tests: Add tests for serializing CAN frames

More cases are welcome. :)

tests/pytest/test_can_message.py

@@ -0,0 +1,20 @@
+# SPDX-FileCopyrightText: AISEC Pentesting Team
+#
+# SPDX-License-Identifier: Apache-2.0
+
+import sys
+
+assert sys.platform.startswith("linux"), "unsupported platform"
+
+from gallia.transports.can import CANMessage
+
+
+def test_can_message_serialization() -> None:
+    input_data = [
+        b"\x00\x07\x00\x00\x04\x00\x00\x00s\x02>\x00\x00\x00\x00\x00",
+    ]
+    output_data = [CANMessage(arbitration_id=0x700, dlc=4, data=bytes([0x73, 0x02, 0x3E, 0x00]))]
+
+    for i in range(len(input_data)):
+        frame = CANMessage.unpack(input_data[i])
+        assert frame == output_data[i]