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 order < 1 or not an integer
code: def test_invalid_approx_order_error(self):
      """Test that an error is raised if order < 1 or not an integer"""
      with pytest.raises(
          ValueError, match="order must be a positive integer"
      ):
          finite_diff_coeffs(1, 0, 1)
  
      with pytest.raises(
          ValueError, match="order must be a positive integer"
      ):
          finite_diff_coeffs(1, 1.7, 1)
  
      with pytest.raises(
          ValueError,
          match="Centered finite-difference requires an even order",
      ):
          finite_diff_coeffs(1, 1, "center")
  
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 2 for calling the TestCoeffs obj's underlying member method code with example usage: obj.test_invalid_approx_order_error() without return types