Fix tests and add setup type in feedreader (#64280)

* Fix feedreader tests

* Cleanup

* Add setup type hints

Co-authored-by: epenet <epenet@users.noreply.github.com>

tests/components/feedreader/test_init.py

@@ -1,9 +1,7 @@
 """The tests for the feedreader component."""
 from datetime import timedelta
-from os import remove
-from os.path import exists
 from unittest import mock
-from unittest.mock import patch
+from unittest.mock import mock_open, patch
 
 import pytest
 
@@ -65,14 +63,10 @@ async def fixture_events(hass):
 
 
 @pytest.fixture(name="feed_storage", autouse=True)
-def fixture_feed_storage(hass):
-    """Create storage account for feedreader."""
-    data_file = hass.config.path(f"{feedreader.DOMAIN}.pickle")
-
-    yield
-
-    if exists(data_file):
-        remove(data_file)
+def fixture_feed_storage():
+    """Mock builtins.open for feedreader storage."""
+    with patch("homeassistant.components.feedreader.open", mock_open(), create=True):
+        yield
 
 
 async def test_setup_one_feed(hass):