docstr: Tests that a no-arg call leaves shapes unchanged.
docstr_tok: ["Tests","that","a","no-arg","call","leaves","shapes","unchanged","."]
code: def test_truncate_to_length_no_arg(self):
      """Tests that a no-arg call leaves shapes unchanged."""
  
      def data_stream():
          while True:
              yield (np.zeros((1, 5)), np.ones((1, 5)))
  
      stream_fn = data.inputs.TruncateToLength()
      y0, y1 = next(stream_fn(data_stream()))
      self.assertEqual(y0.shape, (1, 5))
      self.assertEqual(y1.shape, (1, 5))
  
imports: import itertools
  import os
  from absl.testing import absltest
  from absl.testing import parameterized
  import numpy
  from trax import data
label_desc: Use image node_id 24 for calling the InputsTest obj's underlying member method code with example usage: obj.test_truncate_to_length_no_arg() without return types