class_docstr: Tests the _preprocess_expand_fn helper function.
class_docstr_tok: ["Tests","the","_preprocess_expand_fn","helper","function","."]
docstr: Test that if the expand_fn is not "device", it is simply returned.
docstr_tok: ["Test","that","if","the","expand_fn","is","not","``","device","''",",","it","is","simply","returned","."]
code: def test_provided_is_callable(self):
      """Test that if the expand_fn is not "device", it is simply returned."""
  
      dev = DefaultQubit()
  
      def f(tape):
          return tape
  
      out = _preprocess_expand_fn(f, dev, 10)
      assert out is f
  
file_path: pennylane/tests/interfaces/default_qubit_2_integration/test_execute_default_qubit_2.py
imports: import pytest
  import pennylane
  from pennylane import numpy
  from pennylane.workflow.execution import _preprocess_expand_fn
  from pennylane.devices import DefaultQubit
label_desc: Use image node_id 1 for calling the TestPreprocessExpandFn obj's underlying member method code with example usage: obj.test_provided_is_callable() and returns: tape