old_contents: import unittest
  import time
  
  class TestE(unittest.TestCase):
      def test_many_lines(self):
      	for i in xrange(100):
      		print 'Many lines', i
  
      def test_feat_1_case_1(self):
          time.sleep(0.5)
  
      def test_feat_1_case_2(self):
          time.sleep(0.5)
  
      def test_feat_1_case_3(self):
          time.sleep(0.5)
  
      def test_feat_1_case_4(self):
          for i in xrange(10):
              time.sleep(0.1)
              print 'Few lines %d' % i
  
new_contents: import unittest
  import time
  
  class TestE(unittest.TestCase):
      def test_many_lines(self):
      	for i in xrange(100):
      		print 'Many lines', i
  
      def test_feat_1_case_1(self):
          time.sleep(0.5)
          self.fail('Artificial fail one')
  
      def test_feat_1_case_2(self):
          time.sleep(0.5)
          self.fail('Artificial fail two')
  
      def test_feat_1_case_3(self):
          time.sleep(0.5)
  
      def test_feat_1_case_4(self):
          for i in xrange(10):
              time.sleep(0.1)
              print 'Few lines %d' % i
  
subject: Make some slow tests fail