new_contents: import unittest
  
  from sklearn import datasets
  from rgf.sklearn import RGFClassifier
  
  
  class TestRGF(unittest.TestCase):
      def test_classifier(self):
          iris = datasets.load_iris()
          X, y = iris.data, iris.target
  
          rgf = RGFClassifier(max_leaf=400,
              algorithm="RGF_Sib",
              test_interval=100,
              n_iter=1)
  
          rgf.fit(X,y)
  
          
subject: add test