Add websock command to query device for triggers (#24044)

* Add websock command to query device for triggers

* Lint

* Refactor

* Add support for domain automations

* Make device automation an automation platform

* lint

* Support device_id in light trigger

* Review comments

* Add tests

* Add tests

* lint

tests/components/device_automation/test_init.py

@@ -0,0 +1,67 @@
+"""The test for light device automation."""
+import pytest
+
+from homeassistant.setup import async_setup_component
+from homeassistant.components.websocket_api.const import TYPE_RESULT
+from homeassistant.helpers import device_registry
+
+
+from tests.common import (
+    MockConfigEntry, mock_device_registry, mock_registry)
+
+
+@pytest.fixture
+def device_reg(hass):
+    """Return an empty, loaded, registry."""
+    return mock_device_registry(hass)
+
+
+@pytest.fixture
+def entity_reg(hass):
+    """Return an empty, loaded, registry."""
+    return mock_registry(hass)
+
+
+def _same_triggers(a, b):
+    if len(a) != len(b):
+        return False
+
+    for d in a:
+        if d not in b:
+            return False
+    return True
+
+
+async def test_websocket_get_triggers(
+        hass, hass_ws_client, device_reg, entity_reg):
+    """Test we get the expected triggers from a light through websocket."""
+    await async_setup_component(hass, 'device_automation', {})
+    config_entry = MockConfigEntry(domain='test', data={})
+    config_entry.add_to_hass(hass)
+    device_entry = device_reg.async_get_or_create(
+        config_entry_id=config_entry.entry_id,
+        connections={
+            (device_registry.CONNECTION_NETWORK_MAC, '12:34:56:AB:CD:EF')
+        })
+    entity_reg.async_get_or_create(
+        'light', 'test', '5678', device_id=device_entry.id)
+    expected_triggers = [
+      {'platform': 'device', 'domain': 'light', 'type': 'turn_off',
+       'device_id': device_entry.id, 'entity_id': 'light.test_5678'},
+      {'platform': 'device', 'domain': 'light', 'type': 'turn_on',
+       'device_id': device_entry.id, 'entity_id': 'light.test_5678'},
+    ]
+
+    client = await hass_ws_client(hass)
+    await client.send_json({
+        'id': 1,
+        'type': 'device_automation/list_triggers',
+        'device_id': device_entry.id
+    })
+    msg = await client.receive_json()
+
+    assert msg['id'] == 1
+    assert msg['type'] == TYPE_RESULT
+    assert msg['success']
+    triggers = msg['result']['triggers']
+    assert _same_triggers(triggers, expected_triggers)