def test_fibonacci_3_digits():
"""The index of the first 3-digit Fibonacci number is 12"""
assert fibonacci_x_digits_index(3) == 12
def test_exception_for_non_integer():
"""Input must be an integer"""
fibonacci_x_digits_index(3.22)
def test_fibonacci_2_digits():
"""The index of the first 2-digit Fibonacci number is 7"""
assert fibonacci_x_digits_index(2) == 7
def test_exception_for_less_than_1():
"""Input must be 1 or greater"""
fibonacci_x_digits_index(0)
