diff --git a/tests/entity_stublib.py b/tests/entity_stublib.py
index 4790c9c..7c795ce 100644
--- a/tests/entity_stublib.py
+++ b/tests/entity_stublib.py
@@ -131,8 +131,38 @@ def install() -> None:
 
     config_entries = types.ModuleType("homeassistant.config_entries")
     config_entries.ConfigEntry = type("ConfigEntry", (), {})
+    async def _stub_set_unique_id(self, unique_id):
+        # hub shape: record; a full flow test file scopes its own version
+        self._unique_id = unique_id
+
+    def _noop_abort(self, *, error=None, **kwargs):
+        return None
+
     class _ConfigFlowStub:
-        """ConfigFlow shape used by flow tests (t29 G3a API included)."""
+        """ConfigFlow shape used by entity tests (t29 G3a API included).
+
+        Late loads under the hub stubs (e.g. test_init designs run AFTER the
+        other flow files) still get the base plumbing the flow modules rely
+        on — show/create/abort/unique-id — so the flow classes never import
+        against a bare base.
+        """
+
+        async_set_unique_id = _stub_set_unique_id
+        _abort_if_unique_id_configured = _noop_abort
+
+        def async_show_form(self, *, step_id, data_schema=None, errors=None):
+            return {
+                "type": "form",
+                "step_id": step_id,
+                "errors": dict(errors or {}),
+                "data_schema": data_schema,
+            }
+
+        def async_create_entry(self, *, title, data, options=None):
+            return {"type": "create_entry", "title": title, "data": data}
+
+        def async_abort(self, *, reason):
+            return {"type": "abort", "reason": reason}
 
         def _get_reauth_entry(self, entry=None):
             if entry is not None:
diff --git a/tests/test_standalone_setup.py b/tests/test_standalone_setup.py
index 728b953..1609e66 100644
--- a/tests/test_standalone_setup.py
+++ b/tests/test_standalone_setup.py
@@ -37,8 +37,15 @@ _STUB_NAMES = (
 
 
 def _install_stubs() -> None:
-    """Import-time stand-ins (idempotent; same shape as the pairing tests)."""
-    if sys.modules.get("voluptuous") is not None:
+    """Import-time stand-ins (idempotent; same shape as the pairing tests).
+
+    t30: the guard rebuilds whenever the module-level holder is missing —
+    a later file's scoped teardown may pop the shared stubs this file's
+    tests rely on (the flow-class surfaces live on the local base which we
+    MUST rebind against)."""
+    if sys.modules.get("voluptuous") is not None and hasattr(
+        sys.modules.get(__name__), "_zc_holder"
+    ):
         return
 
     vol = types.ModuleType("voluptuous")