  from nose.tools import assert_equal
  
  
  class TestDfs(object):
  
      def __init__(self):
          self.results = Results()
  
      def test_dfs(self):
 
</s>
class TestDfs(unittest.TestCase):
  from nose.tools import assert_equal
  
  
class TestDfs(unittest.TestCase):
  
      def __init__(self):
          self.results = Results()
  
      def test_dfs(self):
keep keep keep replace keep keep keep keep keep
 #273: Remove nose dependency for graphs_trees/ (#277)
graphs_trees/tree_dfs/test_dfs.py