code: def test_get_time_since_start(self):
      timer = Timer()
      time.sleep(2)
      expected = 2
  
      self.assertEqual(
          expected, int(timer.get_time_since_start().split("s")[0])
      )
  
imports: import time
  import unittest
  from mmf.utils.timer import Timer
label_desc: Use image node_id 3 for calling the TestUtilsTimer obj's underlying member method code with example usage: obj.test_get_time_since_start() without return types