code: def test_tqdm_keys(self):
      state = {
          torchbearer.EPOCH: 1,
          torchbearer.MAX_EPOCHS: 10,
          torchbearer.HISTORY: [0, {"test": 0.99456}],
          torchbearer.METRICS: {"test": 0.99456},
      }
      tqdm = Tqdm(validation_label_letter="e", on_epoch=True)
      tqdm.tqdm_module = MagicMock()
  
      tqdm.on_start(state)
  
file_path: torchbearer/tests/callbacks/test_printer.py
imports: from unittest import TestCase
  from mock import patch, MagicMock
  import torchbearer
  from torchbearer.callbacks import Tqdm, ConsolePrinter
label_desc: Use image node_id 4 for calling the TestTqdm obj's underlying member method code with example usage: obj.test_tqdm_keys() without return types