code: def test_medcouple_ties(self, reset_randomstate):
      x = np.array([1, 2, 2, 3, 4])
      mc = medcouple(x)
      assert_almost_equal(mc, 1.0 / 6.0)
  
imports: import numpy
  import pandas
  from numpy.testing import assert_almost_equal, assert_raises, assert_equal, assert_allclose
  from statsmodels.stats._adnorm import normal_ad
  from statsmodels.stats.stattools import omni_normtest, jarque_bera, durbin_watson, _medcouple_1d, medcouple, robust_kurtosis, robust_skewness
label_desc: Use image node_id 8 for calling the TestStattools obj's underlying member method code with example usage: obj.test_medcouple_ties(reset_randomstate) without return types