def test_four(self, stdout):
     main()
     self.assertEqual(stdout.getvalue(), "\n".join([
         '1 2 3 4 5 6',
     ]) + '\n')
 def test_one(self, stdout):
     main()
     self.assertEqual(stdout.getvalue(), "\n".join([
         '1 2',
     ]) + '\n')
 def test_three(self, stdout):
     main()
     self.assertEqual(stdout.getvalue(), "\n".join([
         '2 1 3',
     ]) + '\n')
 def test_input(self, stdout):
     main()
     self.assertEqual(stdout.getvalue(), "\n".join([
         '3 2 1 4',
     ]) + '\n')