code: def test_len_works_with_scalar(self):
      array = TensorField(numpy.asarray(42))
      assert len(array) == 1
  
file_path: allennlp/tests/data/fields/tensor_field_test.py
imports: import numpy
  import torch
  from allennlp.common.testing.test_case import AllenNlpTestCase
  from allennlp.data.fields import TensorField, ListField
label_desc: Use image node_id 9 for calling the TestTensorField obj's underlying member method code with example usage: obj.test_len_works_with_scalar() without return types