new_contents: from unittest import TestCase
  
  import numpy as np
  
  import Orange
  
  
  class TestEqualFreq(TestCase):
      def test_equifreq(self):
          X = np.random.randint(0, 2, (100, 1))
          data = Orange.data.Table(X)
          disc = Orange.feature.discretization.EqualFreq(n=4)
          dvar = disc(data, data.domain.variables[0])
          self.assertEqual(len(dvar.values), 2)
  
subject: Add unit test.