class_docstr: Tests the _generalized_pauli_decompose via pauli_decompose function
docstr: Tests that the all identity operator remains even with hide_identity = True.
docstr_tok: ["Tests","that","the","all","identity","operator","remains","even","with","hide_identity","=","True","."]
code: def test_hide_identity_true_all_identities(self):
      """Tests that the all identity operator remains even with hide_identity = True."""
      H = np.eye(4)
      _, obs_list = qml.pauli_decompose(
          H, hide_identity=True, check_hermitian=False
      ).terms()
      tensors = filter(lambda obs: isinstance(obs, Tensor), obs_list)
  
      for tensor in tensors:
          assert all(isinstance(o, Identity) for o in tensor.obs)
  
imports: import pytest
  import numpy
  import pennylane
  from pennylane.operation import Tensor
  from pennylane.ops import Identity, PauliX, PauliY, PauliZ
  from pennylane.pauli import pauli_sentence, PauliWord, PauliSentence
  from pennylane.pauli.conversion import _generalized_pauli_decompose
label_desc: Use image node_id 4 for calling the TestPhasedDecomposition obj's underlying member method code with example usage: obj.test_hide_identity_true_all_identities() without return types