Do async_setup_platform in background (#36244)

Co-authored-by: J. Nick Koston <nick@koston.org>

tests/components/openuv/test_config_flow.py

@@ -1,5 +1,6 @@
 """Define tests for the OpenUV config flow."""
 from pyopenuv.errors import InvalidApiKeyError
+import pytest
 
 from homeassistant import data_entry_flow
 from homeassistant.components.openuv import DOMAIN
@@ -15,6 +16,17 @@ from tests.async_mock import patch
 from tests.common import MockConfigEntry
 
 
+@pytest.fixture(autouse=True)
+def mock_setup():
+    """Prevent setup."""
+    with patch(
+        "homeassistant.components.openuv.async_setup", return_value=True,
+    ), patch(
+        "homeassistant.components.openuv.async_setup_entry", return_value=True,
+    ):
+        yield
+
+
 async def test_duplicate_error(hass):
     """Test that errors are shown when duplicates are added."""
     conf = {