How to use the pythonping.icmp.ICMP.generate_from_raw function in pythonping

def test_is_valid(self):
        """Verifies that understands if receives a packet with valid or invalid checksum"""
        ip_header_offset = b''.join([b'0' for _ in range(20)])
        # Following two packets have a good checksum
        packet = icmp.ICMP.generate_from_raw(ip_header_offset + b'\x00\x00\xbe\xdb\x01\x00\x01\x00banana')
        self.assertEqual(packet.received_checksum, packet.expected_checksum, 'Checksum validation failed')
        packet = icmp.ICMP.generate_from_raw(ip_header_offset + b'\x08\x00@\xca\xb47\x01\x00random text goes here')
        self.assertEqual(packet.received_checksum, packet.expected_checksum, 'Checksum validation failed')
        # Packet 'does' instead of 'goes'
        packet = icmp.ICMP.generate_from_raw(ip_header_offset + b'\x08\x00\x9c\xd0X1\x01\x00random text does here')
        self.assertNotEqual(packet.received_checksum, packet.expected_checksum, 'Checksum validation failed')

def test_unpack(self):
        """Verifies that reads data correctly from a packet"""
        ip_header_offset = b''.join([b'0' for _ in range(20)])

        packet = icmp.ICMP.generate_from_raw(ip_header_offset + b'\x00\x00\xbe\xdb\x01\x00\x01\x00banana')
        self.assertEqual(packet.message_type, 0, 'Failed to extract message type')
        self.assertEqual(packet.message_code, 0, 'Failed to extract message code')
        self.assertEqual(packet.id, 1, 'Failed to extract id')
        self.assertEqual(packet.payload, b'banana', 'Failed to extract payload')

        packet = icmp.ICMP.generate_from_raw(ip_header_offset + b'\x00\x00Q\x9d\x10\x00\x01\x00random text goes here')
        self.assertEqual(packet.message_type, 0, 'Failed to extract message type')
        self.assertEqual(packet.message_code, 0, 'Failed to extract message code')
        self.assertEqual(packet.id, 16, 'Failed to extract id')
        self.assertEqual(packet.payload, b'random text goes here', 'Failed to extract payload')

        packet = icmp.ICMP.generate_from_raw(ip_header_offset + b'\x08\x00I\x9d\x10\x00\x01\x00random text goes here')
        self.assertEqual(packet.message_type, 8, 'Failed to extract message type')
        self.assertEqual(packet.message_code, 0, 'Failed to extract message code')
        self.assertEqual(packet.id, 16, 'Failed to extract id')
        self.assertEqual(packet.payload, b'random text goes here', 'Failed to extract payload')