code: def test_lagzero(self):
      assert_equal(lag.lagzero, [0])
  
imports: from functools import reduce
  import numpy
  import numpy.polynomial.laguerre
  from numpy.polynomial.polynomial import polyval
  from numpy.testing import assert_almost_equal, assert_raises, assert_equal, assert_
label_desc: Use image node_id 2 for calling the TestConstants obj's underlying member method code with example usage: obj.test_lagzero() without return types