code: def setup_method(self):
      super().setup_method()
      self.indexers = {"words": SingleIdTokenIndexer("words")}
      self.text = TextField(
          [
              Token(t)
              for t in [
                  "here",
                  "is",
                  "a",
                  "sentence",
                  "for",
                  "spans",
                  ".",
              ]
          ],
          self.indexers,
      )
  
file_path: allennlp/tests/data/fields/span_field_test.py
imports: import numpy
  import pytest
  from allennlp.common.testing import AllenNlpTestCase
  from allennlp.data import Token
  from allennlp.data.fields import TextField, SpanField
  from allennlp.data.token_indexers import SingleIdTokenIndexer
label_desc: Use image node_id 1 for calling the TestSpanField obj's underlying member method code with example usage: obj.setup_method() without return types