Add app panel (#157554)

Co-authored-by: Petar Petrov <MindFreeze@users.noreply.github.com>

homeassistant/components/hassio/__init__.py

@@ -16,7 +16,7 @@ from aiohasupervisor.models import GreenOptions, YellowOptions  # noqa: F401
 import voluptuous as vol
 
 from homeassistant.auth.const import GROUP_ID_ADMIN
-from homeassistant.components import panel_custom
+from homeassistant.components import frontend, panel_custom
 from homeassistant.components.homeassistant import async_set_stop_handler
 from homeassistant.components.http import StaticPathConfig
 from homeassistant.config_entries import SOURCE_SYSTEM, ConfigEntry
@@ -292,6 +292,7 @@ async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:  # noqa:
         return False
 
     async_load_websocket_api(hass)
+    frontend.async_register_built_in_panel(hass, "app")
 
     host = os.environ["SUPERVISOR"]
     websession = async_get_clientsession(hass)

tests/components/hassio/test_init.py

@@ -260,6 +260,27 @@ async def test_setup_api_panel(
     }
 
 
+async def test_setup_app_panel(hass: HomeAssistant) -> None:
+    """Test app panel is registered."""
+    with patch.dict(os.environ, MOCK_ENVIRON):
+        result = await async_setup_component(hass, "hassio", {})
+        await hass.async_block_till_done()
+        assert result
+
+    panels = hass.data[frontend.DATA_PANELS]
+
+    assert panels.get("app").to_response() == {
+        "component_name": "app",
+        "icon": None,
+        "title": None,
+        "default_visible": True,
+        "config": None,
+        "url_path": "app",
+        "require_admin": False,
+        "config_panel_domain": None,
+    }
+
+
 async def test_setup_api_push_api_data(
     hass: HomeAssistant,
     aioclient_mock: AiohttpClientMocker,