From 676edb610f6cbb62287ea204c875db490a5125e9 Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@koston.org>
Date: Sat, 5 Feb 2022 10:59:32 -0600
Subject: [PATCH] Add coverage for color_rgbww_to_rgb, fix divzero case
 (#65721)

---
 homeassistant/util/color.py |  5 ++++-
 tests/util/test_color.py    | 43 +++++++++++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+), 1 deletion(-)

diff --git a/homeassistant/util/color.py b/homeassistant/util/color.py
index f055a5f32eb2..21c877f9377f 100644
--- a/homeassistant/util/color.py
+++ b/homeassistant/util/color.py
@@ -472,7 +472,10 @@ def color_rgbww_to_rgb(
     except ZeroDivisionError:
         ct_ratio = 0.5
     color_temp_mired = min_mireds + ct_ratio * mired_range
-    color_temp_kelvin = color_temperature_mired_to_kelvin(color_temp_mired)
+    if color_temp_mired:
+        color_temp_kelvin = color_temperature_mired_to_kelvin(color_temp_mired)
+    else:
+        color_temp_kelvin = 0
     w_r, w_g, w_b = color_temperature_to_rgb(color_temp_kelvin)
     white_level = max(cw, ww) / 255
 
diff --git a/tests/util/test_color.py b/tests/util/test_color.py
index e9ab935f6ab3..b77540acc2be 100644
--- a/tests/util/test_color.py
+++ b/tests/util/test_color.py
@@ -405,6 +405,49 @@ def test_color_rgb_to_rgbww():
     assert color_util.color_rgb_to_rgbww(255, 255, 255, 1, 5) == (103, 69, 0, 255, 255)
 
 
+def test_color_rgbww_to_rgb():
+    """Test color_rgbww_to_rgb conversions."""
+    assert color_util.color_rgbww_to_rgb(0, 54, 98, 255, 255, 154, 370) == (
+        255,
+        255,
+        255,
+    )
+    assert color_util.color_rgbww_to_rgb(255, 255, 255, 0, 0, 154, 370) == (
+        255,
+        255,
+        255,
+    )
+    assert color_util.color_rgbww_to_rgb(0, 118, 241, 255, 255, 154, 370) == (
+        163,
+        204,
+        255,
+    )
+    assert color_util.color_rgbww_to_rgb(0, 27, 49, 128, 128, 154, 370) == (
+        128,
+        128,
+        128,
+    )
+    assert color_util.color_rgbww_to_rgb(0, 14, 25, 64, 64, 154, 370) == (64, 64, 64)
+    assert color_util.color_rgbww_to_rgb(9, 64, 0, 38, 38, 154, 370) == (32, 64, 16)
+    assert color_util.color_rgbww_to_rgb(0, 0, 0, 0, 0, 154, 370) == (0, 0, 0)
+    assert color_util.color_rgbww_to_rgb(103, 69, 0, 255, 255, 153, 370) == (
+        255,
+        193,
+        112,
+    )
+    assert color_util.color_rgbww_to_rgb(255, 255, 255, 0, 0, 0, 0) == (255, 255, 255)
+    assert color_util.color_rgbww_to_rgb(255, 255, 255, 255, 255, 0, 0) == (
+        255,
+        161,
+        128,
+    )
+    assert color_util.color_rgbww_to_rgb(255, 255, 255, 255, 255, 0, 370) == (
+        255,
+        245,
+        237,
+    )
+
+
 def test_color_temperature_to_rgbww():
     """Test color temp to warm, cold conversion.