code: def test_nearest(self):
      result = self.nearest_filter.filter_vectors(self.V)
      self.assertEqual(len(result), 5)
      self.assertIn(self.V[0], result)
      self.assertIn(self.V[1], result)
      self.assertIn(self.V[4], result)
      self.assertIn(self.V[2], result)
      self.assertIn(self.V[3], result)
  
file_path: NearPy/tests/filters_tests.py
imports: import numpy
  import unittest
  from nearpy.filters import NearestFilter, DistanceThresholdFilter, UniqueFilter
label_desc: Use image node_id 3 for calling the TestVectorFilters obj's underlying member method code with example usage: obj.test_nearest() without return types