code: def testStructuredData(self):
      data = {
          "a": [1, 2, 3, 4, 5],
          "b": ([b"a", b"b", b"c", b"d", b"e"], [-1, -2, -3, -4, -5]),
      }
      data_len = len(data["a"])
      target = 12
      ds = dataset_ops.Dataset.from_tensor_slices(data)
      ds = ds.apply(pad_to_cardinality(target))
      expected_data = [
          {
              "a": data["a"][i],
              "b": (data["b"][0][i], data["b"][1][i]),
              "valid": True,
          }
          for i in range(data_len)
      ]
      expected_padding = [
          {"a": 0, "b": (b"", 0), "valid": False}
          for _ in range(target - data_len)
      ]
      self.assertAllEqual(
          self.getDatasetOutput(ds), expected_data + expected_padding
      )
  
file_path: tensorflow-upstream/tensorflow/python/data/experimental/kernel_tests/pad_to_cardinality_test.py
imports: from absl.testing import parameterized
  from tensorflow.python.data.experimental.ops import pad_to_cardinality
  from tensorflow.python.data.kernel_tests import test_base
  from tensorflow.python.data.ops import dataset_ops
  from tensorflow.python.framework import combinations
  from tensorflow.python.platform import test
label_desc: Use image node_id 3 for calling the PadToCardinalityTest obj's underlying member method code with example usage: obj.testStructuredData() without return types