code: def setUp(self) -> None:
      super().setUp()
      self.context = CacheStorageContext(
          function_key="func-key",
          function_display_name="func-display-name",
          persist="disk",
      )
      self.dummy_cache_storage = DummyCacheStorage()
      self.storage_manager = MemoryCacheStorageManager()
      self.storage = self.storage_manager.create(self.context)
  
file_path: streamlit/lib/tests/streamlit/runtime/caching/storage/dummy_cache_storage_test.py
imports: import unittest
  from streamlit.runtime.caching.storage import CacheStorageContext, CacheStorageKeyNotFoundError
  from streamlit.runtime.caching.storage.dummy_cache_storage import DummyCacheStorage, MemoryCacheStorageManager
label_desc: Use image node_id 1 for calling the DummyCacheStorageManagerTest obj's underlying member method code with example usage: obj.setUp() without return types