Add local calendar diagnostics platform (#89776)

* Add local calendar diagnostics platform

* Use redaction from ical

* Update diagnostics for new ical version

* Apply suggestions from code review

Co-authored-by: epenet <6771947+epenet@users.noreply.github.com>

* Use snapshot tests for local calendar diagnostics

* Setup diagnostics directly in tests rather than via dependencies

---------

Co-authored-by: epenet <6771947+epenet@users.noreply.github.com>

tests/components/local_calendar/test_diagnostics.py

@@ -0,0 +1,62 @@
+"""Tests for diagnostics platform of local calendar."""
+
+from freezegun import freeze_time
+import pytest
+from syrupy.assertion import SnapshotAssertion
+
+from homeassistant.core import HomeAssistant
+from homeassistant.setup import async_setup_component
+
+from .conftest import TEST_ENTITY, ClientFixture
+
+from tests.common import MockConfigEntry
+from tests.components.diagnostics import get_diagnostics_for_config_entry
+from tests.typing import ClientSessionGenerator
+
+
+@pytest.fixture(autouse=True)
+async def setup_diag(hass):
+    """Set up diagnostics platform."""
+    assert await async_setup_component(hass, "diagnostics", {})
+
+
+@freeze_time("2023-03-13 12:05:00-07:00")
+async def test_empty_calendar(
+    hass: HomeAssistant,
+    setup_integration: None,
+    hass_client: ClientSessionGenerator,
+    config_entry: MockConfigEntry,
+    snapshot: SnapshotAssertion,
+) -> None:
+    """Test diagnostics against an empty calendar."""
+    data = await get_diagnostics_for_config_entry(hass, hass_client, config_entry)
+    assert data == snapshot
+
+
+@freeze_time("2023-03-13 12:05:00-07:00")
+async def test_api_date_time_event(
+    hass: HomeAssistant,
+    setup_integration: None,
+    config_entry: MockConfigEntry,
+    hass_client: ClientSessionGenerator,
+    ws_client: ClientFixture,
+    snapshot: SnapshotAssertion,
+) -> None:
+    """Test an event with a start/end date time."""
+
+    client = await ws_client()
+    await client.cmd_result(
+        "create",
+        {
+            "entity_id": TEST_ENTITY,
+            "event": {
+                "summary": "Bastille Day Party",
+                "dtstart": "1997-07-14T17:00:00+00:00",
+                "dtend": "1997-07-15T04:00:00+00:00",
+                "rrule": "FREQ=DAILY",
+            },
+        },
+    )
+
+    data = await get_diagnostics_for_config_entry(hass, hass_client, config_entry)
+    assert data == snapshot