class_docstr: Tests for the finite_diff_coeffs function
class_docstr_tok: ["Tests","for","the","finite_diff_coeffs","function"]
docstr: Test that an error is raised if the strategy is not recognized
code: def test_invalid_strategy(self):
      """Test that an error is raised if the strategy is not recognized"""
      with pytest.raises(ValueError, match="Unknown strategy"):
          finite_diff_coeffs(1, 1, 1)
  
imports: import numpy
  import pytest
  import pennylane
  from pennylane import numpy
  from pennylane.devices import DefaultQubitLegacy
  from pennylane.gradients import finite_diff, finite_diff_coeffs
  from pennylane.operation import AnyWires, Observable
label_desc: Use image node_id 3 for calling the TestCoeffs obj's underlying member method code with example usage: obj.test_invalid_strategy() without return types