Initial WS support (#2439)

* Initial WS support

* test

* Update frontend to fc7c4af2

* Fix issue with closing states

* log error

* make data optional

* limit stopping states

* Move wrappers to HomeAssistantWebSocket

* use info

* Use call_soon

* Use lookuptable for WS commands

* Fix tests

tests/homeassistant/test_websocket.py

@@ -0,0 +1,49 @@
+"""Test websocket."""
+# pylint: disable=protected-access, import-error
+import logging
+
+from awesomeversion import AwesomeVersion
+
+from supervisor.coresys import CoreSys
+
+
+async def test_send_command(coresys: CoreSys):
+    """Test websocket error on listen."""
+    client = coresys.homeassistant.websocket._client
+    await coresys.homeassistant.websocket.async_send_command({"type": "test"})
+    client.async_send_command.assert_called_with({"type": "test"})
+
+    await coresys.homeassistant.websocket.async_supervisor_update_event(
+        "test", {"lorem": "ipsum"}
+    )
+    client.async_send_command.assert_called_with(
+        {
+            "type": "supervisor/event",
+            "data": {
+                "event": "supervisor-update",
+                "update_key": "test",
+                "data": {"lorem": "ipsum"},
+            },
+        }
+    )
+
+
+async def test_send_command_old_core_version(coresys: CoreSys, caplog):
+    """Test websocket error on listen."""
+    caplog.set_level(logging.INFO)
+    client = coresys.homeassistant.websocket._client
+    client.ha_version = AwesomeVersion("1970.1.1")
+
+    await coresys.homeassistant.websocket.async_send_command(
+        {"type": "supervisor/event"}
+    )
+
+    assert (
+        "WebSocket command supervisor/event is not supported untill core-2021.2.4"
+        in caplog.text
+    )
+
+    await coresys.homeassistant.websocket.async_supervisor_update_event(
+        "test", {"lorem": "ipsum"}
+    )
+    client.async_send_command.assert_not_called()