def testcase_2(self):
     assert fibo(10) == 55
 def testcase_1(self):
     assert fibo(1) == 1
 def testcase_4(self):
     assert fibo(20) == 6765
 def testcase_5(self):
     assert fibo(25) == 75025
 def testcase_3(self):
     assert fibo(15) == 610