code: def test_eval_batch_sampler(self):
      eval_iterator = EvalBatchSampler().batchify(self.iter_dict)
      expected_items = ["1", "2", "3", "4", "5", "a", "b", "c"]
      self._check_iterator(eval_iterator, expected_items)
  
file_path: pytext/pytext/data/test/batch_sampler_test.py
imports: import unittest
  from pytext.data import AlternatingRandomizedBatchSampler, EvalBatchSampler, RandomizedBatchSampler, RoundRobinBatchSampler
label_desc: Use image node_id 3 for calling the BatchSamplerTest obj's underlying member method code with example usage: obj.test_eval_batch_sampler() without return types