Fix brightness command not sent when in white color mode (#150439)

Co-authored-by: epenet <6771947+epenet@users.noreply.github.com>

homeassistant/components/tuya/light.py

@@ -663,8 +663,11 @@ class TuyaLightEntity(TuyaEntity, LightEntity):
                 },
             ]
 
-        elif ATTR_BRIGHTNESS in kwargs and self._brightness:
+        elif self._brightness and (ATTR_BRIGHTNESS in kwargs or ATTR_WHITE in kwargs):
-            brightness = kwargs[ATTR_BRIGHTNESS]
+            if ATTR_BRIGHTNESS in kwargs:
+                brightness = kwargs[ATTR_BRIGHTNESS]
+            else:
+                brightness = kwargs[ATTR_WHITE]
 
             # If there is a min/max value, the brightness is actually limited.
             # Meaning it is actually not on a 0-255 scale.

tests/components/tuya/test_light.py

@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+from typing import Any
 from unittest.mock import patch
 
 import pytest
@@ -42,11 +43,58 @@ async def test_platform_setup_and_discovery(
     "mock_device_code",
     ["dj_mki13ie507rlry4r"],
 )
+@pytest.mark.parametrize(
+    ("turn_on_input", "expected_commands"),
+    [
+        (
+            {
+                "white": True,
+            },
+            [
+                {"code": "switch_led", "value": True},
+                {"code": "work_mode", "value": "white"},
+                {"code": "bright_value_v2", "value": 546},
+            ],
+        ),
+        (
+            {
+                "brightness": 150,
+            },
+            [
+                {"code": "switch_led", "value": True},
+                {"code": "bright_value_v2", "value": 592},
+            ],
+        ),
+        (
+            {
+                "white": True,
+                "brightness": 150,
+            },
+            [
+                {"code": "switch_led", "value": True},
+                {"code": "work_mode", "value": "white"},
+                {"code": "bright_value_v2", "value": 592},
+            ],
+        ),
+        (
+            {
+                "white": 150,
+            },
+            [
+                {"code": "switch_led", "value": True},
+                {"code": "work_mode", "value": "white"},
+                {"code": "bright_value_v2", "value": 592},
+            ],
+        ),
+    ],
+)
 async def test_turn_on_white(
     hass: HomeAssistant,
     mock_manager: ManagerCompat,
     mock_config_entry: MockConfigEntry,
     mock_device: CustomerDevice,
+    turn_on_input: dict[str, Any],
+    expected_commands: list[dict[str, Any]],
 ) -> None:
     """Test turn_on service."""
     entity_id = "light.garage_light"
@@ -59,16 +107,13 @@ async def test_turn_on_white(
         SERVICE_TURN_ON,
         {
             "entity_id": entity_id,
-            "white": 150,
+            **turn_on_input,
         },
     )
     await hass.async_block_till_done()
     mock_manager.send_commands.assert_called_once_with(
         mock_device.id,
-        [
+        expected_commands,
-            {"code": "switch_led", "value": True},
-            {"code": "work_mode", "value": "white"},
-        ],
     )