code: def test_get_Keys():
      reporter = Reporter()
      reporter.set_epoch(1)
      key1 = uuid.uuid4().hex
      with reporter.observe(key1) as sub:
          stats1 = {"aa": 0.6}
          sub.register(stats1)
          sub.next()
      assert reporter.get_keys() == (key1,)
  
imports: import logging
  import uuid
  from pathlib import Path
  import numpy
  import pytest
  import torch
  from torch.utils.tensorboard import SummaryWriter
  from espnet2.train.reporter import Average, ReportedValue, Reporter, aggregate
label_desc: Use image node_id 11 for calling a global function with example usage: test_get_Keys() without return types