docstr: Test that storage.get() always returns CacheStorageKeyNotFoundError.
docstr_tok: ["Test","that","storage.get","(",")","always","returns","CacheStorageKeyNotFoundError","."]
code: def test_dummy_storage_get_always_not_found(self):
      """Test that storage.get() always returns CacheStorageKeyNotFoundError."""
  
      with self.assertRaises(CacheStorageKeyNotFoundError):
          self.storage.get("some-key")
  
      self.storage.set("some-key", b"some-value")
  
      with self.assertRaises(CacheStorageKeyNotFoundError):
          self.storage.get("some-key")
  
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 2 for calling the DummyCacheStorageTest obj's underlying member method code with example usage: obj.test_dummy_storage_get_always_not_found() without return types