code: def test_worker_type(self):
      ds = DS0()
      for worker_type in ["thread", "process"]:
          loader = elegy.data.DataLoader(
              ds, batch_size=4, n_workers=4, worker_type=worker_type
          )
          batches = list(loader)
  
imports: from unittest import TestCase
  import jax.numpy
  import numpy
  import optax
  import pytest
  import elegy
label_desc: Use image node_id 7 for calling the DataLoaderTestCase obj's underlying member method code with example usage: obj.test_worker_type() without return types