Only load translations for an integration once per test session (#117118)

tests/conftest.py

@@ -1165,6 +1165,31 @@ def mock_get_source_ip() -> Generator[patch, None, None]:
         patcher.stop()
 
 
+@pytest.fixture(autouse=True, scope="session")
+def translations_once() -> Generator[patch, None, None]:
+    """Only load translations once per session."""
+    from homeassistant.helpers.translation import _TranslationsCacheData
+
+    cache = _TranslationsCacheData({}, {})
+    patcher = patch(
+        "homeassistant.helpers.translation._TranslationsCacheData",
+        return_value=cache,
+    )
+    patcher.start()
+    try:
+        yield patcher
+    finally:
+        patcher.stop()
+
+
+@pytest.fixture
+def disable_translations_once(translations_once):
+    """Override loading translations once."""
+    translations_once.stop()
+    yield
+    translations_once.start()
+
+
 @pytest.fixture
 def mock_zeroconf() -> Generator[None, None, None]:
     """Mock zeroconf."""