class_docstr: Tests for the qfunc_transform decorator
class_docstr_tok: ["Tests","for","the","qfunc_transform","decorator"]
docstr: Test that an error is raised if the transform
  is applied to an invalid function
docstr_tok: ["Test","that","an","error","is","raised","if","the","transform","is","applied","to","an","invalid","function"]
code: def test_error_invalid_qfunc(self):
      """Test that an error is raised if the transform
      is applied to an invalid function"""
  
      def identity_transform(tape):
          for op in tape:
              op.queue()
  
      my_transform = qml.qfunc_transform(identity_transform)
  
      with pytest.raises(
          ValueError,
          match="does not appear to be a valid Python function",
      ):
          my_transform(5)
  
imports: import pytest
  import pennylane
  from pennylane import numpy
label_desc: Use image node_id 3 for calling the TestQFuncTransforms obj's underlying member method code with example usage: obj.test_error_invalid_qfunc() without return types