code: def test_nu_to_lambda():
      assert_equal(
          sc.nu2lambda([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 3 for calling a global function with example usage: test_nu_to_lambda() without return types