code: def testMoreThan255Fields(self):
      num_fields = 1000
      t = structural_tuple.structtuple(
          ["field{}".format(n) for n in range(num_fields)]
      )
      self.assertLen(t._fields, num_fields)
  
imports: import tensorflow.compat.v2
  from tensorflow_probability.python.internal import nest_util
  from tensorflow_probability.python.internal import structural_tuple
  from tensorflow_probability.python.internal import test_util
  from tensorflow.python.util import nest
label_desc: Use image node_id 7 for calling the StructTupleTest obj's underlying member method code with example usage: obj.testMoreThan255Fields() without return types