code: def test_batch_count(self):
      sampler = MaxTokensBatchSampler(
          max_tokens=8, padding_noise=0, sorting_keys=["text"]
      )
      data_loader = MultiProcessDataLoader(
          self.get_mock_reader(), "fake_path", batch_sampler=sampler
      )
      assert len(data_loader) == 3
  
file_path: allennlp/tests/data/samplers/max_tokens_batch_sampler_test.py
imports: from allennlp.data import Instance, Token
  from allennlp.data.fields import TextField
  from allennlp.data.samplers import MaxTokensBatchSampler
  from allennlp.data.data_loaders import MultiProcessDataLoader
  from .sampler_test import SamplerTest
label_desc: Use image node_id 3 for calling the TestMaxTokensSampler obj's underlying member method code with example usage: obj.test_batch_count() without return types