class_docstr: Test the construction of composite ops.
class_docstr_tok: ["Test","the","construction","of","composite","ops","."]
docstr: Test that initializing a composite operator with less than 2 operands raises a ValueError.
docstr_tok: ["Test","that","initializing","a","composite","operator","with","less","than","2","operands","raises","a","ValueError","."]
code: def test_raise_error_fewer_than_2_operands(self):
      """Test that initializing a composite operator with less than 2 operands raises a ValueError."""
      with pytest.raises(
          ValueError, match="Require at least two operators to combine;"
      ):
          _ = ValidOp(qml.PauliX(0))
  
imports: from copy import copy
  import numpy
  import pytest
  import pennylane
  from pennylane.operation import DecompositionUndefinedError
  from pennylane.ops.op_math import CompositeOp, Prod, Sum, SProd
  from pennylane.wires import Wires
label_desc: Use image node_id 2 for calling the TestConstruction obj's underlying member method code with example usage: obj.test_raise_error_fewer_than_2_operands() without return types