code: def test_handful_to_ch(self):
      cases = [
          (0.8699908, 10.0, 465.4956, 3.997799075635331),
          (0.8559087, 43.0, 211.7474, 5.1348419692951675),
          (0.6019187, 11.0, 386.5556, 3.3383101487698821),
          (0.658888, 51.0, 74.652, 4.8108880483153733),
          (0.6183604, 77.0, 479.8493, 4.9864059321732874),
          (0.9238978, 77.0, 787.5278, 5.7871053003022936),
          (0.8408322, 7.0, 227.3483, 3.5555798311413578),
          (0.5930279, 60.0, 325.3461, 4.7658023123882396),
          (0.6236158, 61.0, 657.5285, 4.8207812755987867),
          (0.9344575, 72.0, 846.4138, 5.8014341329259107),
          (0.8761198, 56.0, 677.8171, 5.362460718311719),
          (0.7901517, 41.0, 131.525, 4.9222831341950544),
          (0.6396423, 44.0, 624.3828, 4.6015127250083152),
          (0.8085966, 14.0, 251.4224, 4.0793058424719746),
          (0.716179, 45.0, 136.7055, 4.8055498089340087),
          (0.8204, 6.0, 290.9876, 3.3158771384085597),
          (0.8705345, 83.0, 759.6216, 5.5969334564485376),
          (0.8249085, 18.0, 661.9321, 4.3283725986180395),
          (0.9503, 2.0, 4.434, 3.7871158594867262),
          (0.7276132, 95.0, 91.43983, 5.4100384868499889),
      ]
  
      for p, r, v, q in cases:
          assert_almost_equal(q, qsturng(p, r, v), 5)
  
imports: from statsmodels.compat.python import lzip, lmap
  from numpy.testing import assert_equal, assert_almost_equal, assert_array_almost_equal, assert_raises
  import numpy
  import pytest
  from statsmodels.stats.libqsturng import qsturng, psturng
label_desc: Use image node_id 6 for calling the TestQsturng obj's underlying member method code with example usage: obj.test_handful_to_ch() without return types