Improve zeroconf test fixture (#49657)

tests/components/conftest.py

@@ -3,12 +3,15 @@ from unittest.mock import patch
 
 import pytest
 
-from homeassistant.components import zeroconf
 
-zeroconf.orig_install_multiple_zeroconf_catcher = (
-    zeroconf.install_multiple_zeroconf_catcher
-)
-zeroconf.install_multiple_zeroconf_catcher = lambda zc: None
+@pytest.fixture(scope="session", autouse=True)
+def patch_zeroconf_multiple_catcher():
+    """Patch zeroconf wrapper that detects if multiple instances are used."""
+    with patch(
+        "homeassistant.components.zeroconf.install_multiple_zeroconf_catcher",
+        side_effect=lambda zc: None,
+    ):
+        yield
 
 
 @pytest.fixture(autouse=True)