MCP-CAN

import json import time from typer.testing import CliRunner from mcp_can import cli as cli_module class FakeMsg: def __init__(self, arbitration_id: int, data: bytes, timestamp: float | None = None): self.arbitration_id = arbitration_id self.data = data self.timestamp = time.time() if timestamp is None else timestamp class FakeBus: def __init__(self, messages: list[FakeMsg]): self._messages = messages self.sent = [] def recv(self, timeout: float | None = None): if self._messages: return self._messages.pop(0) return None def send(self, msg): self.sent.append(msg) runner = CliRunner() def test_cli_frames_minimal(monkeypatch): # Arrange: fake bus returns a single frame fake = FakeBus([FakeMsg(0x100, bytes([1, 2, 3, 4, 5, 6, 7, 8]))]) monkeypatch.setattr(cli_module, "make_bus", lambda *a, **k: fake) # Act result = runner.invoke(cli_module.app, ["frames", "--seconds", "0.02"]) # short capture # Assert assert result.exit_code == 0, result.output out = json.loads(result.stdout) assert isinstance(out, list) assert len(out) >= 1 first = out[0] assert first["arbitration_id"] == hex(0x100) assert first["data"] == [1, 2, 3, 4, 5, 6, 7, 8] def test_cli_obd_request_basic(monkeypatch): # Arrange: fake bus will return a single-frame OBD-II positive response # Example response to 0x01 0x0D (Vehicle speed): 0x41 0x0D <A> response = FakeMsg(0x7E8, bytes([3, 0x41, 0x0D, 50, 0, 0, 0, 0])) fake = FakeBus([response]) monkeypatch.setattr(cli_module, "make_bus", lambda *a, **k: fake) # Act result = runner.invoke(cli_module.app, ["obd-request", "--service", "0x01", "--pid", "0x0D"]) # Assert assert result.exit_code == 0, result.output out = json.loads(result.stdout) assert out["arbitration_id"] == hex(0x7E8) assert out["data"][0] == 3 # length assert out["data"][1] == 0x41 and out["data"][2] == 0x0D