code: def test_insert(self):
      modification_date = datetime.datetime.now().strftime(
          "%Y%m%d_%H%M%S%f"
      )
  
      self.sut.insert(
          Path(f"{self.tempDir.name}/test23.file"),
          "test_hash",
          modification_date,
      )
      returned = self.sut.fetch_one(
          Path(f"{self.tempDir.name}/test23.file")
      )
  
      self.assertEqual(returned.file_hash, "test_hash")
      self.assertEqual(returned.modification_date, modification_date)
  
file_path: neptune-client/tests/unit/neptune/new/internal/artifacts/test_local_file_hash_storage.py
imports: import datetime
  import tempfile
  import unittest
  from pathlib import Path
  from mock import patch
  from neptune.internal.artifacts.local_file_hash_storage import LocalFileHashStorage
label_desc: Use image node_id 6 for calling the TestLocalFileHashStorage obj's underlying member method code with example usage: obj.test_insert() without return types