code: def test_empty_data(self):
      beta0 = [0.02, 0.0]
      linear = Model(self.empty_data_func)
  
      empty_dat = Data([], [])
      assert_warns(OdrWarning, ODR, empty_dat, linear, beta0=beta0)
  
      empty_dat = RealData([], [])
      assert_warns(OdrWarning, ODR, empty_dat, linear, beta0=beta0)
  
imports: import tempfile
  import shutil
  import os
  import numpy
  from numpy import pi
  from numpy.testing import assert_array_almost_equal, assert_equal, assert_warns
  import pytest
  from pytest import raises
  from scipy.odr import Data, Model, ODR, RealData, OdrStop, OdrWarning, multilinear, exponential, unilinear, quadratic, polynomial
label_desc: Use image node_id 3 for calling the TestODR obj's underlying member method code with example usage: obj.test_empty_data() without return types