code: def test_constant_schedule():
      schedule = ConstantSchedule(0.3)
  
      # make sure the values in the constant schedule don't change over time
      for i in range(1000):
          assert schedule.initial_value == 0.3
          assert schedule.current_value == 0.3
          schedule.step()
  
file_path: coach/rl_coach/tests/test_schedules.py
imports: import os
  import sys
  from rl_coach.core_types import EnvironmentSteps
  import pytest
  from rl_coach.schedules import LinearSchedule, ConstantSchedule, ExponentialSchedule, PieceWiseSchedule
  import numpy
label_desc: Use image node_id 1 for calling a global function with example usage: test_constant_schedule() without return types