diff --git a/aiogram/dispatcher/storage/exceptions.py b/aiogram/dispatcher/storage/exceptions.py
deleted file mode 100644
index 6f9ffc59..00000000
--- a/aiogram/dispatcher/storage/exceptions.py
+++ /dev/null
@@ -1,3 +0,0 @@
-# todo
-class FSMStorageBaseError(Exception):
-    pass
diff --git a/tests/test_dispatcher/test_storage/__init__.py b/tests/test_dispatcher/test_storage/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/tests/test_dispatcher/test_storage/test_dummy.py b/tests/test_dispatcher/test_storage/test_dummy.py
new file mode 100644
index 00000000..f8baadd2
--- /dev/null
+++ b/tests/test_dispatcher/test_storage/test_dummy.py
@@ -0,0 +1,50 @@
+import pytest
+
+from aiogram.dispatcher.storage.dummy import DummyStorage
+
+KFULL_DUMMY_METHODS = {
+    "finish",
+    "get_data",
+    "get_state",
+    "reset_data",
+    "reset_state",
+    "set_data",
+    "set_state",
+    "update_data",
+    # close and wait_closed do not require key
+}
+
+
+WARNING_MESSAGE = (
+    "You haven’t set any storage yet so no states and no data will be saved. \n"
+    "You can connect MemoryStorage for debug purposes or non-essential data."
+)
+
+
+@pytest.fixture()
+def dummy_store():
+    return DummyStorage()
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize("dummy_method", KFULL_DUMMY_METHODS)
+async def test_dummy_storage_warnings(dummy_method: str, dummy_store: DummyStorage):
+    with pytest.warns(
+        Warning, match=WARNING_MESSAGE,
+    ):
+        if dummy_method.startswith("get_") or dummy_method in {"finish", "reset_data"}:
+            assert await getattr(dummy_store, dummy_method)("42:20") is None
+        else:
+            assert await getattr(dummy_store, dummy_method)("42:20", None) is None
+
+
+@pytest.mark.asyncio
+async def test_dummy_storage_warnings_for_close(dummy_store: DummyStorage):
+    with pytest.warns(Warning, match=WARNING_MESSAGE):
+        await dummy_store.close()
+
+
+@pytest.mark.asyncio
+async def test_dummy_storage_warnings_for_wait_closed(dummy_store: DummyStorage):
+    with pytest.warns(Warning, match=WARNING_MESSAGE):
+        await dummy_store.wait_closed()