class_docstr: Tests for the PauliGroupingStrategy class
class_docstr_tok: ["Tests","for","the","PauliGroupingStrategy","class"]
docstr: Tests ValueError is raised if specified grouping_type is not recognized.
docstr_tok: ["Tests","ValueError","is","raised","if","specified","grouping_type","is","not","recognized","."]
code: def test_initialize_with_invalid_grouping(self):
      """Tests ValueError is raised if specified grouping_type is not recognized."""
  
      observables = [PauliX(0) @ PauliY(2), PauliZ(2)]
  
      assert pytest.raises(
          ValueError,
          PauliGroupingStrategy,
          observables,
          grouping_type="invalid",
      )
  
imports: import pytest
  import numpy
  import pennylane
  from pennylane import Identity, PauliX, PauliY, PauliZ
  from pennylane.pauli import are_identical_pauli_words
  from pennylane.pauli.grouping.group_observables import PauliGroupingStrategy, group_observables
  from pennylane import numpy
label_desc: Use image node_id 1 for calling the TestPauliGroupingStrategy obj's underlying member method code with example usage: obj.test_initialize_with_invalid_grouping() without return types