def test_valid_make(self):
"""Test full packing."""
my_message = Message('my_msg', [
('my_fixed', 'F', 'i', 8),
('not_specified_fixed', 'F', 'i', 8),
('other_fixed', 'F', 'i', 8, 3),
('just_a_num', 'i'),
('a_string', '32s'),
('this_fixed', 'F', 'i', 5),
], Mode.Big)
data = {
'my_fixed': 1.1 + 2.2,
'other_fixed': Decimal('1.1') + Decimal('2.2'),
'not_specified_fixed': Decimal('1.1') + Decimal('2.2'),
'just_a_num': 16,
'a_string': '=====================',
'this_fixed': '1.9375',
}
packed = my_message.pack(data)
unpacked = my_message.unpack(packed)
assert unpacked.a_string == data['a_string']
assert unpacked.just_a_num == data['just_a_num']
assert unpacked.other_fixed == Decimal('3.3')
assert unpacked.my_fixed == Decimal('3.296875')
assert unpacked.not_specified_fixed == Decimal('3.296875')
assert unpacked.this_fixed == Decimal(data['this_fixed'])
def test_pack_big_endian(self):
"""Test pack the test formats."""
test_msg = Message('test', self.teststruct, Mode.Big)
for idx in range(len(self.testvalues)):
with self.subTest(idx): # pylint: disable=no-member
packed_msg = test_msg.pack(**self.testvalues[idx])
self.assertEqual(self.testbytes['big'][idx], packed_msg)
def test_single_element_2(self):
TestStruct = Message('TestStruct', [
('length_in_objects', 'H', 'vardata'),
('vardata', self.VarTest, 'length_in_objects'),
('single_data', self.VarTest),
])
test_data = {
'length': 2,
'vardata': [
{
'x': 1,
'y': 2
},
{
'x': 3,
'y': 4
},
],
'single_data': {
'x': 6,
'y': 11
},
}
made = TestStruct.make(test_data)
assert len(made.vardata) == 2
assert made.single_data.x == 6
assert made.single_data.y == 11
def test_valid_make(self):
"""Test full packing."""
my_message = Message('my_msg', [
('my_fixed', 'F', 'i', 8),
('not_specified_fixed', 'F', 'i', 8),
('other_fixed', 'F', 'i', 8, 3),
('just_a_num', 'i'),
('a_string', '32s'),
('this_fixed', 'F', 'i', 5),
], Mode.Big)
data = {
'my_fixed': 1.1 + 2.2,
'other_fixed': Decimal('1.1') + Decimal('2.2'),
'not_specified_fixed': Decimal('1.1') + Decimal('2.2'),
'just_a_num': 16,
'a_string': '=====================',
'this_fixed': '1.9375',
}
packed = my_message.pack(data)
unpacked = my_message.unpack(packed)
assert unpacked.a_string == data['a_string']
assert unpacked.just_a_num == data['just_a_num']
assert unpacked.other_fixed == Decimal('3.3')
assert unpacked.my_fixed == Decimal('3.296875')
assert unpacked.not_specified_fixed == Decimal('3.296875')
assert unpacked.this_fixed == Decimal(data['this_fixed'])
def test_byte_length_no_data(self):
TestStruct = Message('TestStruct', [
('length_in_objects', 'H', 'vardata'),
('vardata', self.VarTest, 'length_in_objects'),
(b'length_in_bytes', 'H', 'bytesdata'),
('bytesdata', self.VarTest, b'length_in_bytes'),
])
test_data_no_data = {
'length_in_objects': 0,
'vardata': [],
'length_in_bytes': 0,
'bytesdata': [],
}
made = TestStruct.make(test_data_no_data)
assert made.length_in_objects == 0
assert made.vardata == []
assert made.length_in_bytes == 0
assert made.bytesdata == []
packed = TestStruct.pack(test_data_no_data)
assert packed == \
struct.pack('H', 0) + \
struct.pack('H', 0)
def test_pack_big_endian(self):
"""Test pack the test formats."""
test_msg = Message('test', self.teststruct, Mode.Big)
for idx in range(len(self.testvalues)):
with self.subTest(idx): # pylint: disable=no-member
packed_msg = test_msg.pack(**self.testvalues[idx])
self.assertEqual(self.testbytes['big'][idx], packed_msg)
def test_unpacking_of_too_many_bytes(self):
packed_element = \
struct.pack('H', 1) + \
struct.pack('BB', 255, 127) + \
struct.pack('H', 10) + \
struct.pack('BB', 254, 126) + \
struct.pack('BB', 25, 16) + \
struct.pack('BB', 24, 26) + \
struct.pack('BB', 24, 26) + \
struct.pack('BB', 24, 26) + \
struct.pack('BB', 24, 26) + \
struct.pack('BB', 24, 26) + \
struct.pack('BB', 24, 26) + \
struct.pack('BB', 54, 17)
TestStruct = Message('TestStruct', [
('length_in_objects', 'H', 'vardata'),
('vardata', self.VarTest, 'length_in_objects'),
(b'length_in_bytes', 'H', 'bytesdata'),
('bytesdata', self.VarTest, b'length_in_bytes'),
])
with pytest.raises(ValueError):
unpacked = TestStruct.unpack(packed_element)
assert unpacked
def test_unpack_in_the_middle(self):
SomeMessage = Message('SomeMessage', [
('regular', 'B'),
('irregular', 'B'),
('confused', 'B'),
])
TestStruct = Message('TestStruct', [
('regular', 'B'),
('middle_constant', 'II', (0xAB, 0xBA)),
('a_variable_length', 'H', 'msg'),
('msg', SomeMessage, 'a_variable_length')
], Mode.Little)
test_data = {
'regular': 8,
'a_variable_length': 2,
'msg': [
{'regular': 4, 'irregular': 0, 'confused': 6},
{'regular': 5, 'irregular': 2, 'confused': 4},
],
}
made = TestStruct.make(**test_data)
assert made.regular == 8
assert made.middle_constant == (0xAB, 0xBA)
packed = TestStruct.pack(test_data)
assert packed == b'\x08\xab\x00\x00\x00\xba\x00\x00\x00\x02\x00\x04\x00\x06\x05\x02\x04'
unpacked = TestStruct.unpack(packed)
assert unpacked.regular == 8
assert unpacked.middle_constant == (0xAB, 0xBA)
def test_no_error_message(self):
def adder(*args):
return sum(args)
AdderMessage = Message('AdderMessage', [
('item_a', 'H'),
('item_b', 'B'),
('item_c', 'B'),
('item_d', 'B'),
('item_e', 'B'),
# Note, there is no item 'e' in the list of arguments
('function_data', 'I', adder, ['item_a', 'item_b', 'item_c', 'item_d'], False),
])
# Test with incorrect result
test_data_2 = {
'item_a': 2,
'item_b': 5,
'item_c': 7,
'item_d': 4,
'item_e': 6,
'function_data': -1,
}
made = AdderMessage.make(test_data_2)
assert made.function_data == -1
def test_some_data(self):
num_repeats = 3
TestStruct = Message('TestStruct', [
('length', 'H', 'vardata'),
('vardata', self.VarTest, 'length'),
('repeated_data', self.Repeated, num_repeats),
])
test_data = {
'length': 2,
'vardata': [
{'x': 1, 'y': 2},
{'x': 3, 'y': 4},
],
'repeated_data': [
{'x': 7, 'z': 13},
{'x': 2, 'z': 27},
{'x': 6, 'z': 11},
],
}
made = TestStruct.make(test_data)
assert made.length == 2
assert len(made.vardata) == 2
assert len(made.repeated_data) == 3
packed = TestStruct.pack(test_data)
assert packed == struct.pack('H', 2) + \
struct.pack('BB', 1, 2) + \
struct.pack('BB', 3, 4) + \
(struct.pack('B', 7) + struct.pack('H', 13)) + \
(struct.pack('B', 2) + struct.pack('H', 27)) + \
(struct.pack('B', 6) + struct.pack('H', 11))
def test_not_all_fixed_data(self):
num_repeats = 5
TestStruct = Message('TestStruct', [
('length', 'H', 'vardata'),
('vardata', self.VarTest, 'length'),
('repeated_data', self.Repeated, num_repeats),
])
test_data = {
'length': 1,
'vardata': [
{'x': 255, 'y': 127},
],
'repeated_data': [
{'x': 6, 'z': 12},
{'x': 1, 'z': 26},
{'x': 5, 'z': 10},
],
}
made = TestStruct.make(test_data)
assert made.length == 1
assert len(made.vardata) == 1
assert len(made.repeated_data) == 3
packed = TestStruct.pack(test_data)
assert packed == struct.pack('H', 1) + \
struct.pack('BB', 255, 127) + \
(struct.pack('B', 6) + struct.pack('H', 12)) + \
(struct.pack('B', 1) + struct.pack('H', 26)) + \
(struct.pack('B', 5) + struct.pack('H', 10)) + \
(struct.pack('B', 0) + struct.pack('H', 0)) * 2
def test_make_andk_pack(self):
"""Test field formats that are valid ElementString elements."""
TestStruct = Message(
"TestStruct",
[
("a", "c"), # single character
("b", "2c"), # 2 char string
("c", "10s"), # 10 char string (variable)
("d", "9p"), # 9 ( - 1 ) char string (fixed)
("e", "5c"),
],
)
test_data = {"a": "i", "b": "hi", "c": "short", "d": "long", "e": ["l", "i", "s", "t"]}
made = TestStruct.make(test_data)
assert made.a == ["i"]
assert made.b == ["h", "i"]
assert made.c == "short"
assert made.d == "long\x00\x00\x00\x00"
assert made.e == ["l", "i", "s", "t", "\x00"]
packed = TestStruct.pack(test_data)
unpacked = TestStruct.unpack(packed)
assert made == unpacked
def test_length_after_item(self):
num_repeats = 3
TestStruct = Message('TestStruct', [
('vardata', self.VarTest, 'length'),
('length', 'H', 'vardata'),
('repeated_data', self.Repeated, num_repeats),
])
test_data = {
'length': 2,
'vardata': [
{'x': 1, 'y': 2},
{'x': 3, 'y': 4},
],
'repeated_data': [
{'x': 7, 'z': 13},
{'x': 2, 'z': 27},
{'x': 6, 'z': 11},
],
}
made = TestStruct.make(test_data)
assert made.length == 2
assert made.vardata[0].x == 1
assert made.vardata[0].y == 2
packed = TestStruct.pack(test_data)
unpacked = TestStruct.unpack(packed)
assert unpacked
def test_unpacking_of_too_many_bytes(self):
packed_element = \
struct.pack('H', 1) + \
struct.pack('BB', 255, 127) + \
struct.pack('H', 10) + \
struct.pack('BB', 254, 126) + \
struct.pack('BB', 25, 16) + \
struct.pack('BB', 24, 26) + \
struct.pack('BB', 24, 26) + \
struct.pack('BB', 24, 26) + \
struct.pack('BB', 24, 26) + \
struct.pack('BB', 24, 26) + \
struct.pack('BB', 24, 26) + \
struct.pack('BB', 54, 17)
TestStruct = Message('TestStruct', [
('length_in_objects', 'H', 'vardata'),
('vardata', self.VarTest, 'length_in_objects'),
(b'length_in_bytes', 'H', 'bytesdata'),
('bytesdata', self.VarTest, b'length_in_bytes'),
])
with pytest.raises(ValueError):
unpacked = TestStruct.unpack(packed_element)
assert unpacked
def test_byte_length_more_data(self):
TestStruct = Message('TestStruct', [
('length_in_objects', 'H', 'vardata'),
('vardata', self.VarTest, 'length_in_objects'),
(b'length_in_bytes', 'H', 'bytesdata'),
('bytesdata', self.VarTest, b'length_in_bytes'),
])
test_data_no_data = {
'length_in_objects': 1,
'vardata': [
{'x': 255, 'y': 127},
],
'length_in_bytes': 10,
'bytesdata': [
{'x': 254, 'y': 126},
{'x': 25, 'y': 16},
{'x': 24, 'y': 26},
{'x': 54, 'y': 17},
{'x': 25, 'y': 12},
],
}
made = TestStruct.make(test_data_no_data)
assert made.length_in_objects == 1
assert made.vardata == [
self.VarTest.make(
{'x': 255, 'y': 127}
)]
assert made.length_in_bytes == 10
assert made.bytesdata == [
self.VarTest.make(
{'x': 254, 'y': 126}
),
self.VarTest.make(
{'x': 25, 'y': 16},
),
self.VarTest.make(
{'x': 24, 'y': 26},
),
self.VarTest.make(
{'x': 54, 'y': 17},
),
self.VarTest.make(
{'x': 25, 'y': 12},
),
]
packed = TestStruct.pack(test_data_no_data)
assert packed == \
struct.pack('H', 1) + \
struct.pack('BB', 255, 127) + \
struct.pack('H', 10) + \
struct.pack('BB', 254, 126) + \
struct.pack('BB', 25, 16) + \
struct.pack('BB', 24, 26) + \
struct.pack('BB', 54, 17) + \
struct.pack('BB', 25, 12)
def test_bad_values(self):
"""Test field formats that are valid ElementString elements."""
TestStruct = Message("TestStruct", [("a", "c"), ("b", "2c")]) # single character # 2 char string
test_data = {"a": [5], "b": "no"}
with pytest.raises(TypeError):
TestStruct.make(test_data)
def test_alignment(self):
"""Test field formats that are valid ElementString elements."""
TestStruct = Message("TestStruct", [("a", "c"), ("b", "2c")]) # single character # 2 char string
test_data = {"a": "a", "b": "no"}
TestStruct.update(alignment=4)
packed = TestStruct.pack(test_data)
assert packed == b"a\x00\x00\x00no\x00\x00"
def test_unpack_big_endian(self):
"""Test unpack the test formats."""
test_msg = Message('test', self.teststruct, Mode.Big)
for idx in range(len(self.testvalues)):
with self.subTest(idx): # pylint: disable=no-member
(unpacked_partial_msg, unused) = test_msg.unpack_partial(self.testbytes['big'][idx] + b'\xde\xad')
self.assertEqual(unused, b'\xde\xad')
unpacked_msg = test_msg.unpack(self.testbytes['big'][idx])
expected_tuple = test_msg.make(**self.testvalues[idx]) # pylint: disable=protected-access
self.assertEqual(unpacked_msg, unpacked_partial_msg)
self.assertEqual(unpacked_msg, expected_tuple)
def test_self_pack(self):
my_message = Message('MyMessage', self.teststruct)
my_instance_1 = my_message.make(self.testvalues[0])
my_instance_2 = my_message.make(self.testvalues[1])
my_bytes_1 = my_message.pack(self.testvalues[0])
my_bytes_2 = my_message.pack(self.testvalues[1])
assert my_instance_1.pack() == my_bytes_1
assert my_instance_2.pack() == my_bytes_2
def test_unpack_little_endian(self):
"""Test unpack the test formats."""
test_msg = Message('test', self.teststruct, Mode.Little)
assert test_msg.mode.to_byteorder() == 'little'
for idx in range(len(self.testvalues)):
with self.subTest(idx): # pylint: disable=no-member
(unpacked_partial_msg, unused) = test_msg.unpack_partial(self.testbytes['little'][idx] + b'\xde\xad')
self.assertEqual(unused, b'\xde\xad')
unpacked_msg = test_msg.unpack(self.testbytes['little'][idx])
expected_tuple = test_msg.make(**self.testvalues[idx]) # pylint: disable=protected-access
self.assertEqual(unpacked_msg, unpacked_partial_msg)
self.assertEqual(unpacked_msg, expected_tuple)
def test_some_data(self):
num_repeats = 3
TestStruct = Message('TestStruct', [
('length', 'H', 'vardata'),
('vardata', self.VarTest, 'length'),
('repeated_data', self.Repeated, num_repeats),
])
test_data = {
'length':
2,
'vardata': [
{
'x': 1,
'y': 2
},
{
'x': 3,
'y': 4
},
],
'repeated_data': [
{
'x': 7,
'z': 13
},
{
'x': 2,
'z': 27
},
{
'x': 6,
'z': 11
},
],
}
made = TestStruct.make(test_data)
assert made.length == 2
assert len(made.vardata) == 2
assert len(made.repeated_data) == 3
packed = TestStruct.pack(test_data)
assert packed == struct.pack('H', 2) + \
struct.pack('BB', 1, 2) + \
struct.pack('BB', 3, 4) + \
(struct.pack('B', 7) + struct.pack('H', 13)) + \
(struct.pack('B', 2) + struct.pack('H', 27)) + \
(struct.pack('B', 6) + struct.pack('H', 11))
def test_self_pack(self):
my_message = Message('MyMessage', self.teststruct)
my_instance_1 = my_message.make(self.testvalues[0])
my_instance_2 = my_message.make(self.testvalues[1])
my_bytes_1 = my_message.pack(self.testvalues[0])
my_bytes_2 = my_message.pack(self.testvalues[1])
assert my_instance_1.pack() == my_bytes_1
assert my_instance_2.pack() == my_bytes_2
assert my_message._name == 'MyMessage'
assert my_instance_1._name == 'MyMessage'
def test_one_element(self):
TestStruct = Message('TestStruct', [
('regular', 'B'), # Two regular messages
('fill_in_later', 'H'),
('ending_sequence', 'II', (0xAA, 0xBB)), # An ending sequence to a message
])
test_data = {
'regular': 13,
'fill_in_later': 4,
}
made = TestStruct.make(**test_data)
assert made.regular == 13
assert made.fill_in_later == 4
assert made.ending_sequence == (0xAA, 0xBB)
def test_not_all_fixed_data(self):
num_repeats = 5
TestStruct = Message('TestStruct', [
('length', 'H', 'vardata'),
('vardata', self.VarTest, 'length'),
('repeated_data', self.Repeated, num_repeats),
])
test_data = {
'length':
1,
'vardata': [
{
'x': 255,
'y': 127
},
],
'repeated_data': [
{
'x': 6,
'z': 12
},
{
'x': 1,
'z': 26
},
{
'x': 5,
'z': 10
},
],
}
made = TestStruct.make(test_data)
assert made.length == 1
assert len(made.vardata) == 1
assert len(made.repeated_data) == 3
packed = TestStruct.pack(test_data)
assert packed == struct.pack('H', 1) + \
struct.pack('BB', 255, 127) + \
(struct.pack('B', 6) + struct.pack('H', 12)) + \
(struct.pack('B', 1) + struct.pack('H', 26)) + \
(struct.pack('B', 5) + struct.pack('H', 10)) + \
(struct.pack('B', 0) + struct.pack('H', 0)) * 2
def test_init_invalid_mode(self):
"""Test invalid Message modes."""
for mode in ['=', 'stuff', 0, -1, 1]:
with self.subTest(mode): # pylint: disable=no-member
with self.assertRaises(TypeError) as cm:
Message('test', self.teststruct, mode)
self.assertEqual(str(cm.exception), 'invalid mode: {}'.format(mode))
def test_init_invalid_name(self):
"""Test invalid Message names."""
for name in [None, '', 1, dict(), list()]:
with self.subTest(name): # pylint: disable=no-member
with self.assertRaises(TypeError) as cm:
Message(name, self.teststruct)
self.assertEqual(str(cm.exception), 'invalid name: {}'.format(name))
def test_variable_length(self):
dont_know_how_to_test = Message('DontKnow', [
('numNames', 'B', 'names'),
('names', MyNamed, 'numNames'),
])
# Not sure how to test this one yet
# could do some multiples thing or just let it be.
print(len(dont_know_how_to_test))
def test_one_element(self):
TestStruct = Message(
'TestStruct',
[
('regular', 'B'), # Two regular messages
('fill_in_later', 'H'),
('ending_sequence', 'II',
(0xAA, 0xBB)), # An ending sequence to a message
])
test_data = {
'regular': 13,
'fill_in_later': 4,
}
made = TestStruct.make(**test_data)
assert made.regular == 13
assert made.fill_in_later == 4
assert made.ending_sequence == (0xAA, 0xBB)
def test_unpack(self):
TestStruct = Message('TestStruct', [
('regular', 'B'), # Two regular messages
('fill_in_later', 'H'),
('ending_sequence', 'II', (0xAB, 0xBA)), # An ending sequence to a message
], Mode.Little)
test_data = {
'regular': 8,
'fill_in_later': 7,
}
test_bytes = b'\x08\x07\x00\xab\x00\x00\x00\xba\x00\x00\x00'
assert test_bytes == TestStruct.pack(**test_data)
unpacked = TestStruct.unpack(test_bytes)
assert unpacked.regular == 8
assert unpacked.fill_in_later == 7
assert unpacked.ending_sequence == (0xAB, 0xBA)
def test_adding_element(self):
def adder(x, y):
return x + y
AdderMessage = Message('AdderMessage', [
('item_a', 'H'),
('item_b', 'B'),
('function_data', 'I', adder, ['item_a', 'item_b']),
])
test_data = {
'item_a': 2,
'item_b': 5,
}
made = AdderMessage.make(test_data)
assert made.item_a == 2
assert made.item_b == 5
assert made.function_data == 7
def test_single_element_2(self):
TestStruct = Message('TestStruct', [
('length_in_objects', 'H', 'vardata'),
('vardata', self.VarTest, 'length_in_objects'),
('single_data', self.VarTest),
])
test_data = {
'length': 2,
'vardata': [
{'x': 1, 'y': 2},
{'x': 3, 'y': 4},
],
'single_data': {'x': 6, 'y': 11},
}
made = TestStruct.make(test_data)
assert len(made.vardata) == 2
assert made.single_data.x == 6
assert made.single_data.y == 11
def test_bad_length_item(self):
bad_message = Message('BadMessage', [
('type', 'B', MyEnum),
('data', {
MyEnum.THIS: MyNamed,
MyEnum.THAT: NotSameMessage,
MyEnum.OTHER: MyOtherNamed,
}, 'type'),
])
with self.assertRaises(AttributeError):
print(len(bad_message))
def test_unpacking_of_too_little_bytes(self):
# Only pack four elements, instead of the five
packed_element = \
struct.pack('H', 1) + \
struct.pack('BB', 255, 127) + \
struct.pack('H', 10) + \
struct.pack('BB', 254, 126) + \
struct.pack('BB', 25, 16) + \
struct.pack('BB', 24, 26) + \
struct.pack('BB', 54, 17)
TestStruct = Message('TestStruct', [
('length_in_objects', 'H', 'vardata'),
('vardata', self.VarTest, 'length_in_objects'),
(b'length_in_bytes', 'H', 'bytesdata'),
('bytesdata', self.VarTest, b'length_in_bytes'),
])
with pytest.raises(struct.error):
unpacked = TestStruct.unpack(packed_element)
assert unpacked
def test_unpacking_of_too_little_bytes(self):
# Only pack four elements, instead of the five
packed_element = \
struct.pack('H', 1) + \
struct.pack('BB', 255, 127) + \
struct.pack('H', 10) + \
struct.pack('BB', 254, 126) + \
struct.pack('BB', 25, 16) + \
struct.pack('BB', 24, 26) + \
struct.pack('BB', 54, 17)
TestStruct = Message('TestStruct', [
('length_in_objects', 'H', 'vardata'),
('vardata', self.VarTest, 'length_in_objects'),
(b'length_in_bytes', 'H', 'bytesdata'),
('bytesdata', self.VarTest, b'length_in_bytes'),
])
with pytest.raises(struct.error):
unpacked = TestStruct.unpack(packed_element)
assert unpacked
def test_one_element(self):
def crc32_wrapper(*args):
return crc32(b''.join(args))
CompareMessage = Message('CompareMessage', [
('length_in_objects', 'H', 'vardata'),
('vardata', self.VarTest, 'length_in_objects'),
])
CRCedMessage = Message('TestStruct', [
('length_in_objects', 'H', 'vardata'),
('vardata', self.VarTest, 'length_in_objects'),
('function_data', 'I', crc32_wrapper, [b'length_in_objects', b'vardata']),
])
test_data = {
'length_in_objects': 2,
'vardata': [
{'x': 1, 'y': 2},
{'x': 3, 'y': 4},
],
}
made = CRCedMessage.make(test_data)
# assert len(made) == 5
assert len(made.vardata) == 2
assert made.vardata[0].x == 1
assert made.vardata[0].y == 2
assert made.function_data == crc32(CompareMessage.pack(test_data))
def test_single_element_2(self):
TestStruct = Message('TestStruct', [
('length_in_objects', 'H', 'vardata'),
('vardata', self.VarTest, 'length_in_objects'),
])
CRCedMessage = Message('CRCedMessage', [
('data', TestStruct),
('function_data', 'I', crc32, [b'data']),
])
test_data = {
'data': {
'length_in_objects': 2,
'vardata': [
{'x': 1, 'y': 2},
{'x': 3, 'y': 4},
],
},
}
made = CRCedMessage.make(test_data)
# assert len(made) == 5
assert len(made.data.vardata) == 2
assert made.data.vardata[0].x == 1
assert made.data.vardata[0].y == 2
assert made.function_data == crc32(TestStruct.pack(test_data['data']))
def test_no_data(self):
num_repeats = 4
TestStruct = Message('TestStruct', [
('length', 'H', 'vardata'),
('vardata', self.VarTest, 'length'),
('repeated_data', self.Repeated, num_repeats),
])
test_data_no_data = {
'length': 0,
'vardata': [],
'repeated_data': [
],
}
made = TestStruct.make(test_data_no_data)
assert made.length == 0
assert made.vardata == []
assert made.repeated_data == []
packed = TestStruct.pack(test_data_no_data)
assert packed == struct.pack('H', 0) + (struct.pack('B', 0) + struct.pack('H', 0)) * num_repeats
def test_bad_names(self):
with pytest.raises(ValueError) as e:
test_msg = Message('test', [
('pack', 'H'),
('_elements', 'H'),
('_fields', 'H'),
])
print(test_msg)
assert 'pack' in str(e)
assert '_elements' in str(e)
assert '_fields' in str(e)
def test_no_data(self):
num_repeats = 4
TestStruct = Message('TestStruct', [
('length', 'H', 'vardata'),
('vardata', self.VarTest, 'length'),
('repeated_data', self.Repeated, num_repeats),
])
test_data_no_data = {
'length': 0,
'vardata': [],
'repeated_data': [],
}
made = TestStruct.make(test_data_no_data)
assert made.length == 0
assert made.vardata == []
assert made.repeated_data == []
packed = TestStruct.pack(test_data_no_data)
assert packed == struct.pack(
'H', 0) + (struct.pack('B', 0) + struct.pack('H', 0)) * num_repeats
def test_unpack(self):
TestStruct = Message(
'TestStruct',
[
('regular', 'B'), # Two regular messages
('fill_in_later', 'H'),
('ending_sequence', 'II',
(0xAB, 0xBA)), # An ending sequence to a message
],
Mode.Little)
test_data = {
'regular': 8,
'fill_in_later': 7,
}
test_bytes = b'\x08\x07\x00\xab\x00\x00\x00\xba\x00\x00\x00'
assert test_bytes == TestStruct.pack(**test_data)
unpacked = TestStruct.unpack(test_bytes)
assert unpacked.regular == 8
assert unpacked.fill_in_later == 7
assert unpacked.ending_sequence == (0xAB, 0xBA)
def test_unpacking_of_correct_size(self):
packed_element = \
struct.pack('H', 1) + \
struct.pack('BB', 255, 127) + \
struct.pack('H', 10) + \
struct.pack('BB', 254, 126) + \
struct.pack('BB', 25, 16) + \
struct.pack('BB', 24, 26) + \
struct.pack('BB', 54, 17) + \
struct.pack('BB', 25, 12)
TestStruct = Message('TestStruct', [
('length_in_objects', 'H', 'vardata'),
('vardata', self.VarTest, 'length_in_objects'),
(b'length_in_bytes', 'H', 'bytesdata'),
('bytesdata', self.VarTest, b'length_in_bytes'),
])
unpacked = TestStruct.unpack(packed_element)
assert unpacked
assert unpacked.length_in_objects == 1
assert unpacked.length_in_bytes == 10
def test_unpacking_of_correct_size(self):
packed_element = \
struct.pack('H', 1) + \
struct.pack('BB', 255, 127) + \
struct.pack('H', 10) + \
struct.pack('BB', 254, 126) + \
struct.pack('BB', 25, 16) + \
struct.pack('BB', 24, 26) + \
struct.pack('BB', 54, 17) + \
struct.pack('BB', 25, 12)
TestStruct = Message('TestStruct', [
('length_in_objects', 'H', 'vardata'),
('vardata', self.VarTest, 'length_in_objects'),
(b'length_in_bytes', 'H', 'bytesdata'),
('bytesdata', self.VarTest, b'length_in_bytes'),
])
unpacked = TestStruct.unpack(packed_element)
assert unpacked
assert unpacked.length_in_objects == 1
assert unpacked.length_in_bytes == 10
def test_byte_length_no_data(self):
TestStruct = Message('TestStruct', [
('length_in_objects', 'H', 'vardata'),
('vardata', self.VarTest, 'length_in_objects'),
(b'length_in_bytes', 'H', 'bytesdata'),
('bytesdata', self.VarTest, b'length_in_bytes'),
])
test_data_no_data = {
'length_in_objects': 0,
'vardata': [],
'length_in_bytes': 0,
'bytesdata': [],
}
made = TestStruct.make(test_data_no_data)
assert made.length_in_objects == 0
assert made.vardata == []
assert made.length_in_bytes == 0
assert made.bytesdata == []
packed = TestStruct.pack(test_data_no_data)
assert packed == \
struct.pack('H', 0) + \
struct.pack('H', 0)
def test_byte_length_some_data(self):
TestStruct = Message('TestStruct', [
('length_in_objects', 'H', 'vardata'),
('vardata', self.VarTest, 'length_in_objects'),
(b'length_in_bytes', 'H', 'bytesdata'),
('bytesdata', self.VarTest, b'length_in_bytes'),
])
test_data_no_data = {
'length_in_objects': 1,
'vardata': [
{
'x': 255,
'y': 127
},
],
'length_in_bytes': 2,
'bytesdata': [
{
'x': 254,
'y': 126
},
],
}
made = TestStruct.make(test_data_no_data)
assert made.length_in_objects == 1
assert made.vardata == [self.VarTest.make({'x': 255, 'y': 127})]
assert made.length_in_bytes == 2
assert made.bytesdata == [self.VarTest.make({'x': 254, 'y': 126})]
packed = TestStruct.pack(test_data_no_data)
assert packed == \
struct.pack('H', 1) + \
struct.pack('BB', 255, 127) + \
struct.pack('H', 2) + \
struct.pack('BB', 254, 126)
def test_long_item(self):
long_message = Message('ThisIsALongOne', [
('ID', 'B'),
('delay', 'B'),
('a_byte', 'B'),
('type', 'B', MyEnum),
('data', {
MyEnum.THIS: MyNamed,
MyEnum.THAT: MyNamed,
MyEnum.OTHER: MyOtherNamed,
}, 'type'),
])
# Second size is from the MyNamed Enum above
my_named_format = 'B32s'
assert len(long_message) == struct.calcsize('BBBB' + my_named_format)
def test_unpack_in_the_middle(self):
SomeMessage = Message('SomeMessage', [
('regular', 'B'),
('irregular', 'B'),
('confused', 'B'),
])
TestStruct = Message('TestStruct',
[('regular', 'B'),
('middle_constant', 'II', (0xAB, 0xBA)),
('a_variable_length', 'H', 'msg'),
('msg', SomeMessage, 'a_variable_length')],
Mode.Little)
test_data = {
'regular':
8,
'a_variable_length':
2,
'msg': [
{
'regular': 4,
'irregular': 0,
'confused': 6
},
{
'regular': 5,
'irregular': 2,
'confused': 4
},
],
}
made = TestStruct.make(**test_data)
assert made.regular == 8
assert made.middle_constant == (0xAB, 0xBA)
packed = TestStruct.pack(test_data)
assert packed == b'\x08\xab\x00\x00\x00\xba\x00\x00\x00\x02\x00\x04\x00\x06\x05\x02\x04'
unpacked = TestStruct.unpack(packed)
assert unpacked.regular == 8
assert unpacked.middle_constant == (0xAB, 0xBA)
class TestStarStruct(unittest.TestCase):
"""Test class for self packing of messages"""
teststruct = [
('a', 'b'), # signed byte: -128, 127
('pad1', '3x'), # 3 pad bytes
('b', 'H'), # unsigned short: 0, 65535
('pad2', 'x'), # 1 pad byte
]
testvalues = [
{
'a': -128,
'b': 0,
},
{
'a': 127,
'b': 65535,
},
]
VarTest = Message('VarTest', [
('x', 'B'),
('y', 'B'),
])
Repeated = Message('Repeated', [
('x', 'B'),
('z', 'H'),
])
def test_self_pack(self):
my_message = Message('MyMessage', self.teststruct)
my_instance_1 = my_message.make(self.testvalues[0])
my_instance_2 = my_message.make(self.testvalues[1])
my_bytes_1 = my_message.pack(self.testvalues[0])
my_bytes_2 = my_message.pack(self.testvalues[1])
assert my_instance_1.pack() == my_bytes_1
assert my_instance_2.pack() == my_bytes_2
def test_no_data(self):
num_repeats = 4
TestStruct = Message('TestStruct', [
('length', 'H', 'vardata'),
('vardata', self.VarTest, 'length'),
('repeated_data', self.Repeated, num_repeats),
])
test_data_no_data = {
'length': 0,
'vardata': [],
'repeated_data': [
],
}
made = TestStruct.make(test_data_no_data)
assert made.length == 0
assert made.vardata == []
assert made.repeated_data == []
packed = TestStruct.pack(test_data_no_data)
assert packed == struct.pack('H', 0) + (struct.pack('B', 0) + struct.pack('H', 0)) * num_repeats
assert packed == made.pack()
def test_adding_element_list(self):
def adder(*args):
return sum(args)
AdderMessage = Message('AdderMessage', [
('item_a', 'H'),
('item_b', 'B'),
('item_c', 'B'),
('item_d', 'B'),
('item_e', 'B'),
# Note, there is no item 'e' in the list of arguments
('function_data', 'I', adder, ['item_a', 'item_b', 'item_c', 'item_d']),
])
# Test getting the correct result
test_data = {
'item_a': 2,
'item_b': 5,
'item_c': 7,
'item_d': 4,
'item_e': 6,
}
made = AdderMessage.make(test_data)
assert made.item_a == 2
assert made.item_b == 5
assert made.function_data == 2 + 5 + 7 + 4
# Check packing and unpacking
packed = AdderMessage.pack(test_data)
assert packed == b'\x02\x00\x05\x07\x04\x06\x12\x00\x00\x00'
assert packed == made.pack()
unpacked = AdderMessage.unpack(packed)
assert made == unpacked
# Test with correct result
test_data_2 = {
'item_a': 2,
'item_b': 5,
'item_c': 7,
'item_d': 4,
'item_e': 6,
'function_data': 2 + 5 + 7 + 4,
}
made = AdderMessage.make(test_data_2)
assert made.item_a == 2
assert made.item_b == 5
assert made.function_data == 2 + 5 + 7 + 4
# Test with incorrect result
test_data_2 = {
'item_a': 2,
'item_b': 5,
'item_c': 7,
'item_d': 4,
'item_e': 6,
'function_data': -1,
}
with pytest.raises(ValueError):
made = AdderMessage.make(test_data_2)
def test_verifying_unpack(self):
def adder(*args):
return sum(args)
AdderMessage = Message('AdderMessage', [
('item_a', 'H'),
('item_b', 'B'),
('item_c', 'B'),
('item_d', 'B'),
('item_e', 'B'),
# Note, there is no item 'e' in the list of arguments
('function_data', 'I', adder, ['item_a', 'item_b', 'item_c', 'item_d']),
])
# Test getting the correct result
test_data = {
'item_a': 2,
'item_b': 5,
'item_c': 7,
'item_d': 4,
'item_e': 6,
}
made = AdderMessage.make(test_data)
assert made.item_a == 2
assert made.item_b == 5
assert made.function_data == 2 + 5 + 7 + 4
# Check packing and unpacking
packed = AdderMessage.pack(test_data)
assert packed == b'\x02\x00\x05\x07\x04\x06\x12\x00\x00\x00'
assert packed == made.pack()
unpacked = AdderMessage.unpack(packed)
assert made == unpacked
# Now we modify the data we are going to unpack, and we should get an error
modified_packed = b'\x02\x00\x05\x07\x04\x06\x11\x11\x11\x11'
with pytest.raises(ValueError):
unpacked = AdderMessage.unpack(modified_packed)
AdderMessageFalse = Message('AdderMessageFalse', [
('item_a', 'H'),
('item_b', 'B'),
('item_c', 'B'),
('item_d', 'B'),
('item_e', 'B'),
# Note, there is no item 'e' in the list of arguments
('function_data', 'I', adder, ['item_a', 'item_b', 'item_c', 'item_d'], False),
])
# Test getting the correct result
test_data = {
'item_a': 2,
'item_b': 5,
'item_c': 7,
'item_d': 4,
'item_e': 6,
}
made = AdderMessageFalse.make(test_data)
assert made.item_a == 2
assert made.item_b == 5
assert made.function_data == 2 + 5 + 7 + 4
# Check packing and unpacking
packed = AdderMessageFalse.pack(test_data)
assert packed == b'\x02\x00\x05\x07\x04\x06\x12\x00\x00\x00'
assert packed == made.pack()
unpacked = AdderMessageFalse.unpack(packed)
assert made == unpacked
# Now we modify the data we are going to unpack, and we should get an error
modified_packed = b'\x02\x00\x05\x07\x04\x06\x11\x11\x11\x11'
# This time it won't fail because we set False for this message
unpacked = AdderMessageFalse.unpack(modified_packed)
assert unpacked.item_a == 2
class TestStarStruct(unittest.TestCase):
"""StarStruct module tests"""
teststruct = [
('a', 'b'), # signed byte: -128, 127
('pad1', '3x'), # 3 pad bytes
('b', 'H'), # unsigned short: 0, 65535
('pad2', 'x'), # 1 pad byte
('c', '10s'), # 10 byte string
('d', 'x'), # 1 pad byte
('e', '2H'), # 4 unsigned bytes: 0, 2^32-1
('type', 'B', SimpleEnum), # unsigned byte, enum validated
('length', 'H', 'vardata'), # unsigned short length field
('vardata', # variable length data
Message('VarTest', [('x', 'B'), ('y', 'B')]),
'length'),
('data', { # discriminated data
SimpleEnum.one: Message('Struct1', [('y', 'B'), ('pad', '3x'), ('z', 'i')]),
SimpleEnum.two: Message('Struct2', [('z', '20s')]),
SimpleEnum.three: Message('Struct3', []),
}, 'type'),
]
testvalues = [
{
'a': -128,
'b': 0,
'c': '0123456789',
'e': 0,
'type': SimpleEnum.one,
'length': 0,
'vardata': [],
'data': {
'y': 50,
'z': 0x5577AACC,
},
},
{
'a': 127,
'b': 65535,
'c': 'abcdefghij',
'e': 0xFFFFFFFF,
'type': SimpleEnum.two,
'length': 2,
'vardata': [
{
'x': 1,
'y': 2
},
{
'x': 3,
'y': 4
},
],
'data': {
'z': '0123456789abcdefghij',
},
},
{
'a': -1,
'b': 32767,
'c': '\n\tzyx',
'e': 0x7FFFFFFF,
'type': SimpleEnum.three,
'length': 1,
'vardata': [
{
'x': 255,
'y': 127
},
],
'data': {},
},
{
'a':
100,
'b':
100,
'c':
'a0b1c2d3e4',
'e':
10000,
'type':
SimpleEnum.one,
'length':
10,
'vardata': [
{
'x': 255,
'y': 127
},
{
'x': 254,
'y': 128
},
{
'x': 253,
'y': 129
},
{
'x': 252,
'y': 130
},
{
'x': 251,
'y': 131
},
{
'x': 250,
'y': 132
},
{
'x': 249,
'y': 133
},
{
'x': 248,
'y': 134
},
{
'x': 247,
'y': 135
},
{
'x': 246,
'y': 136
},
],
'data': {
'y': 100,
'z': 2000,
},
},
]
testbytes = {
'little': [
b'\x80\x00\x00\x00\x00\x00\x00\x30\x31\x32\x33\x34\x35\x36\x37\x38\x39\x00\x00\x00\x00\x00\x01\x00\x00\x32\x00\x00\x00\xCC\xAA\x77\x55',
b'\x7F\x00\x00\x00\xFF\xFF\x00\x61\x62\x63\x64\x65\x66\x67\x68\x69\x6A\x00\xFF\xFF\xFF\xFF\x02\x02\x00\x01\x02\x03\x04\x30\x31\x32\x33\x34\x35\x36\x37\x38\x39\x61\x62\x63\x64\x65\x66\x67\x68\x69\x6a',
b'\xFF\x00\x00\x00\xFF\x7F\x00\x0A\x09\x7A\x79\x78\x00\x00\x00\x00\x00\x00\xFF\xFF\xFF\x7F\x03\x01\x00\xFF\x7F',
b'\x64\x00\x00\x00\x64\x00\x00\x61\x30\x62\x31\x63\x32\x64\x33\x65\x34\x00\x10\x27\x00\x00\x01\x0A\x00\xFF\x7F\xFE\x80\xFD\x81\xFC\x82\xFB\x83\xFA\x84\xF9\x85\xF8\x86\xF7\x87\xF6\x88\x64\x00\x00\x00\xD0\x07\x00\x00',
],
'big': [
b'\x80\x00\x00\x00\x00\x00\x00\x30\x31\x32\x33\x34\x35\x36\x37\x38\x39\x00\x00\x00\x00\x00\x01\x00\x00\x32\x00\x00\x00\x55\x77\xAA\xCC',
b'\x7F\x00\x00\x00\xFF\xFF\x00\x61\x62\x63\x64\x65\x66\x67\x68\x69\x6A\x00\xFF\xFF\xFF\xFF\x02\x00\x02\x01\x02\x03\x04\x30\x31\x32\x33\x34\x35\x36\x37\x38\x39\x61\x62\x63\x64\x65\x66\x67\x68\x69\x6a',
b'\xFF\x00\x00\x00\x7F\xFF\x00\x0A\x09\x7A\x79\x78\x00\x00\x00\x00\x00\x00\x7F\xFF\xFF\xFF\x03\x00\x01\xFF\x7F',
b'\x64\x00\x00\x00\x00\x64\x00\x61\x30\x62\x31\x63\x32\x64\x33\x65\x34\x00\x00\x00\x27\x10\x01\x00\x0A\xFF\x7F\xFE\x80\xFD\x81\xFC\x82\xFB\x83\xFA\x84\xF9\x85\xF8\x86\xF7\x87\xF6\x88\x64\x00\x00\x00\x00\x00\x07\xD0',
],
}
def test_init_invalid_name(self):
"""Test invalid Message names."""
for name in [None, '', 1, dict(), list()]:
with self.subTest(name): # pylint: disable=no-member
with self.assertRaises(TypeError) as cm:
Message(name, self.teststruct)
self.assertEqual(str(cm.exception),
'invalid name: {}'.format(name))
def test_init_invalid_mode(self):
"""Test invalid Message modes."""
for mode in ['=', 'stuff', 0, -1, 1]:
with self.subTest(mode): # pylint: disable=no-member
with self.assertRaises(TypeError) as cm:
Message('test', self.teststruct, mode)
self.assertEqual(str(cm.exception),
'invalid mode: {}'.format(mode))
def test_init_empty_struct(self):
"""Test an empty Message."""
val = Message('test', [])
self.assertEqual(val._tuple._fields, ()) # pylint: disable=protected-access
def test_pack_little_endian(self):
"""Test pack the test formats."""
test_msg = Message('test', self.teststruct, Mode.Little)
for idx in range(len(self.testvalues)):
with self.subTest(idx): # pylint: disable=no-member
packed_msg = test_msg.pack(**self.testvalues[idx])
self.assertEqual(self.testbytes['little'][idx], packed_msg)
def test_unpack_little_endian(self):
"""Test unpack the test formats."""
test_msg = Message('test', self.teststruct, Mode.Little)
for idx in range(len(self.testvalues)):
with self.subTest(idx): # pylint: disable=no-member
(unpacked_partial_msg, unused
) = test_msg.unpack_partial(self.testbytes['little'][idx] +
b'\xde\xad')
self.assertEqual(unused, b'\xde\xad')
unpacked_msg = test_msg.unpack(self.testbytes['little'][idx])
expected_tuple = test_msg.make(**self.testvalues[idx]) # pylint: disable=protected-access
self.assertEqual(unpacked_msg, unpacked_partial_msg)
self.assertEqual(unpacked_msg, expected_tuple)
def test_pack_big_endian(self):
"""Test pack the test formats."""
test_msg = Message('test', self.teststruct, Mode.Big)
for idx in range(len(self.testvalues)):
with self.subTest(idx): # pylint: disable=no-member
packed_msg = test_msg.pack(**self.testvalues[idx])
self.assertEqual(self.testbytes['big'][idx], packed_msg)
def test_unpack_big_endian(self):
"""Test unpack the test formats."""
test_msg = Message('test', self.teststruct, Mode.Big)
for idx in range(len(self.testvalues)):
with self.subTest(idx): # pylint: disable=no-member
(unpacked_partial_msg,
unused) = test_msg.unpack_partial(self.testbytes['big'][idx] +
b'\xde\xad')
self.assertEqual(unused, b'\xde\xad')
unpacked_msg = test_msg.unpack(self.testbytes['big'][idx])
expected_tuple = test_msg.make(**self.testvalues[idx]) # pylint: disable=protected-access
self.assertEqual(unpacked_msg, unpacked_partial_msg)
self.assertEqual(unpacked_msg, expected_tuple)
def test_init_empty_struct(self):
"""Test an empty Message."""
val = Message('test', [])
self.assertEqual(val._tuple._fields, ()) # pylint: disable=protected-access
class TestStarStruct(unittest.TestCase):
"""StarStruct module tests"""
VarTest = Message('VarTest', [
('x', 'B'),
('y', 'B'),
])
Repeated = Message('Repeated', [
('x', 'B'),
('z', 'H'),
])
def test_no_data(self):
num_repeats = 4
TestStruct = Message('TestStruct', [
('length', 'H', 'vardata'),
('vardata', self.VarTest, 'length'),
('repeated_data', self.Repeated, num_repeats),
])
test_data_no_data = {
'length': 0,
'vardata': [],
'repeated_data': [],
}
made = TestStruct.make(test_data_no_data)
assert made.length == 0
assert made.vardata == []
assert made.repeated_data == []
packed = TestStruct.pack(test_data_no_data)
assert packed == struct.pack(
'H', 0) + (struct.pack('B', 0) + struct.pack('H', 0)) * num_repeats
def test_some_data(self):
num_repeats = 3
TestStruct = Message('TestStruct', [
('length', 'H', 'vardata'),
('vardata', self.VarTest, 'length'),
('repeated_data', self.Repeated, num_repeats),
])
test_data = {
'length':
2,
'vardata': [
{
'x': 1,
'y': 2
},
{
'x': 3,
'y': 4
},
],
'repeated_data': [
{
'x': 7,
'z': 13
},
{
'x': 2,
'z': 27
},
{
'x': 6,
'z': 11
},
],
}
made = TestStruct.make(test_data)
assert made.length == 2
assert len(made.vardata) == 2
assert len(made.repeated_data) == 3
packed = TestStruct.pack(test_data)
assert packed == struct.pack('H', 2) + \
struct.pack('BB', 1, 2) + \
struct.pack('BB', 3, 4) + \
(struct.pack('B', 7) + struct.pack('H', 13)) + \
(struct.pack('B', 2) + struct.pack('H', 27)) + \
(struct.pack('B', 6) + struct.pack('H', 11))
def test_not_all_fixed_data(self):
num_repeats = 5
TestStruct = Message('TestStruct', [
('length', 'H', 'vardata'),
('vardata', self.VarTest, 'length'),
('repeated_data', self.Repeated, num_repeats),
])
test_data = {
'length':
1,
'vardata': [
{
'x': 255,
'y': 127
},
],
'repeated_data': [
{
'x': 6,
'z': 12
},
{
'x': 1,
'z': 26
},
{
'x': 5,
'z': 10
},
],
}
made = TestStruct.make(test_data)
assert made.length == 1
assert len(made.vardata) == 1
assert len(made.repeated_data) == 3
packed = TestStruct.pack(test_data)
assert packed == struct.pack('H', 1) + \
struct.pack('BB', 255, 127) + \
(struct.pack('B', 6) + struct.pack('H', 12)) + \
(struct.pack('B', 1) + struct.pack('H', 26)) + \
(struct.pack('B', 5) + struct.pack('H', 10)) + \
(struct.pack('B', 0) + struct.pack('H', 0)) * 2
def test_byte_length_no_data(self):
TestStruct = Message('TestStruct', [
('length_in_objects', 'H', 'vardata'),
('vardata', self.VarTest, 'length_in_objects'),
(b'length_in_bytes', 'H', 'bytesdata'),
('bytesdata', self.VarTest, b'length_in_bytes'),
])
test_data_no_data = {
'length_in_objects': 0,
'vardata': [],
'length_in_bytes': 0,
'bytesdata': [],
}
made = TestStruct.make(test_data_no_data)
assert made.length_in_objects == 0
assert made.vardata == []
assert made.length_in_bytes == 0
assert made.bytesdata == []
packed = TestStruct.pack(test_data_no_data)
assert packed == \
struct.pack('H', 0) + \
struct.pack('H', 0)
def test_byte_length_some_data(self):
TestStruct = Message('TestStruct', [
('length_in_objects', 'H', 'vardata'),
('vardata', self.VarTest, 'length_in_objects'),
(b'length_in_bytes', 'H', 'bytesdata'),
('bytesdata', self.VarTest, b'length_in_bytes'),
])
test_data_no_data = {
'length_in_objects': 1,
'vardata': [
{
'x': 255,
'y': 127
},
],
'length_in_bytes': 2,
'bytesdata': [
{
'x': 254,
'y': 126
},
],
}
made = TestStruct.make(test_data_no_data)
assert made.length_in_objects == 1
assert made.vardata == [self.VarTest.make({'x': 255, 'y': 127})]
assert made.length_in_bytes == 2
assert made.bytesdata == [self.VarTest.make({'x': 254, 'y': 126})]
packed = TestStruct.pack(test_data_no_data)
assert packed == \
struct.pack('H', 1) + \
struct.pack('BB', 255, 127) + \
struct.pack('H', 2) + \
struct.pack('BB', 254, 126)
def test_byte_length_more_data(self):
TestStruct = Message('TestStruct', [
('length_in_objects', 'H', 'vardata'),
('vardata', self.VarTest, 'length_in_objects'),
(b'length_in_bytes', 'H', 'bytesdata'),
('bytesdata', self.VarTest, b'length_in_bytes'),
])
test_data_no_data = {
'length_in_objects':
1,
'vardata': [
{
'x': 255,
'y': 127
},
],
'length_in_bytes':
10,
'bytesdata': [
{
'x': 254,
'y': 126
},
{
'x': 25,
'y': 16
},
{
'x': 24,
'y': 26
},
{
'x': 54,
'y': 17
},
{
'x': 25,
'y': 12
},
],
}
made = TestStruct.make(test_data_no_data)
assert made.length_in_objects == 1
assert made.vardata == [self.VarTest.make({'x': 255, 'y': 127})]
assert made.length_in_bytes == 10
assert made.bytesdata == [
self.VarTest.make({
'x': 254,
'y': 126
}),
self.VarTest.make({
'x': 25,
'y': 16
}, ),
self.VarTest.make({
'x': 24,
'y': 26
}, ),
self.VarTest.make({
'x': 54,
'y': 17
}, ),
self.VarTest.make({
'x': 25,
'y': 12
}, ),
]
packed = TestStruct.pack(test_data_no_data)
assert packed == \
struct.pack('H', 1) + \
struct.pack('BB', 255, 127) + \
struct.pack('H', 10) + \
struct.pack('BB', 254, 126) + \
struct.pack('BB', 25, 16) + \
struct.pack('BB', 24, 26) + \
struct.pack('BB', 54, 17) + \
struct.pack('BB', 25, 12)
def test_unpacking_of_correct_size(self):
packed_element = \
struct.pack('H', 1) + \
struct.pack('BB', 255, 127) + \
struct.pack('H', 10) + \
struct.pack('BB', 254, 126) + \
struct.pack('BB', 25, 16) + \
struct.pack('BB', 24, 26) + \
struct.pack('BB', 54, 17) + \
struct.pack('BB', 25, 12)
TestStruct = Message('TestStruct', [
('length_in_objects', 'H', 'vardata'),
('vardata', self.VarTest, 'length_in_objects'),
(b'length_in_bytes', 'H', 'bytesdata'),
('bytesdata', self.VarTest, b'length_in_bytes'),
])
unpacked = TestStruct.unpack(packed_element)
assert unpacked
assert unpacked.length_in_objects == 1
assert unpacked.length_in_bytes == 10
def test_unpacking_of_too_little_bytes(self):
# Only pack four elements, instead of the five
packed_element = \
struct.pack('H', 1) + \
struct.pack('BB', 255, 127) + \
struct.pack('H', 10) + \
struct.pack('BB', 254, 126) + \
struct.pack('BB', 25, 16) + \
struct.pack('BB', 24, 26) + \
struct.pack('BB', 54, 17)
TestStruct = Message('TestStruct', [
('length_in_objects', 'H', 'vardata'),
('vardata', self.VarTest, 'length_in_objects'),
(b'length_in_bytes', 'H', 'bytesdata'),
('bytesdata', self.VarTest, b'length_in_bytes'),
])
with pytest.raises(struct.error):
unpacked = TestStruct.unpack(packed_element)
assert unpacked
def test_unpacking_of_too_many_bytes(self):
packed_element = \
struct.pack('H', 1) + \
struct.pack('BB', 255, 127) + \
struct.pack('H', 10) + \
struct.pack('BB', 254, 126) + \
struct.pack('BB', 25, 16) + \
struct.pack('BB', 24, 26) + \
struct.pack('BB', 24, 26) + \
struct.pack('BB', 24, 26) + \
struct.pack('BB', 24, 26) + \
struct.pack('BB', 24, 26) + \
struct.pack('BB', 24, 26) + \
struct.pack('BB', 54, 17)
TestStruct = Message('TestStruct', [
('length_in_objects', 'H', 'vardata'),
('vardata', self.VarTest, 'length_in_objects'),
(b'length_in_bytes', 'H', 'bytesdata'),
('bytesdata', self.VarTest, b'length_in_bytes'),
])
with pytest.raises(ValueError):
unpacked = TestStruct.unpack(packed_element)
assert unpacked
def test_single_element(self):
TestStruct = Message('TestStruct', [
('length_in_objects', 'H', 'vardata'),
('vardata', self.VarTest, 'length_in_objects'),
('single_data', self.VarTest),
])
test_data = {
'length': 2,
'vardata': [
{
'x': 1,
'y': 2
},
{
'x': 3,
'y': 4
},
],
'single_data': [
{
'x': 6,
'y': 11
},
],
}
made = TestStruct.make(test_data)
assert len(made.vardata) == 2
assert made.single_data.x == 6
assert made.single_data.y == 11
def test_single_element_2(self):
TestStruct = Message('TestStruct', [
('length_in_objects', 'H', 'vardata'),
('vardata', self.VarTest, 'length_in_objects'),
('single_data', self.VarTest),
])
test_data = {
'length': 2,
'vardata': [
{
'x': 1,
'y': 2
},
{
'x': 3,
'y': 4
},
],
'single_data': {
'x': 6,
'y': 11
},
}
made = TestStruct.make(test_data)
assert len(made.vardata) == 2
assert made.single_data.x == 6
assert made.single_data.y == 11