code: def test_add_points_batch2(self):
      self.assertRaises(
          ValueError,
          nmslib.addDataPointBatch,
          self.index,
          np.array([0, 1, 2]),
          ["string1", "string2", "string3"],
      )
  
imports: import unittest
  import numpy.testing
  import os
  import numpy
  import nmslib
label_desc: Use image node_id 4 for calling the StringTests2 obj's underlying member method code with example usage: obj.test_add_points_batch2() without return types