How to use the cantools.db.Message function in cantools

start=32,
                               length=8,
                               is_multiplexer=True),
            cantools.db.Signal(name='S7',
                               start=40,
                               length=24,
                               multiplexer_ids=[1],
                               multiplexer_signal='S6'),
            cantools.db.Signal(name='S8',
                               start=40,
                               length=8,
                               multiplexer_ids=[2],
                               multiplexer_signal='S6')
        ]

        message = cantools.db.Message(frame_id=1,
                                      name='M0',
                                      length=8,
                                      signals=signals)

        self.assertEqual(message.signal_tree,
                         [
                             {
                                 'S0': {
                                     0: [
                                         {
                                             'S1': {
                                                 0: ['S2', 'S3'],
                                                 2: ['S4']
                                             }
                                         }
                                     ],

multiplexer_ids=[1],
                                       multiplexer_signal='S4'),
                    cantools.db.Signal('S7',
                                       14,
                                       1,
                                       'big_endian',
                                       multiplexer_ids=[0],
                                       multiplexer_signal='S6')
                ],
                'The signals S6 and S4 are overlapping in message M.'
            )
        ]

        for signals, expected_overlpping in datas:
            with self.assertRaises(cantools.db.Error) as cm:
                cantools.db.Message(1, 'M', 7, signals, strict=True)

            self.assertEqual(str(cm.exception), expected_overlpping)

def test_missing_dbc_specifics(self):
        db = cantools.db.Database()

        node = cantools.db.Node('FakeNode', 'Comment')
        db.nodes.append(node)

        signals = [cantools.db.Signal('C', 0, 8)]
        message = cantools.db.Message(0x20, 'D', 8, signals)
        db.messages.append(message)

        # Test that dump executes without raising.
        db.as_dbc_string()

start=32,
                               length=8,
                               is_multiplexer=True),
            cantools.db.Signal(name='S7',
                               start=40,
                               length=24,
                               multiplexer_ids=[1],
                               multiplexer_signal='S6'),
            cantools.db.Signal(name='S8',
                               start=40,
                               length=8,
                               multiplexer_ids=[2],
                               multiplexer_signal='S6')
        ]

        message = cantools.db.Message(frame_id=1,
                                      name='M0',
                                      length=8,
                                      signals=signals)

        self.assertEqual(message.signal_tree,
                         [
                             {
                                 'S0': {
                                     0: [
                                         {
                                             'S1': {
                                                 0: ['S2', 'S3'],
                                                 2: ['S4']
                                             }
                                         }
                                     ],

multiplexer_ids=[1],
                                       multiplexer_signal='S4'),
                    cantools.db.Signal('S7',
                                       14,
                                       1,
                                       'big_endian',
                                       multiplexer_ids=[0],
                                       multiplexer_signal='S6')
                ],
                'The signals S6 and S4 are overlapping in message M.'
            )
        ]

        for signals, expected_overlpping in datas:
            with self.assertRaises(cantools.db.Error) as cm:
                cantools.db.Message(1, 'M', 7, signals, strict=True)

            self.assertEqual(str(cm.exception), expected_overlpping)

Data(start=56, length=2, byte_order='big_endian'),
            Data(start=63, length=2, byte_order='little_endian'),
            Data(start=64, length=1, byte_order='big_endian'),
            Data(start=64, length=1, byte_order='little_endian'),
            Data(start=7, length=65, byte_order='big_endian'),
            Data(start=0, length=65, byte_order='little_endian')
        ]

        for data in datas:
            signal = cantools.db.Signal('S',
                                        data.start,
                                        data.length,
                                        data.byte_order)

            with self.assertRaises(cantools.db.Error) as cm:
                cantools.db.Message(1,
                                    'M',
                                    8,
                                    [signal],
                                    strict=True)

            self.assertEqual(str(cm.exception),
                             'The signal S does not fit in message M.')

(
                Data(start=2, length=7, byte_order='little_endian'),
                Data(start=1, length=9, byte_order='big_endian')
            )
        ]

        for data0, data1 in datas:
            signal_0 = cantools.db.Signal('S0',
                                          data0.start,
                                          data0.length,
                                          data0.byte_order)
            signal_1 = cantools.db.Signal('S1',
                                          data1.start,
                                          data1.length,
                                          data1.byte_order)
            cantools.db.Message(1,
                                'M',
                                7,
                                [signal_0, signal_1],
                                strict=True)

        # Signals overlapping.
        datas = [
            (
                Data(start=7, length=1, byte_order='big_endian'),
                Data(start=7, length=1, byte_order='big_endian')
            ),
            (
                Data(start=7, length=8, byte_order='big_endian'),
                Data(start=5, length=10, byte_order='big_endian')
            ),
            (

def test_missing_dbc_specifics(self):
        db = cantools.db.Database()

        node = cantools.db.Node('FakeNode', 'Comment')
        db.nodes.append(node)

        signals = [cantools.db.Signal('C', 0, 8)]
        message = cantools.db.Message(0x20, 'D', 8, signals)
        db.messages.append(message)

        # Test that dump executes without raising.
        db.as_dbc_string()

"""

        iterations = 10000

        signals = [
            cantools.db.Signal('S0',  7, 4,  'big_endian'),
            cantools.db.Signal('S1',  3, 4,  'big_endian'),
            cantools.db.Signal('S2', 15, 4,  'big_endian'),
            cantools.db.Signal('S3', 11, 8,  'big_endian'),
            cantools.db.Signal('S4', 19, 1,  'big_endian'),
            cantools.db.Signal('S5', 17, 17, 'big_endian'),
            cantools.db.Signal('S6', 47, 15, 'big_endian')
        ]

        message = cantools.db.Message(frame_id=1,
                                      name='M0',
                                      length=8,
                                      signals=signals)

        # Encode.
        def encode():
            message.encode({
                'S0': 3,
                'S1': 0,
                'S2': 2,
                'S3': 55,
                'S4': 1,
                'S5': 2323,
                'S6': 3224
            })