Abort flux_led discovery if another device gets the ip (#61074)

- If the dhcp reservation expired for the device that
  was at the ip and a new flux_led device appears we
  would discover it because the unique_id did not match

homeassistant/components/flux_led/config_flow.py

@@ -115,7 +115,8 @@ class ConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
         await self.async_set_unique_id(mac)
         self._abort_if_unique_id_configured(updates={CONF_HOST: host})
         for entry in self._async_current_entries(include_ignore=False):
-            if entry.data[CONF_HOST] == host and not entry.unique_id:
+            if entry.data[CONF_HOST] == host:
+                if not entry.unique_id:
                     async_update_entry_from_discovery(self.hass, entry, device)
                 return self.async_abort(reason="already_configured")
         self.context[CONF_HOST] = host

tests/components/flux_led/test_config_flow.py

@@ -40,6 +40,8 @@ from . import (
 
 from tests.common import MockConfigEntry
 
+MAC_ADDRESS_DIFFERENT = "ff:bb:ff:dd:ee:ff"
+
 
 async def test_discovery(hass: HomeAssistant):
     """Test setting up discovery."""
@@ -472,6 +474,34 @@ async def test_discovered_by_dhcp_or_discovery_adds_missing_unique_id(
     assert config_entry.unique_id == MAC_ADDRESS
 
 
+@pytest.mark.parametrize(
+    "source, data",
+    [
+        (config_entries.SOURCE_DHCP, DHCP_DISCOVERY),
+        (config_entries.SOURCE_DISCOVERY, FLUX_DISCOVERY),
+    ],
+)
+async def test_discovered_by_dhcp_or_discovery_mac_address_mismatch_host_already_configured(
+    hass, source, data
+):
+    """Test we abort if the host is already configured but the mac does not match."""
+    config_entry = MockConfigEntry(
+        domain=DOMAIN, data={CONF_HOST: IP_ADDRESS}, unique_id=MAC_ADDRESS_DIFFERENT
+    )
+    config_entry.add_to_hass(hass)
+
+    with _patch_discovery(), _patch_wifibulb():
+        result = await hass.config_entries.flow.async_init(
+            DOMAIN, context={"source": source}, data=data
+        )
+        await hass.async_block_till_done()
+
+    assert result["type"] == RESULT_TYPE_ABORT
+    assert result["reason"] == "already_configured"
+
+    assert config_entry.unique_id == MAC_ADDRESS_DIFFERENT
+
+
 async def test_options(hass: HomeAssistant):
     """Test options flow."""
     config_entry = MockConfigEntry(