code: def testReservoirX(self):
      sample = [
          0,
          1,
          2,
          3,
          4,
          5,
          6,
          7,
          8,
          9,
          10,
          11,
          12,
          13,
          14,
          15,
          16,
          17,
          18,
          19,
          20,
      ]
      sampling_test_template.random_sampling(
          sample, 10, reservoir_x, 10
      )
  
file_path: pyclustering/pyclustering/utils/tests/unit/ut_sampling.py
imports: import unittest
  import matplotlib
  from pyclustering.utils.tests.sampling_templates import sampling_test_template
  from pyclustering.utils.sampling import reservoir_x, reservoir_r
label_desc: Use image node_id 5 for calling the sampling_unit_test obj's underlying member method code with example usage: obj.testReservoirX() without return types