Update template/test_light.py to use pytest (#56300)

tests/components/template/conftest.py

@@ -1,4 +1,6 @@
 """template conftest."""
+import json
+
 import pytest
 
 from homeassistant.setup import async_setup_component
@@ -13,8 +15,18 @@ def calls(hass):
 
 
 @pytest.fixture
-async def start_ha(hass, count, domain, config, caplog):
+def config_addon():
+    """Add entra configuration items."""
+    return None
+
+
+@pytest.fixture
+async def start_ha(hass, count, domain, config_addon, config, caplog):
     """Do setup of integration."""
+    if config_addon:
+        for key, value in config_addon.items():
+            config = config.replace(key, value)
+        config = json.loads(config)
     with assert_setup_component(count, domain):
         assert await async_setup_component(
             hass,