Fix attribute-defined-outside-init pylint warnings in tests (#119471)

tests/components/flic/test_binary_sensor.py

@@ -12,6 +12,7 @@ class _MockFlicClient:
         self.addresses = button_addresses
         self.get_info_callback = None
         self.scan_wizard = None
+        self.channel = None
 
     def close(self):
         pass

tests/components/hdmi_cec/__init__.py

@@ -21,6 +21,7 @@ class MockHDMIDevice:
         self.turn_off = Mock()
         self.send_command = Mock()
         self.async_send_command = AsyncMock()
+        self._update = None
 
     def __getattr__(self, name):
         """Get attribute from `_values` if not explicitly set."""

tests/components/refoss/__init__.py

@@ -22,6 +22,7 @@ class FakeDiscovery:
         self.mock_devices = {"abc": build_device_mock()}
         self.last_mock_infos = {}
         self._listeners = []
+        self.sock = None
 
     def add_listener(self, listener: Listener) -> None:
         """Add an event listener."""

tests/components/universal/test_media_player.py

@@ -70,6 +70,7 @@ class MockMediaPlayer(media_player.MediaPlayerEntity):
         self._media_image_url = None
         self._shuffle = False
         self._sound_mode = None
+        self._repeat = None
 
         self.service_calls = {
             "turn_on": async_mock_service(

tests/components/yeelight/__init__.py

@@ -115,6 +115,7 @@ class MockAsyncBulb:
         self.bulb_type = bulb_type
         self._async_callback = None
         self._cannot_connect = cannot_connect
+        self.capabilities = None
 
     async def async_listen(self, callback):
         """Mock the listener."""