code: def test_identity_basics(self, sparse):
      if sparse and not backend.SUPPORTS_SPARSE_TENSORS:
          pytest.skip("Backend does not support sparse tensors.")
      self.run_layer_test(
          layers.Identity,
          init_kwargs={},
          input_shape=(2, 3),
          input_sparse=sparse,
          expected_output_shape=(2, 3),
          expected_output_sparse=sparse,
          expected_num_trainable_weights=0,
          expected_num_non_trainable_weights=0,
          expected_num_seed_generators=0,
          expected_num_losses=0,
          run_training_check=not sparse,
          supports_masking=True,
      )
  
file_path: keras/keras/layers/core/identity_test.py
imports: import pytest
  from absl.testing import parameterized
  from keras import backend
  from keras import layers
  from keras import testing
label_desc: Use image node_id 1 for calling the IdentityTest obj's underlying member method code with example usage: obj.test_identity_basics(sparse) without return types