code: def test_hash_ecfp(self):
      for power in (2, 16, 64):
          for _ in range(10):
              string = random_string(10)
              string_hash = hash_utils.hash_ecfp(string, power)
              self.assertIsInstance(string_hash, int)
              self.assertLess(string_hash, 2**power)
              self.assertGreaterEqual(string_hash, 0)
  
file_path: deepchem/deepchem/utils/test/test_hash_utils.py
imports: import unittest
  import numpy
  from deepchem.utils import hash_utils
label_desc: Use image node_id 1 for calling the TestHashUtils obj's underlying member method code with example usage: obj.test_hash_ecfp() without return types