Add snapshot platform tests to rainmachine (#117978)

* Add snapshot tests to rainmachine

* Add sensor and switch tests

tests/components/rainmachine/test_sensor.py

@@ -0,0 +1,34 @@
+"""Test RainMachine sensors."""
+
+from typing import Any
+from unittest.mock import AsyncMock, patch
+
+import pytest
+from syrupy import SnapshotAssertion
+
+from homeassistant.components.rainmachine import DOMAIN
+from homeassistant.const import Platform
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers import entity_registry as er
+from homeassistant.setup import async_setup_component
+
+from tests.common import MockConfigEntry, snapshot_platform
+
+
+@pytest.mark.usefixtures("entity_registry_enabled_by_default")
+async def test_sensors(
+    hass: HomeAssistant,
+    entity_registry: er.EntityRegistry,
+    snapshot: SnapshotAssertion,
+    config: dict[str, Any],
+    config_entry: MockConfigEntry,
+    client: AsyncMock,
+) -> None:
+    """Test sensors."""
+    with (
+        patch("homeassistant.components.rainmachine.Client", return_value=client),
+        patch("homeassistant.components.rainmachine.PLATFORMS", [Platform.SENSOR]),
+    ):
+        assert await async_setup_component(hass, DOMAIN, config)
+        await hass.async_block_till_done()
+    await snapshot_platform(hass, entity_registry, snapshot, config_entry.entry_id)