class_docstr: Tests additional methods and attributes
docstr: Test that the shape function warns if there are not enough qubits.
docstr_tok: ["Test","that","the","shape","function","warns","if","there","are","not","enough","qubits","."]
code: def test_shape_exception_not_enough_qubits(self):
      """Test that the shape function warns if there are not enough qubits."""
  
      with pytest.raises(
          ValueError,
          match="The number of qubits must be greater than one",
      ):
          qml.ParticleConservingU2.shape(3, 1)
  
imports: import pytest
  import numpy
  import pennylane
  from pennylane import numpy
label_desc: Use image node_id 2 for calling the TestAttributes obj's underlying member method code with example usage: obj.test_shape_exception_not_enough_qubits() without return types