assertRaises(exceptions.CanException, setattr, self.signal, 'signaltype', None)
self.assertRaises(exceptions.CanException, setattr, self.signal, 'maxvalue', 2)
self.assertRaises(exceptions.CanException, setattr, self.signal, 'maxvalue', -1)
self.assertRaises(exceptions.CanException, setattr, self.signal, 'maxvalue', 'ABC')
self.assertRaises(exceptions.CanException, setattr, self.signal, 'minvalue', -1)
self.assertRaises(exceptions.CanException, setattr, self.signal, 'minvalue', 2)
self.assertRaises(exceptions.CanException, setattr, self.signal, 'minvalue', 'ABC')
self.assertRaises(exceptions.CanException, setattr, self.signal, 'defaultvalue', -1)
self.assertRaises(exceptions.CanException, setattr, self.signal, 'defaultvalue', 2)
self.assertRaises(exceptions.CanException, setattr, self.signal, 'defaultvalue', 'ABC')
self.assertRaises(exceptions.CanException, setattr, self.signal, 'scalingfactor', 'ABC')
self.assertRaises(exceptions.CanException, setattr, self.signal, 'scalingfactor', None)
self.assertRaises(exceptions.CanException, setattr, self.signal, 'valueoffset', 'ABC')
self.assertRaises(exceptions.CanException, setattr, self.signal, 'valueoffset', None)
sig = cansignal.CanSignalDefinition('testsignal', 56, 1, endianness='big')
sig.signaltype = constants.CAN_SIGNALTYPE_SINGLE
self.assertRaises(exceptions.CanException, setattr, sig, 'numberofbits', 31)
sig.signaltype = constants.CAN_SIGNALTYPE_DOUBLE
self.assertRaises(exceptions.CanException, setattr, sig, 'numberofbits', 63)
def testRepr(self):
print('\nOutput from repr():') # Check the output manually
sig = cansignal.CanSignalDefinition('testsignal', 56, 1, comment="ABC")
print(repr(sig))
comment = "ABC" + " " * 100
sig = cansignal.CanSignalDefinition('testsignal', 56, 1, comment=comment, endianness='big')
print(repr(sig))
def testGetDescriptiveAsciiArt(self):
print('\nOutput from get_descriptive_ascii_art():') # Check the output manually
sig = cansignal.CanSignalDefinition('testsignalA', 56, 1)
print(sig.get_descriptive_ascii_art())
sig = cansignal.CanSignalDefinition('testsignalB', 54, 4)
print(sig.get_descriptive_ascii_art())
sig = cansignal.CanSignalDefinition('testsignalC', 54, 2, endianness='big')
print(sig.get_descriptive_ascii_art())
sig = cansignal.CanSignalDefinition('testsignalD', 54, 4, endianness='big')
print(sig.get_descriptive_ascii_art())
def testMaximumPossibleValueGet(self):
sig = cansignal.CanSignalDefinition('testsignal', 56, 3, scalingfactor=2, valueoffset=10)
result = sig.get_maximum_possible_value()
self.assertEqual(result, 24)
def testMinimumPossibleValueGet(self):
sig = cansignal.CanSignalDefinition('testsignal', 56, 3, scalingfactor=2, valueoffset=10)
result = sig.get_minimum_possible_value()
self.assertEqual(result, 10)
def testGetMinimumDlc(self):
sig = cansignal.CanSignalDefinition('testsignal', 56, 3)
result = sig.get_minimum_dlc()
self.assertEqual(result, 8)
sig = cansignal.CanSignalDefinition('testsignal', 2, 3)
result = sig.get_minimum_dlc()
self.assertEqual(result, 1)
if __name__ == '__main__':
print("\n" * 10)
unittest.main()