code: def test_latency_is_zero(self):
      self.assertEqual(-1, utils.get_throughput(0, 10))
  
file_path: nebuly/optimization/nebullvm/nebullvm/tools/tests/test_utils.py
imports: import unittest
  from unittest.mock import patch
  from nebullvm.core.models import DeviceType
  from nebullvm.tools import utils
label_desc: Use image node_id 1 for calling the TestGetThroughput obj's underlying member method code with example usage: obj.test_latency_is_zero() without return types