code: def test_step_scheduler(init_lr, max_iter, gamma, iter_steps):
      scheduler_tester(
          lrs.StepScheduler,
          RefStep,
          max_iter,
          [init_lr, gamma, iter_steps],
      )
  
file_path: nnabla/python/test/utils/learning_rate_scheduler/test_step_scheduler.py
imports: import pytest
  from learning_rate_scheduler_test_utils import scheduler_tester
  import nnabla.utils.learning_rate_scheduler
label_desc: Use image node_id 1 for calling a global function with example usage: test_step_scheduler(init_lr, max_iter, gamma, iter_steps) without return types