diff --git a/tests/components/diagnostics/__init__.py b/tests/components/diagnostics/__init__.py
index 81d62e7c2fe..d241ca09f41 100644
--- a/tests/components/diagnostics/__init__.py
+++ b/tests/components/diagnostics/__init__.py
@@ -19,6 +19,7 @@ async def _get_diagnostics_for_config_entry(
 ) -> JsonObjectType:
     """Return the diagnostics config entry for the specified domain."""
     assert await async_setup_component(hass, "diagnostics", {})
+    await hass.async_block_till_done()
 
     client = await hass_client()
     response = await client.get(