class IntegrityStructure(Structure):
a = fields.Integer(size=2)
b = fields.Integer(size=1)
c = fields.Integer(size=1)
d = fields.Integer(size=2)
e = fields.Integer(size=4)
checksum = fields.CheckSum(size=2)
def test_signed(self):
field = fields.Integer(size=1, signed=True)
self.assertEqual(field.encode(127), b'\x7f')
self.assertEqual(field.encode(-127), b'\x81')
# Values higher than 127 can't be encoded
with self.assertRaises(ValueError):
field.encode(128)
def test_unsigned(self):
field = fields.Integer(size=1, signed=False)
self.assertEqual(field.encode(127), b'\x7f')
self.assertEqual(field.encode(128), b'\x80')
# Negative values can't be encoded
with self.assertRaises(ValueError):
field.encode(-127)
# Values higher than 255 can't be encoded
with self.assertRaises(ValueError):
field.encode(256)
class ReservedStructure(Structure):
a = fields.Integer(size=1)
fields.Reserved(size=1)
b = fields.Integer(size=1)
def setUp(self):
self.field = fields.List(fields.Integer(size=1), size=4)
def setUp(self):
self.field = fields.Integer(size=1)