Implement HID++ 1.0 fake device for some basic requests

The fake device is a simplified, working implementation of a HID++ 1.0
device, that behaves similar to the real hardware. This allows tests to
be closer to the real world.

Related #2905

lib/logitech_receiver/hidpp10.py

@@ -191,7 +191,7 @@ class Hidpp10:
     def get_notification_flags(self, device: Device):
         return self._get_register(device, Registers.NOTIFICATIONS)
 
-    def set_notification_flags(self, device: Device, *flag_bits: NotificationFlag):
+    def set_notification_flags(self, device: Device, *flag_bits: NotificationFlag) -> None:
         assert device is not None
 
         # Avoid a call if the device is not online,

tests/conftest.py

@@ -1,8 +1,15 @@
 import pytest
 
+from fakes import hidpp10_device
+
 from .fakes import hidpp20_device
 
 
+@pytest.fixture
+def device_hidpp10():
+    yield hidpp10_device.Hidpp10Device()
+
+
 @pytest.fixture
 def device():
     yield hidpp20_device.Hidpp20Device()

tests/fakes/hidpp10_device.py

@@ -0,0 +1,18 @@
+from logitech_receiver.hidpp10_constants import Registers
+
+
+class Hidpp10Device:
+    def __init__(self):
+        self._iteration = 0
+
+    @property
+    def kind(self):
+        pass
+
+    def request(self, request_id, *params, no_reply=False):
+        if request_id == 0x8100 + Registers.BATTERY_STATUS:
+            return b"fff"
+        elif request_id == 0x8000:
+            return bytes([0x10, 0x10, 0x00])
+
+        raise RuntimeError(f"Unsupported feature: {request_id:04X}")

tests/logitech_receiver/test_hidpp10.py

@@ -0,0 +1,27 @@
+from logitech_receiver import hidpp10
+from logitech_receiver import hidpp10_constants
+from logitech_receiver.hidpp10_constants import Registers
+
+_hidpp10 = hidpp10.Hidpp10()
+
+
+def test_read_register(device_hidpp10):
+    result = hidpp10.read_register(
+        device_hidpp10,
+        register=Registers.BATTERY_STATUS,
+    )
+
+    assert result == bytes.fromhex("666666")
+
+
+def test_set_notification_flags(mocker, device_hidpp10):
+    spy_request = mocker.spy(device_hidpp10, "request")
+
+    result = _hidpp10.set_notification_flags(
+        device_hidpp10,
+        hidpp10_constants.NotificationFlag.BATTERY_STATUS,
+        hidpp10_constants.NotificationFlag.WIRELESS,
+    )
+
+    spy_request.assert_called_once_with(0x8000 | Registers.NOTIFICATIONS, b"\x10\x01\x00")
+    assert result is not None