class_docstr: Tests the helper functions for classical pre-processsing.
class_docstr_tok: ["Tests","the","helper","functions","for","classical","pre-processsing","."]
docstr: Test the _get_alpha_y helper function.
docstr_tok: ["Test","the","_get_alpha_y","helper","function","."]
code: def test_get_alpha_y(self, current_qubit, expected, tol):
      """Test the _get_alpha_y helper function."""
  
      state = np.array(
          [
              np.sqrt(0.2),
              0,
              np.sqrt(0.5),
              0,
              0,
              0,
              np.sqrt(0.2),
              np.sqrt(0.1),
          ]
      )
      res = _get_alpha_y(state, 3, current_qubit)
      assert np.allclose(res, expected, atol=tol)
  
imports: import pytest
  import numpy
  import pennylane
  from pennylane import numpy
  from pennylane.templates.state_preparations.mottonen import gray_code, _get_alpha_y
label_desc: Use image node_id 2 for calling the TestHelpers obj's underlying member method code with example usage: obj.test_get_alpha_y(current_qubit, expected, tol) without return types