Replaced MockStorage with real ModuleStorage and added storage test suite.

tests/conftest.py

@@ -0,0 +1,29 @@
+# Copyright 2026 Logan Fick
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from typing import TYPE_CHECKING
+
+import pytest
+
+from owlbot.api.storage import ModuleStorage
+
+if TYPE_CHECKING:
+    from collections.abc import AsyncIterator
+    from pathlib import Path
+
+
+@pytest.fixture
+async def storage(tmp_path: Path) -> AsyncIterator[ModuleStorage]:
+    async with ModuleStorage(tmp_path, "test_module") as s:
+        yield s