Tribonacci test

tribonacci_test

import 'dart:async';

void main() async {
  test();
}

void test() {
  expect(tribonacci(0), 0);
  expect(tribonacci(1), 1);
  expect(tribonacci(2), 1);
  expect(tribonacci(3), 2);
  expect(tribonacci(4), 4);
  expect(tribonacci(5), 7);
  expect(tribonacci(6), 13);
  expect(tribonacci(7), 24);
  expect(tribonacci(10), 149);
  expect(tribonacci(15), 3136);
  expect(tribonacci(20), 66012);
}

void expect<T>(T a, T b) {
  if (a == b) {
    print('pass');
  } else {
    print('fail. $a != $b');
  }
}

/// The Tribonacci sequence is a series of numbers in which each number (after the first three) 
/// is the sum of the three preceding ones.
/// It starts with 0, 1, 1. The sequence goes: 0, 1, 1, 2, 4, 7, 13, 24, 44, and so forth.
int tribonacci(int n) {
  return 0;
}