code: def test_serializable(orion_db):
      serialized = pickle.dumps(orion_db)
      deserialized = pickle.loads(serialized)
      assert len(orion_db.read("test_collection", {})) > 0
      assert orion_db.read("test_collection", {}) == deserialized.read(
          "test_collection", {}
      )
  
imports: import pickle
  from datetime import datetime
  import pytest
  from orion.core.io.database import Database, DatabaseError, DuplicateKeyError
  from orion.core.io.database.ephemeraldb import EphemeralDB
  from orion.core.io.database.mongodb import MongoDB
  from orion.core.io.database.pickleddb import PickledDB
  from .conftest import insert_test_collection
label_desc: Use image node_id 3 for calling a global function with example usage: test_serializable(orion_db) without return types