Fix group member planning for low brightness

tests/test_solver.py

@@ -2,7 +2,7 @@ from __future__ import annotations
 
 from lights_config import GROUPS, LIGHTS
 from ha_deconz_bridge.color import Color
-from ha_deconz_bridge.debugger.web_debugger import _combine_specs, _group_debug_spec
+from ha_deconz_bridge.debugger.web_debugger import _combine_specs, _group_debug_spec, _solve_group_request
 from ha_deconz_bridge.lights import ChannelSpec, ControllerModeSpec, ControllerSpec, VirtualLightSpec
 from ha_deconz_bridge.solver import solve_light
 from ha_deconz_bridge.solver_model import compile_light_model
@@ -686,3 +686,27 @@ def test_example_all_lights_ct_sweep_does_not_use_unused_onoff_reference() -> No
         previous = levels
 
     assert max_delta < 0.9
+
+
+def test_debugger_group_low_brightness_keeps_onoff_members_off() -> None:
+    group = GROUPS["Living Room"]
+    group_spec = _group_debug_spec(group, LIGHTS)
+    models = {
+        name: compile_light_model(spec)
+        for name, spec in LIGHTS.items()
+    }
+
+    result = _solve_group_request(
+        group,
+        LIGHTS,
+        group_spec,
+        {"mode": "color_temp", "brightness": 1, "color_temp": 500},
+        model_for_light=models.__getitem__,
+    )
+
+    assert result["commands"]["plug_a"]["on"] is False
+    assert result["commands"]["plug_b"]["on"] is False
+    assert result["channel_levels"].get("plug_a.onoff.w", 0.0) == 0.0
+    assert result["channel_levels"].get("plug_b.onoff.w", 0.0) == 0.0
+    assert result["channel_levels"].get("fixed_a.color_temp.ww", 0.0) == 0.0
+    assert result["channel_levels"].get("fixed_b.color_temp.ww", 0.0) == 0.0