def test_fib_of_index_5():
assert Fib.calculate(5) == 8
def test_fib_of_index_1():
assert Fib.calculate(0) == 1
def test_fib_of_index_10():
assert Fib.calculate(10) == 89
def test_fib_of_index_6():
assert Fib.calculate(6) == 13
def test_fib_of_index_9():
assert Fib.calculate(9) == 55