code: def test_lambda_to_nu():
      assert_equal(
          sc.lambda2nu([sc.speed_of_light, 1]), [1, sc.speed_of_light]
      )
  
imports: from numpy.testing import assert_equal, assert_allclose
  import scipy.constants
label_desc: Use image node_id 2 for calling a global function with example usage: test_lambda_to_nu() without return types