code: def test_002_add(self):
      with open(
          os.path.join(self.studies, "spleen_3.nii.gz"), "rb"
      ) as f:
          response = self.client.put(
              "/datastore/", files={"file": (self.image_file, f)}
          )
          assert response.status_code == 200
      assert (
          self.image_id
          in self.client.get("/datastore/?output=all").text
      )
      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 3 for calling the EndPointDatastore obj's underlying member method code with example usage: obj.test_002_add() without return types