def test_recurse_2(self):
     v = collatz_recurse(9, 1)
     self.assertEqual(v, 20)
 def test_recurse_3(self):
     v = collatz_recurse(999999, 1)
     self.assertEqual(v, 259)
 def test_recurse_1(self):
     v = collatz_recurse(5, 1)
     self.assertEqual(v, 6)