fix(tests): drop the speculative config-entries install guard — the scoped-stub teardowns already isolate per file; full suite green both variants (completes t30 G6)

tests/entity_stublib.py

@@ -113,12 +113,6 @@ def install() -> None:
     """Register the stub modules (idempotent)."""
     if "homeassistant.components.media_player" in sys.modules:
         return
-    # honor per-file flow stub versions already in place (e.g. the
-    # config-flow/pairing/protocol files) — the hub's base would strip the
-    # base plumbing the flow tests already installed (t30 leak).
-    ce = sys.modules.get("homeassistant.config_entries")
-    if ce is not None and hasattr(ce, "OptionsFlowWithReload"):
-        return
 
     vol = types.ModuleType("voluptuous")
     vol.Required = lambda key, default=None: key

tests/test_init.py

@@ -13,17 +13,45 @@ from types import SimpleNamespace
 import entity_stublib
 import pytest
 
+# Scoped-stub hygiene (mirrors tests/test_config_flow_pairing.py's
+# scoped_stubs pattern): the config-flow files install their own stub faces
+# and pop them per-test; test_init's runs must never leave a hub-stub set
+# behind that a later file's loader would bind against.
+_INIT_STUB_NAMES = (
+    "voluptuous",
+    "homeassistant",
+    "homeassistant.config_entries",
+    "homeassistant.core",
+    "homeassistant.helpers",
+    "homeassistant.helpers.entity_registry",
+    "homeassistant.helpers.device_registry",
+    "homeassistant.helpers.selector",
+    # the G8 lazy import in async_setup registers this platform module —
+    # without popping it the install() guard would skip the rebuild below
+    "homeassistant.components.media_player",
+    "nsh.helpers",
+    "nsh.config_flow",
+    "nsh.init",
+    "nsh.media_player",
+)
+
 
 @pytest.fixture(autouse=True)
 def _integration_module():
     """HA stubs + the integration __init__ module under nsh.init."""
+    snapshot = {name: sys.modules.get(name) for name in _INIT_STUB_NAMES}
     entity_stublib.install()
     if "nsh.init" not in sys.modules:
         import conftest
 
         conftest._load_module("nsh.init", conftest._SHIELD_DIR / "__init__.py")
     yield sys.modules["nsh.init"]
-    sys.modules.pop("nsh.init", None)
+    for name in _INIT_STUB_NAMES:
+        original = snapshot[name]
+        if original is None:
+            sys.modules.pop(name, None)
+        else:
+            sys.modules[name] = original
 
 
 class _SeedEntriesStub: