Clean up translations for mocked integrations inbetween tests

tests/common.py

@@ -1867,23 +1867,6 @@ async def snapshot_platform(
         assert state == snapshot(name=f"{entity_entry.entity_id}-state")
 
 
-def reset_translation_cache(hass: HomeAssistant, components: list[str]) -> None:
-    """Reset translation cache for specified components.
-
-    Use this if you are mocking a core component (for example via
-    mock_integration), to ensure that the mocked translations are not
-    persisted in the shared session cache.
-    """
-    translations_cache = translation._async_get_translations_cache(hass)
-    for loaded_components in translations_cache.cache_data.loaded.values():
-        for component_to_unload in components:
-            loaded_components.discard(component_to_unload)
-    for loaded_categories in translations_cache.cache_data.cache.values():
-        for loaded_components in loaded_categories.values():
-            for component_to_unload in components:
-                loaded_components.pop(component_to_unload, None)
-
-
 @lru_cache
 def get_quality_scale(integration: str) -> dict[str, QualityScaleStatus]:
     """Load quality scale for integration."""

tests/components/stt/test_init.py

@@ -34,7 +34,6 @@ from tests.common import (
     mock_integration,
     mock_platform,
     mock_restore_cache,
-    reset_translation_cache,
 )
 from tests.typing import ClientSessionGenerator, WebSocketGenerator
 
@@ -519,9 +518,6 @@ async def test_default_engine_prefer_cloud_entity(
     assert provider_engine.name == "test"
     assert async_default_engine(hass) == "stt.cloud_stt_entity"
 
-    # Reset the `cloud` translations cache to avoid flaky translation checks
-    reset_translation_cache(hass, ["cloud"])
-
 
 async def test_get_engine_legacy(
     hass: HomeAssistant, tmp_path: Path, mock_provider: MockSTTProvider

tests/components/tts/test_init.py

@@ -44,7 +44,6 @@ from tests.common import (
     mock_integration,
     mock_platform,
     mock_restore_cache,
-    reset_translation_cache,
 )
 from tests.typing import ClientSessionGenerator, WebSocketGenerator
 
@@ -1987,6 +1986,3 @@ async def test_default_engine_prefer_cloud_entity(
     provider_engine = tts.async_resolve_engine(hass, "test")
     assert provider_engine == "test"
     assert tts.async_default_engine(hass) == "tts.cloud_tts_entity"
-
-    # Reset the `cloud` translations cache to avoid flaky translation checks
-    reset_translation_cache(hass, ["cloud"])

tests/conftest.py

@@ -85,6 +85,7 @@ from homeassistant.helpers import (
     issue_registry as ir,
     label_registry as lr,
     recorder as recorder_helper,
+    translation as translation_helper,
 )
 from homeassistant.helpers.dispatcher import async_dispatcher_send
 from homeassistant.helpers.translation import _TranslationsCacheData
@@ -1232,11 +1233,10 @@ def mock_get_source_ip() -> Generator[_patch]:
 
 @pytest.fixture(autouse=True, scope="session")
 def translations_once() -> Generator[_patch]:
-    """Only load translations once per session.
+    """Only load translations once per module.
 
-    Warning: having this as a session fixture can cause issues with tests that
+    Note: To avoid issues with tests that mock integrations, translations for
-    create mock integrations, overriding the real integration translations
+    mocked integrations are cleaned up by the evict_faked_translations fixture.
-    with empty ones. Translations should be reset after such tests (see #131628)
     """
     cache = _TranslationsCacheData({}, {})
     patcher = patch(
@@ -1250,6 +1250,27 @@ def translations_once() -> Generator[_patch]:
         patcher.stop()
 
 
+@pytest.fixture(autouse=True, scope="module")
+def evict_faked_translations(translations_once) -> Generator[_patch]:
+    """Clear translations for mocked integrations from the cache after each module."""
+    real_component_strings = translation_helper._async_get_component_strings
+    with patch(
+        "homeassistant.helpers.translation._async_get_component_strings",
+        wraps=real_component_strings,
+    ) as mock_component_strings:
+        yield
+    cache: _TranslationsCacheData = translations_once.kwargs["return_value"]
+    for call in mock_component_strings.mock_calls:
+        integrations: dict[str, loader.Integration] = call.args[3]
+        for domain, integration in integrations.items():
+            if str(integration.file_path).endswith(
+                f"homeassistant/components/{domain}"
+            ):
+                continue
+            cache.loaded["en"].discard(domain)
+            cache.cache["en"].pop(domain, None)
+
+
 @pytest.fixture
 def disable_translations_once(
     translations_once: _patch,