code: def test_simple_assign_and_fetch(
      self, container: MetadataContainer, value
  ):
      key = self.gen_key()
  
      container[key] = value
      container.sync()
      assert container[key].fetch() == value
  
imports: import random
  from datetime import datetime, timezone
  import pytest
  from neptune.metadata_containers import MetadataContainer
  from tests.e2e.base import AVAILABLE_CONTAINERS, BaseE2ETest, fake
label_desc: Use image node_id 1 for calling the TestAtoms obj's underlying member method code with example usage: obj.test_simple_assign_and_fetch(container, value) without return types