code: def setUp(self) -> None:
      self.image_id = f"spleen_99{self.rand_id}"
      self.image_file = f"{self.image_id}.nii.gz"
      time.sleep(1)
  
file_path: MONAILabel/tests/unit/endpoints/test_datastore.py
imports: import os
  import time
  import unittest
  from .context import BasicEndpointTestSuite
label_desc: Use image node_id 1 for calling the EndPointDatastore obj's underlying member method code with example usage: obj.setUp() without return types