Avoid divide by zero errors in tplink light integration (#48235)

tests/components/tplink/test_light.py

@@ -60,6 +60,116 @@ class SmartSwitchMockData(NamedTuple):
     get_sysinfo_mock: Mock
 
 
+@pytest.fixture(name="unknown_light_mock_data")
+def unknown_light_mock_data_fixture() -> None:
+    """Create light mock data."""
+    sys_info = {
+        "sw_ver": "1.2.3",
+        "hw_ver": "2.3.4",
+        "mac": "aa:bb:cc:dd:ee:ff",
+        "mic_mac": "00:11:22:33:44",
+        "type": "light",
+        "hwId": "1234",
+        "fwId": "4567",
+        "oemId": "891011",
+        "dev_name": "light1",
+        "rssi": 11,
+        "latitude": "0",
+        "longitude": "0",
+        "is_color": True,
+        "is_dimmable": True,
+        "is_variable_color_temp": True,
+        "model": "Foo",
+        "alias": "light1",
+    }
+    light_state = {
+        "on_off": True,
+        "dft_on_state": {
+            "brightness": 12,
+            "color_temp": 3200,
+            "hue": 110,
+            "saturation": 90,
+        },
+        "brightness": 13,
+        "color_temp": 3300,
+        "hue": 110,
+        "saturation": 90,
+    }
+
+    def set_light_state(state) -> None:
+        nonlocal light_state
+        drt_on_state = light_state["dft_on_state"]
+        drt_on_state.update(state.get("dft_on_state", {}))
+
+        light_state.update(state)
+        light_state["dft_on_state"] = drt_on_state
+        return light_state
+
+    set_light_state_patch = patch(
+        "homeassistant.components.tplink.common.SmartBulb.set_light_state",
+        side_effect=set_light_state,
+    )
+    get_light_state_patch = patch(
+        "homeassistant.components.tplink.common.SmartBulb.get_light_state",
+        return_value=light_state,
+    )
+    current_consumption_patch = patch(
+        "homeassistant.components.tplink.common.SmartDevice.current_consumption",
+        return_value=3.23,
+    )
+    get_sysinfo_patch = patch(
+        "homeassistant.components.tplink.common.SmartDevice.get_sysinfo",
+        return_value=sys_info,
+    )
+    get_emeter_daily_patch = patch(
+        "homeassistant.components.tplink.common.SmartDevice.get_emeter_daily",
+        return_value={
+            1: 1.01,
+            2: 1.02,
+            3: 1.03,
+            4: 1.04,
+            5: 1.05,
+            6: 1.06,
+            7: 1.07,
+            8: 1.08,
+            9: 1.09,
+            10: 1.10,
+            11: 1.11,
+            12: 1.12,
+        },
+    )
+    get_emeter_monthly_patch = patch(
+        "homeassistant.components.tplink.common.SmartDevice.get_emeter_monthly",
+        return_value={
+            1: 2.01,
+            2: 2.02,
+            3: 2.03,
+            4: 2.04,
+            5: 2.05,
+            6: 2.06,
+            7: 2.07,
+            8: 2.08,
+            9: 2.09,
+            10: 2.10,
+            11: 2.11,
+            12: 2.12,
+        },
+    )
+
+    with set_light_state_patch as set_light_state_mock, get_light_state_patch as get_light_state_mock, current_consumption_patch as current_consumption_mock, get_sysinfo_patch as get_sysinfo_mock, get_emeter_daily_patch as get_emeter_daily_mock, get_emeter_monthly_patch as get_emeter_monthly_mock:
+        yield LightMockData(
+            sys_info=sys_info,
+            light_state=light_state,
+            set_light_state=set_light_state,
+            set_light_state_mock=set_light_state_mock,
+            get_light_state_mock=get_light_state_mock,
+            current_consumption_mock=current_consumption_mock,
+            get_sysinfo_mock=get_sysinfo_mock,
+            get_emeter_daily_mock=get_emeter_daily_mock,
+            get_emeter_monthly_mock=get_emeter_monthly_mock,
+        )
+
+
 @pytest.fixture(name="light_mock_data")
 def light_mock_data_fixture() -> None:
     """Create light mock data."""
@@ -343,6 +453,31 @@ async def test_smartswitch(
     assert sys_info["brightness"] == 66
 
 
+async def test_unknown_light(
+    hass: HomeAssistant, unknown_light_mock_data: LightMockData
+) -> None:
+    """Test function."""
+    await async_setup_component(hass, HA_DOMAIN, {})
+    await hass.async_block_till_done()
+
+    await async_setup_component(
+        hass,
+        tplink.DOMAIN,
+        {
+            tplink.DOMAIN: {
+                CONF_DISCOVERY: False,
+                CONF_LIGHT: [{CONF_HOST: "123.123.123.123"}],
+            }
+        },
+    )
+    await hass.async_block_till_done()
+
+    state = hass.states.get("light.light1")
+    assert state.state == "on"
+    assert state.attributes["min_mireds"] == 200
+    assert state.attributes["max_mireds"] == 370
+
+
 async def test_light(hass: HomeAssistant, light_mock_data: LightMockData) -> None:
     """Test function."""
     light_state = light_mock_data.light_state