docstr: Test identity eigenvalues are correct
docstr_tok: ["Test","identity","eigenvalues","are","correct"]
code: def test_identity_eigvals(self, wires, tol):
      """Test identity eigenvalues are correct"""
      res = Identity(wires).eigvals()
      expected = np.ones(2 ** len(wires))
      assert np.allclose(res, expected, atol=tol, rtol=0)
  
file_path: pennylane/tests/ops/test_identity.py
imports: import numpy
  import pytest
  import pennylane
  from pennylane import Identity
label_desc: Use image node_id 3 for calling the TestIdentity obj's underlying member method code with example usage: obj.test_identity_eigvals(wires, tol) without return types