code: def testSleeper_SleepUntil(self):
      # Burn in.
      for _ in range(10):
          concurrency.Sleeper().sleep(0.01)
  
      future_time = time.time() + 0.5
      concurrency.Sleeper().sleep_until(future_time)
      self.assertAlmostEqual(time.time(), future_time, delta=0.005)
  
file_path: magenta/magenta/common/concurrency_test.py
imports: import threading
  import time
  from magenta.common import concurrency
  import tensorflow.compat.v1
label_desc: Use image node_id 1 for calling the ConcurrencyTest obj's underlying member method code with example usage: obj.testSleeper_SleepUntil() without return types