Add additional coverage for starting noise connections (#653)

aioesphomeapi/connection.py

@@ -20,7 +20,8 @@ from google.protobuf import message
 
 import aioesphomeapi.host_resolver as hr
 
-from ._frame_helper import APINoiseFrameHelper, APIPlaintextFrameHelper
+from ._frame_helper.noise import APINoiseFrameHelper
+from ._frame_helper.plain_text import APIPlaintextFrameHelper
 from .api_pb2 import (  # type: ignore
     ConnectRequest,
     ConnectResponse,

tests/conftest.py

@@ -57,13 +57,33 @@ def connection_params() -> ConnectionParams:
 
 
 @pytest.fixture
-def conn(connection_params) -> APIConnection:
-    async def on_stop(expected_disconnect: bool) -> None:
-        pass
+def noise_connection_params() -> ConnectionParams:
+    return ConnectionParams(
+        address="fake.address",
+        port=6052,
+        password=None,
+        client_info="Tests client",
+        keepalive=KEEP_ALIVE_INTERVAL,
+        zeroconf_manager=ZeroconfManager(),
+        noise_psk="QRTIErOb/fcE9Ukd/5qA3RGYMn0Y+p06U58SCtOXvPc=",
+        expected_name="test",
+    )
 
+
+async def on_stop(expected_disconnect: bool) -> None:
+    pass
+
+
+@pytest.fixture
+def conn(connection_params: ConnectionParams) -> APIConnection:
     return APIConnection(connection_params, on_stop)
 
 
+@pytest.fixture
+def noise_conn(noise_connection_params: ConnectionParams) -> APIConnection:
+    return APIConnection(noise_connection_params, on_stop)
+
+
 @pytest_asyncio.fixture(name="plaintext_connect_task_no_login")
 async def plaintext_connect_task_no_login(
     conn: APIConnection, resolve_host, socket_socket, event_loop

tests/test__frame_helper.py

@@ -596,6 +596,31 @@ async def test_init_plaintext_with_wrong_preamble(conn: APIConnection):
         await task
 
 
+@pytest.mark.asyncio
+async def test_init_noise_with_wrong_byte_marker(noise_conn: APIConnection) -> None:
+    loop = asyncio.get_event_loop()
+    transport = MagicMock()
+    protocol: APINoiseFrameHelper | None = None
+
+    async def _create_connection(create, sock, *args, **kwargs):
+        nonlocal protocol
+        protocol = create()
+        protocol.connection_made(transport)
+        return transport, protocol
+
+    with patch.object(loop, "create_connection", side_effect=_create_connection):
+        task = asyncio.create_task(noise_conn._connect_init_frame_helper())
+        await asyncio.sleep(0)
+
+        assert protocol is not None
+        assert isinstance(noise_conn._frame_helper, APINoiseFrameHelper)
+
+        protocol.data_received(b"\x00\x00\x00")
+
+        with pytest.raises(ProtocolAPIError, match="Marker byte invalid"):
+            await task
+
+
 @pytest.mark.asyncio
 async def test_eof_received_closes_connection(
     plaintext_connect_task_with_login: tuple[