code: def test_normalize_timestamp(self):
      timestamp = 1591161115.194556
      millisecond_timestamp = 1591161115194
      microsecond_timestamp = 1591161115194556
  
      assert util.normalize_timestamp(timestamp) == timestamp
      assert (
          util.normalize_timestamp(millisecond_timestamp)
          == 1591161115.194
      )
      assert (
          util.normalize_timestamp(microsecond_timestamp)
          == 1591161115.194556
      )
  
      with pytest.raises(ValueError):
          util.normalize_timestamp(3e17)
  
file_path: arrow-py/tests/test_util.py
imports: import time
  from datetime import datetime
  import pytest
  from arrow import util
label_desc: Use image node_id 4 for calling the TestUtil obj's underlying member method code with example usage: obj.test_normalize_timestamp() without return types